Usability Testing of Learning Physics Website Benyamin Bode Rumimbo A Final Project for EDC 385 G (Fall 2011) Design and Strategies for New Media Instructor: Dr. Min Liu Contents Introduction ............................................................................................................................................... 3 The physics learning websites ........................................................................................................ 4 The 3I Design ....................................................................................................................................... 5 Criteria for choosing the websites ................................................................................................. 6 Description of the chosen websites ............................................................................................... 7 1. http://www.animations.physics.unsw.edu.au/ .................................................................. 7 2. http://www.physicsclassroom.com/.................................................................................... 9 3. http://phet.colorado.edu/en/simulations/category/physics........................................ 10 Methodology ............................................................................................................................................ 11 Users ..................................................................................................................................................... 11 Setting ................................................................................................................................................... 11 Data and Results .................................................................................................................................... 13 Pre-Test Questionnaire ................................................................................................................... 13 The Test of Physclips Website .................................................................................................... 13 The Test of the Physics Classroom Website ............................................................................ 15 The Test of PhET Website ............................................................................................................. 16 Findings and discussion ....................................................................................................................... 18 Information Design ............................................................................................................................ 18 Interface Design ................................................................................................................................. 23 Interaction Design.............................................................................................................................. 25 Summary and Recommendation ......................................................................................................... 26 Summary ............................................................................................................................................... 26 Recommendation ................................................................................................................................ 27 References ............................................................................................................................................... 28 Appendix .................................................................................................................................................. 29 Pre-Test Questionnaire ................................................................................................................... 29 Post –test Questionnaire ................................................................................................................ 31 Task (Scenario) .................................................................................................................................. 33 2 Introduction Utilizing Information Technology (IT) especially websites as an alternative way to make learning process for science learners more effective, more enjoyable, and easier has become big expectations of science education toward IT world. The reasons behind this hope range from the fact that the information technology can overcome constraint in place, time, cost, and resources to the more pedagogical reasons such as involving website that is designed carefully based on pedagogical aspect can make students’ learning experiences become more productive. (Hargis, 2001) In physics education, there are numerous amounts of websites that are available for students for their online learning activity. The qualities of these websites vary in term of the physics content and the usability design. The goal of this paper is to explore the usability quality of the chosen websites from user perspective that is the usability design of the websites. The main question for this study is: What is students’ perception regarding the design of the chosen websites? In this case the author wants to answer particular question such as: 1. Does the design of the websites make the websites easy to be navigated? 2. Does the information provided in the websites easy to be understood? 3. Do the users think that the web sites will help them with their study? 4. What feature(s) do students like most? 5. What feature(s) do students not like? 6. What are the users’ suggestions for the improvement of the websites? 3 The physics learning websites Building conceptual understanding based on direct observations is one of the most recommended instructions that reported extensively in the literature of physics teaching research. In classical physics instructions, direct observations are mostly designed to verify formulas or principles in physics. Researchers found that focusing on this goal only empowers students to memorize physics formulas and concepts as facts without understanding the real phenomena. Furthermore, students will not be able to understand the connection between physics concepts and the real applications. Therefore, expert teachers suggest that in order for students to be able to build conceptual understanding, the focus of direct observation in class or in laboratory should be shifted toward challenging student beliefs, testing students’ reasoning and helping students to build scientific conceptions (Hunt & Minstrell, 1994). In short, the teaching of physics which aims to promote conceptual understanding should focus on engaging students in the scientific processes that mirror how scientists generate knowledge. One primary condition for a good learning physics website should be based on the ability of the website to provide an environment in which students can be engaged in scientific activity that will promote conceptual understanding. Advances in the information technology world, especially in the field of internet together with the development in multimedia production, seems to have a very promising answer to the struggle of providing better science teaching for students. The ability to embed designed-carefully animations, simulations or virtual labs on the learning physics websites can help students to capture conceptual understanding of physics concept. 4 The 3I Design From a universal design perspective, a well-designed website should be built upon good information design, good interface design, and good interactive design, or what we call 3I design (information, interactive, and interface design). For a learning website, information design is about how the content is organized, interface design is about how the navigation tools for the websites are designed and provided to deliver the content, and interaction design is about how the learning experiences-the interaction between the user and the website-are designed. The ultimate goal of this 3I design is not only to make the information can be captured by users/students, but also to present the website as an enjoyable source of learning for students. Good information design requires categories such as organization, accuracy, relevance, and clarity. The main point of this aspect is to provide organized, meaningful, and clear information for users. Shedroff(1994) explained that providing valuable, compelling, and empowering information is an important skill that one should have in this digital era information. It is clear that valuable, empowering, and compelling information will only come from organized, clear, and relevant information. This purpose is served by information design. To organize information means to reveal the meaning of the information by putting it in a particular context, presenting it in a categorical way, and introducing the similarities, differences, causalities or other connections among them. The accuracy of the information shows the ability of the information to tell the truth or show the reality. The relevance of information is related to the meaningfulness of the information in the context of how the user will use the information. Clarity means that the information leaves only one way to be understood by users. 5 A good interface design is related to the availability of appropriate tools for users to utilize the product. Website tools that are prepared for users include menus, buttons, dialog boxes, and other navigation tools. In presenting these tools for users, categories such as simplicity, consistency, and aesthetics need to be followed by the designers in order to maximize the functionality of these interface tools. Interaction design is about how to design meaningful and enjoyable communication between users and the products. This meaningful communication rests on how much control or power users have in using the websites or how much flexibility users have in using the websites. Example of control or power that are provided for users in an educational are the possibility for user to choose or to skip particular topics during learning process, the availability of meaningful feedback, and the assurance of safe exploration that will allow users to explore the website freely. Criteria for choosing the websites There are a vast numbers of websites that can be used as resources for physics learning activity. The Google search engine lists hundreds of websites under keywords “physics learning websites”. For this study, the author chooses three physics learning websites that seem to promote conceptual understanding for students. For this purpose, five criteria are established: 1) The chosen websites should incorporate multimedia presentations, such as virtual demonstration or physics animations, to explain mechanics concepts. 6 2) The chosen websites should cover all mechanics contents for high school and that of the first and second year of college. 3) The websites should have an emphasis on the mastery of concepts in mechanics. 4) The websites are especially designed for students and not for general audiences. The content of the websites reflect the content of physics curriculum. 5) The websites are free of charge. Description of the chosen websites 1. http://www.animations.physics.unsw.edu.au/ Picture 1. Physclips homepage 7 Physclips belongs to School of Physics, the University of New South Wales Australia. This website contains physics animations, film clips, interactive physics tutorials, and a large number of links to various resources that aim to help students to learn physics via internet. This website has three main sections that are fully developed and one section that has not been fully developed yet. The three sections that are already fully developed are Mechanics (Volume I), Wave and Sound (Volume II ) and Relativity. The section that has not fully developed yet is Electricity and Magnetism (Volume III). Each of the section contains several concepts and sub concepts where students can freely to choose which concept or sub concept that they are going to learn. For the fully developed section each sub concept is presented in a multimedia presentation where student can hear the explanation of the concept and watch the demonstration of the concept at the same time. For student convenient the website also enable download feature, so that students can download video presentations and watch them offline. In addition to that, links to other web resources that discuss the concept deeper and broader are also provided. Concept and sub concept Picture 2. Volume II (Wave and Sound) 8 Concept and sub concept serve as menus. Each sub concept is explained by using a multimedia that will appear in the main screen when user hits the play button. 2. http://www.physicsclassroom.com/ This website was originally developed for physics students at Glenbrook South High School in Glenview, Illinois, but now it is also popular among college student, especially first and second year students. The website’s main menus are Physics Tutorial, Mind On Physics, The Calculator Pad, Multimedia Studios, Shockwave Studios, The Review Session, Physics Help, Curriculum Corner, The Laboratory and The Photo Gallery. The Physics Tutorial, Multimedia Physics Studio, ans Shockwave Physics Studio are sections that are developed to help student learn physics concept by reviewing static text, or watching multimedia presentation. In term of coverage content, this website covers almost all physics content in general physics curriculum, this means that website covers all content physics for high school and that of college first and second year. Picture 3. The Physics Classroom home page 9 The next four section which are The Calculator Pad, The Review Session, Physics Help, and Mind on Physics are designed for students for doing practice test and see if they can apply concepts that they have learned. The rest three sections Curriculum Corner, Photo Gallery and The Laboratory are sections that are designed for teachers. These sections provide manual and resources to physics teachers on how to adopt the content of this website to their classroom activities. 3. http://phet.colorado.edu/en/simulations/category/physics This website hosts a collection of science simulation. The Physics Education Technology (PhET) website is initially developed to host useful simulations for teaching and learning physics. Now the website already expands the scope of its content to math and other branches of science (chemistry, biology, earth science). The website sites that all simulations that can be found here all research based simulation. Furthermore, the simulations are animated, interactive, and game-like environments in which students learn through exploration. The main goal of the presentations on this site is to help students see the connections between real-life phenomena and the underlying science concept. The physics topics that are covered by this site are (1) motion, (2) sound & wave, (3) work, energy & power, (4) heat & thermodynamics, (5) quantum phenomena, (6) light & radiation, and (7) electricity, magnetism & circuits. In addition to providing ready-to-use simulations for science instructions this website also provides instructional tools such as curriculum and guidelines on how to use the simulations in science classrooms. 10 Picture 4. The Phet interactive simulations home page Methodology Users There are three users that participated in this study. All of them are students at the University of Texas at Austin. Two of them are male third-year undergraduate, 20 and 21 years old, majoring in mechanical engineering. Both of them are familiar with physics concept for first and second grade college students. The third is a female second-year graduate student, majoring in science education with a bachelor’s degree in physics. Setting All 3 participants completed the study at the University of Texas at Austin using a prepared computer. 11 Each session was conducted one at a time. Each participant used the same laptop. Before the test, all participants were informed that the main purpose of the test was to test the usability of the websites and not to test their performance. They also were assured that all of the information that they gave would only be used for the purpose of the test and would not be shared with anyone except the professor and the classmates. The test began with participant’s filling-up the pre-questionnaire (see appendix). After the pretest, the researcher showed the user the website and asked the user to explore the website for about two minutes before the user was asked two questions related to their first impression of the website. The first question was to ask the user what the purpose of the website was and the second question was to ask the user’s opinion about the appearance of the website. The second task was to complete two specific questions and one open ended question. While going through these tasks the participants were asked to thinkaloud so that the researcher could track what the users were thinking while completing the task. At the end, the last task was to complete the post– questionnaire test. 12 Data and Results Pre-Test Questionnaire Aspect User A User B User C Gender Age Current Education/Major Male 21 Mechanical Engineering N/A Male 22 Mechanical Engineering N/A Female 26 Science Education Physics 5 7 5 6 10 6 5 7 Blackboard Khan Academy YouTube 5 6 Blackboard Khan Academy YouTube 10 6 Blackboard Online course Physclips Physiclips The Physcis classroom Degree completed Hours/day using computer For school/work For Private Hours/day using internet For school/work For Private Previous experience with learning websites ( including learning any skills/knowledge from websites) Website tested The Physics PhET Colorado PhET Classroom Colorado The Test of Physclips Website Both users were able to complete the two given specific tasks and the openended task in the test of the Physclips website. Both of them were able to find the right page for the specific task #2 and for task #3. The users also could show more than three pages that answered the open ended task. However, finding this information, especially the pages for task #3 was not free from trial and error. During the test one of the participants went to open several different pages before he decided the one that was suitable for task #3. 13 The results of the post-test questionnaire measuring the level of satisfaction of the users after using the Physclips website are shown below. In the following table, a scale 1 to 5 is used in which 5 means the user was very satisfied. Aspect of evaluation User A User B Quality of information 4 5 Relevance of information 4 5 Ease of navigation 4 4 Ease of finding specific information 4 4 Clarity of language 4 4 Quality of graphics and animations 4 4 Usefulness of graphics and animations 4 4 Ease of working with tools 3 4 Quality of instructions 4 4 Overall learning experience 4 4 Fun value 3 4 4 4 Overall appearance, including colors, and fonts. How likely are you to return to this website on your own? A/B Highly unlikely 0 1 2 3 4 5 Very likely When the users were asked what feature(s) they liked most, one of the users said he liked the animations and the other mentioned the movie-like presentation. When asked what features of the website they didn’t like, both of 14 the users mentioned that they didn’t like that the website did not immediately display the presentation after they clicked the corresponding menu. In fact, the website took time to load the video presentation after the user clicked a certain menu. The Test of the Physics Classroom Website On this test, both users were also able to complete the given two specific tasks and the open-ended task. However, in this site, users took more time to complete the task. Both of them were able to find the right page in less than four minutes in each of the specific tasks. On the open ended task, the users were also able to complete the task in the given time. The result of the post-test questionnaire for this website is shown below. In the table a scale of 1 to 5 is using in which 5 means the user was very satisfied. Aspect of evaluation User A User C Quality of information 3 4 Relevance of information 4 5 Ease of navigation 5 4 Ease of finding specific information 4 4 Clarity of language 3 4 Quality of graphics and animations 3 3 Usefulness of graphics and animations 2 3 Ease of working with tools 3 4 Quality of instructions 3 3 Overall learning experience 3 3 15 Fun value Overall appearance, including colors, and fonts. 2 3 3 4 How likely are you to return to this website on your own? Highly unlikely 0 1 2 3 4 5 Very likely When the users were asked what feature(s) that they liked most in this website, one user pointed out that he liked the color and the other had no idea. When they were asked about what feature(s) that they didn’t like, both of the users mentioned that the website was very overwhelming. Some pages are too long and full of text just like in the physics textbook. One of the users mentioned that the quality of the animations were very poor. Most of the animations were have a very small size and moreover, students were not able to connect the animation with the underlined physics concept due to the lack of description of the animation. The Test of PhET Website For this website, one user were not able to complete the specific task #2 but was able to complete task #3 and #4. The other one was able to complete all tasks in the given time. The result of post-test questionnaire for this website is shown below. In the table a scale 1 to 5 is using in which 5 means the user was very satisfied. Aspect of evaluation User B User C 16 Quality of information 4 4 Relevance of information 4 4 Ease of navigation 4 3 Ease of finding specific information 3 3 Clarity of language 3 4 Quality of graphics and animations 4 5 Usefulness of graphics and animations 4 4 Ease of working with tools 4 4 Quality of instructions 4 4 Overall learning experience 4 4 Fun value 4 5 4 4 Overall appearance, including colors, and fonts. How likely are you to return to this website on your own? B Highly unlikely 0 1 2 3 4 C 5 Very likely When the users were asked what feature(s) that they liked most in this website, both users liked that the website provide so much interaction. One user explained that he liked the game-like design of the animations, and the other mentioned that she liked that the website allows student to manipulate physics properties. For example students can adjust how much power they want to exert on an object or in what direction they want to drag the object and immediately the student could see what will happen if that certain change were made. 17 When the users were asked about feature(s) that they didn’t like, both of the users pointed out that the website required them to install every simulation that they want to play. They were worried if they install something into their computer, it would harm their computer. Another thing that both of the users also pointed out was that the page which contains icons for every animation was very crowded, which makes the icons looked smaller. One user also pointed out that she would prefer if the label of every simulation is made more descriptive. She also mentioned that it would be better if the menus are arranged based on physics concept and not alphabetically. Findings and discussion Information Design The test result shows that organization of the information is the most prominent problem that happens in all of the three websites. Organizing information rests in the heart of web design. It’s one of the most important aspects that one should take into account when thinking about designing a website, especially an educational website. Every audience will expect that the information will be presented in a way that familiar to them. Thus, presenting the information in a familiar way to the audience will help them to find the right information without wasting their time wandering all over the website. Providing clue such as links or other interface tools in a visible place will also help users in finding information in the website. The first example of this problem comes from the Physclips website. The website provides the information in two formats: video presentations and static text and links. The first page of the website that discuss mechanics is designed in a long page that only the upper part of the website will appear immediately 18 when a user comes to that page. The problem is the part of the page that appears immediately contains a frame in which a list of video presentations and a box where the video will be presented which is big enough to occupy the whole screen. The presentations look very catchy and most of the audience will not realize that the page is not only containing a list of video presentations but also a lot of information below the box. This information, which is in the hidden area of the page, can only be seen if users scroll down with their mouse. This information that rests in the hidden area of the page will stay useless for most of the users who didn’t scroll their mouse down. Table of contents of video presentations Picture 5. The upper part of the page that will immediately appear 19 Picture 6. The lower part of the page contains links to additional resources. The second example of organization information comes from the physics class room website. This website provides information in a text-book-like format makes users (students) feel overwhelmed. Moreover, the massive text that occupies almost all page in this website, which uses small fonts, single space, and simple animation, gives no contribution to fun experience nor will it engage students in learning physics. Nathan (1994) suggested that the most important factor in presenting information is the clarity of the information. Reducing complexity of the information by chunking large information onto “bite-sized” pieces will contribute to the clarity of information and in turn will help users to easily capture the message in the information. 20 Very small and Simple animation Picture 7. One example page that is taken from physics class room website. The Third example comes from the PhET website. In this website, the list of physics simulations is presented in an alphabetical order. From the designers’ perspective the alphabetical order might be an easy way to organize these huge amounts of simulations in this website. However, this alphabetical order gives no clue to the students on how to find specific information easily because most of the key phrases that are used to describe simulations were not very communicative to be understood by students. This does not necessarily mean that the designer picked inappropriate keywords, but this miscommunication could be due to the lack of audiences’ knowledge to understand the keyword. In order to provide solution for this problem, one of the users suggested that it would be easier for them to recognize each of the simulations if they were organized based on physics concept. 21 Simulation are presented in the alphabetical order Picture 8. Physics simulation front page from PhET website. An example of good information design comes from the Physics Classroom website. This website uses a content list index to facilitate users in finding right page. The content list is arranged based on physics concepts and sub concepts which are very familiar with the students. 22 Content list index is arranged based on physics concept and sub concept that is familiar with students Picture 9. Content list from the physics class room website. Interface Design Problem with interface is mostly related to the use of small fonts together with single space which makes pages look very heavy and dull. This problem occurs in most of the pages of the Physics Classroom website (see picture 7) and in part of the pages of Physclips website (picture 9). In addition to that, limited use of color and shape is also apparent in these three websites which makes the websites lack off an aesthetic view. From the PhET website, the page that contains thumbnails for each simulation is very crowded and the icons for each simulation look very small. In addition to that, keywords that are provided as labels for each simulation give no clear clues about concept that is discussed in the corresponding simulations. In fact, users need more clear description about every simulation so that user will be able to choose which simulations that they are looking for (picture 10) 23 Picture 9. The use of small fonts with single space in Physclips website. Picture 10. The thumbnails that represent each simulation in the PhET website.. 24 Interaction Design At least three problems that are related to interaction design surfaced from this study. The first is problem with interactivity, second is the lack of immediate feedback, and the third is the assurance of safety feeling for user. Problem with interactivity happens in two websites: the Physics Classroom and the Physiclips. These two websites give very limited chance for students to interact actively during learning process. In these websites, students can only watch the presentation and they cannot make prediction, test their idea or applying the process of science. Example of good interactivity comes from the PhET website. This website is designed for students to explore their idea about science topics. Each simulation in this website is designed to provide students chance to learn science in a scientific way. With this simulation, students can make predictions, testing their predictions and draw conclusions. These all are possible because the website offer so much interactivity that is based on the understanding of how users learn science. The second problem with interaction design is the immediate response. This problem emerges from the Physclips website. This website offer presentations in the form of video. Apparently, the videos that are embedded in this website have big capacity, so that every time a student clicks the link to the video, the video will not display immediately but it will take a moment to be loaded to the user’s computer. In a low connection of internet this problem can be even worse. The third problem about the interaction design is the users’ safety feeling. This problem happens in the PhET websites. Animations in this website is designed in that way that every time students click the run button on the animations, a dialog 25 box that asks student to download and a progress bar that looks like the installation progress bar will appear. Even though the download and installation of the animation is temporary most of the students feel unsafe to install the animations on their computer. Summary and Recommendation Summary This study reveals at least two main problems from the perspective of 3I design regarding the design of physics website. The first is problem with organization of information. The need to apply the principle such as chunking content into bite-sized pieces so that users will not be overwhelmed with massive information, providing easy way for users to find the information are the most apparent problem. The second is problem with interactivity. Physics learning website should be designed in a way that would engage student in studying physics concepts. This requires a dynamic interactive between users and the website. Two of the websites in this study offer a very limited interactivity. This makes students become passive participants during learning process. In addition to that, the PhET website shows that the website has a problem with assuring safety feeling for its’ users and the Physclips website has a problem with qick response for its’ videos presentation. 26 Recommendation Based on this study, several points of recommendation for physics learning website are listed as below: Present the content of the web site in a way that familiar to students. For example use familiar physics theme/concepts in organizing the content. Such as Kinematics, Dynamics, Newton’s laws of motion, Energy, etc. Provide a clear description for graph, animation, or simulation so that users will be easily to capture the concepts that are explained in each graph, animation, or simulation. Present picture, graph, or simulation/video in a big-enough size so that students can see the details of the information containing in the picture, graph, or simulation/video. Graphic/video-like contents should not be presented in a competing way with static-text contents. Provide links or clue for students to find information that is not appear immediately in the screen. For example: “scroll down to see more information” Engage students in a learning process by maximizing interactivity of the website trough rich-interactivity animation/simulations. Assure safety feeling of the students (users). If a simulation needs to be installed temporarily on users’ computer, provide information for the users that the installation will not harm their computer and it will be remained only temporarily in the users’ machine. Provide immediate feedback for the users. 27 References Hargis, J. (2001). Can Students Learn Science Using the Internet. Journal of Research on Teaching in Education , 33 (4), 475-487. Hunt, E., & Minstrell, J. (1994). A Cognitive Approach to The Teaching of Physics. In McGilly (Ed.), Classroom Lessons (pp. 511-74). Cambridge, MA: MIT Press. Liu, M., Williams, D., & Pedersen, S. (2002). Allien Rescue: A Problem-Based Hypermedia Learning Environment for Middle School Science. Journal of Technology Systems , 30 (3), 255-270. Mathis, L. (2011). Designed for Use: Create Usable Interfaces. Norman, D. A. (2002). The Design of Everyday Things. New York: NY:Basic Books. Perkins, K., Adams, W., Dubson, M., Fnkelstein, N., Reid, S., & Wieman, C. (2006). PhET: Interactive Simulations for Teaching and Learning Physics. The Physics Teacher , 44, 18-23. Rubin, J., & Chisnell, D. (2008). Handbook of Usability Testing: How to Plan, design, and Conduct Effective Tests (2nd Ed). John Wiley & Sons, Inc. Shedroff, N. (1994). Information Interaction Design: A Unified Field Theory of Design. Retrieved November 23, 2011, from http://www.nathan.com/thoughts/unified/index.html Tidwell, J. (2011). Designing Interfaces. Sebastopol, CA:O': Reilly Media. 28 Appendix Pre-Test Questionnaire User Experiences on Educational Websites – A Study by Benyamin Rumimbo for the Course Designs and Strategies for New Media at the University of Texas at Austin, Fall 2011 Background Questionnaire User ID : __________ Date: __________ Age: __________ Gender: female male 1. Education (please indicate your current level): Undergraduate 1 2 3 4 1 2 3 4 Graduate Current major: ______________________________ Degree(s) completed (if applicable): ______________________________ 2. How many hours per day (approximately) do you use a computer for these certain purposes: a. for school or work? __________hours/day b. for private purposes? __________hours/day 3. How many hours a day (approximately) do you use the internet for these certain purposes: a. for school or work? __________hours/day b. for private purposes? __________hours/day Have you ever visited a learning website? yes no (if no, skip questions 4 and 5) 29 Which instructional or learning website(s) have you visited? (if remembered) ____________________________________________________________ ____________________________________________________________ ____________________________________________________________ ____________________________________________________________ What did you do on the website(s)? ____________________________________________________________ ____________________________________________________________ ____________________________________________________________ ____________________________________________________________ 30 Post –test Questionnaire User ID : __________ Please check in the corresponding box that to indicate the level of your satisfaction after working with this website. 1 means very unsatisfied and 5 means very satisfied Aspect of evaluation 1 2 3 4 5 1 2 3 4 5 6 7 8 9 10 11 Quality of information Relevance of information Ease of navigation Ease of finding specific information Clarity of language Quality of graphics and animations Usefulness of graphics and animations Ease of working with tools Quality of instructions Overall learning experience Fun value Overall appearance, including colors, 12 and fonts. How likely are you to return to this website on your own? Highly unlikely 0 1 2 3 4 5 Very likely Which feature(s) of the website did you like most? ____________________________________________________________ ____________________________________________________________ ____________________________________________________________ ____________________________________________________________ Which feature(s) of the website did you dislike most? ____________________________________________________________ ____________________________________________________________ ____________________________________________________________ ____________________________________________________________ 31 Do you have suggestions for the improvement of the website? ____________________________________________________________ ____________________________________________________________ ____________________________________________________________ ____________________________________________________________ 32 Task (Scenario) Task 1 Take two to three minutes to have a first look at this website. Feel free to explore any part of the website that seems of interest to you. Task 2 to task 4 Say you are taking PHY 301 and now you are at the end of the semester. You will have final exam next week. Today the instructor gave students a list of questions that will help you in reviewing the lessons. Task 2 (Max 4 minutes) One of the questions is to obtain the acceleration of an object in this given condition. The mass of the object is 5 kg and is placed on a horizontal track with k = 0.2 and s = 0.3. A force F = 60 N is exerted horizontal on the object. Now, please go to the website and show me a presentation or a page that discusses the problem. Task 3 (Max 4 minutes) Now suppose the next question that you have in the list requires you to make a graph that shows the change of kinetic and potential energy over time for an object that is dropped from height h. Please go to the website and show me a presentation or a page that can help you with this task. Task 4 (Max 12 minutes) Now, on your own you want to review lessons that cover the relationship between position, velocity and acceleration. Show me at least as many pages as you can that you think discuss this topic. 33