Grade: 8 Quarter 1st I. OBECTIVES Content Standard Performance Standard Learning Competency Knowledge Skills Attitude II. III. IV. CONTENT LEARNING RESOURCES References Other Learning Resources PROCEDURES A. Preparatory Activities B. Motivation C. Activity D. Analysis Subject: Science Week No: 1 Session no. 1 Day: 1 Newton’s three laws of motion. Develop a written plan and implement a “Newton’s Olympics”. Investigate the relationship between the amount of force applied and the mass of the object to the amount of change in the objects motion. S8FE-1a-15 Discuss Balance Forces with vector arrows showing direction of forces. Give the properties of Force that acts on an object. Use the properties of Force to describe an object that has balanced forces. Balanced Forces EASE Physics. Module 10.Lesson 3 Science and Technology IV: Physics Textbook. NISMED.2012. pp.292-296 Science 8 Learner’s Module. Campo, Pia C., et al.2013.pp.4-8. The teacher will show a video on balanced force( stop the video up to balanced force discussion) https://www.youtube.com/watch?v=tS8w-CXJehk What is the video all about? What are the forces acting on the object? In balanced force, are the objects in motion? Group the students into 3, give pictures of the following situations below. Let the students discuss among themselves the condition of the object at rest. Does this mean that there are no forces acting on them? So what causes them to stay in place? Group 1 – Hanging pen Group 2 – Book on top of the table Group 3 – A boy standing still on the floor Let each group select a reporter to discuss the answers on the activity Ask the students the following questions: Group 1, Is the pen at rest or in motion? Are there forces acting on the pen? If Yes, draw the forces. You may use arrows to represent these forces.(The pen is at rest; Yes, refer to the drawing on page 8,figure 5 of the learner’s manual) Prepared by: Goldah S. Catubig Science Coordinator San Jose District E. Abstraction Group 2, Is the book at rest or in motion? Are there forces acting on the book? If Yes, draw the forces acting on the book. Use arrows to represent the forces. (The book is at rest; Yes, refer to the drawing on page 8,figure 5 of the learner’s manual) Group 3, What are the forces present on the boy standing still on the floor? Are the forces equal?(force of gravity, frictional force, and the floor pushes upward on the person;Yes) The teacher will discuss the different properties of Forces. Point of application Direction of the force Line of action --------------------- Line of action ------------------F Force acting on a ball Figure 1 To accurately describe the forces acting on an object, it is important to be familiar with the following terms: magnitude, direction, point of application, line of action. Forces are described in terms of these properties. Magnitude refers to the size or strength of the force. It is commonly expressed in newton (N). Consider the diagram in Figure 1 showing a force, represented by the arrow, acting on a ball. The direction of the arrow indicates the direction of the force while the length of the arrow represents the relative magnitude of the force. If the force applied on the ball is doubled, the length of the arrow is increased two times. The line of action is the straight line passing through the point of application and is parallel to the direction of the force. Tension force Force of gravity I I I I I I I I Line of action Pen Book I I I I I I I I Normal force Force of gravity Prepared by: Goldah S. Catubig Science Coordinator San Jose District F. Application G. Practical Applications of Concepts and Skills in Daily Living H. Generalization I. Evaluation Figure 2. Force diagram The diagram in figure 2 shows the force acting on the a)Pen and b)Book. All objects fall down because gravity pulls on them towards the center of the earth. The pen stays in place because of another force that acts on it that is supplied by the string referred to as tension force (T). The book on the other hand, stays at rest because the upward push exerted on it by the table which we refer to as the normal force (Fn). Both the tension force and the normal force counteract the pull of gravity (Fg) that acts on the object. Group the students into 5, let them give (one) example of balanced force and identify the forces acting on the object. Draw the example and label the forces acting on the object using arrows. Use white cartolina (1/4 size) and crayons to color their work. Criteria: content – 10 Visual impact – 5 15 pts. “Campus Tour” For 15 minutes, let the students move around the campus. Remind the students to be careful of hazardous objects during the tour. Let them identify one object that they see that is on balanced force. Be able to answer the guide questions to be written on student’s journal. 1. Is the object moving? Why or Why not?(No, because the forces acting on the object are equal in magnitude and in opposite directions and they lie along the same line of action) 2. Are there forces acting on the object? Draw the forces using arrows.(Yes, the drawing depends on the students encounter of the different objects around the campus) 1. How are forces described?(Forces are described based on their properties: Magnitude, direction, point of application, line of action) 2. What does the arrow of force indicate? (It indicates the direction of force) 3. In a balanced force, can the object move? Explain your answer.(No, because the forces acting on these objects are balanced) See attachment D. Prepared by: Goldah S. Catubig Science Coordinator San Jose District J. Additional activities for application or remediation (assignment) V. REMARKS VI. REFLECTION No. of learners who earned 80% in the evaluation No. of learners who continue to require remediation Did the remedial lesson work? No. of learners who caught up the lesson No. of learners who require remediation Which of my teaching strategies worked well? Why did these work? “My Trip”. On your way back home, identify at least two objects that you see along the way that is on balanced force. Be ready for an oral presentation the next meeting. Criteria: Content – 10 Delivery – 5 15 pts. What difficulties did I encounter which principal and supervisor can help or solve? What innovation or localized did I use/discover which I wish to share? Prepared by: Goldah S. Catubig Science Coordinator San Jose District ATTACHMENT A (Attachment for Activity: Group 1) Forces on objects at rest Objectives: After performing this activity, you should be able to identify the forces acting on objects at rest. Materials: pen string pair of scissors (be careful with the use of the pair of scissors) Procedure: 1. Hang a pen by a piece of string as shown in the figure below. https://www.google.com/search?q=picture+of+a+pen+cartoon&tbm=isch&ved Q1. Is the pen at rest or in motion? Q2. Are there forces acting on the pen? If yes, draw the forces. You may use arrows to represent these forces. Prepared by: Goldah S. Catubig Science Coordinator San Jose District ATTACHMENT B (Attachment for Activity: Group 2) Forces on objects at rest Objectives: After performing this activity, you should be able to identify the forces acting on objects at rest. Materials: Book Table Procedure: 1. Place the book on top of a table as shown in the figure below. https://www.google.com/search?q=picture+of+a+book+on+the+table&tbm=isch&ved Q1. Is the book at rest or in motion? Q2. Are there forces acting on the book? If yes, draw the forces acting on the book. Prepared by: Goldah S. Catubig Science Coordinator San Jose District ATTACHMENT C (Attachment for Activity: Group 3) Forces on objects at rest Objectives: After performing this activity, you should be able to identify the forces acting on objects at rest. Boy standing still https://www.google.com/search?q=cartoon+picture+of+a+child+standing&tbm=isch&ved Q1. Is the boy in motion? Q2. Are there forces acting on the boy? If Yes, draw the forces. You may use arrows to represent these forces. Prepared by: Goldah S. Catubig Science Coordinator San Jose District ATTACHMENT D Evaluation: Essay. Answer the question for 5 pts. 1. How do you describe an object at rest? Ans. An object is at rest when the forces acting on it are equal in magnitude, in opposite directions and lie along the same line of action, where the forces are balanced. Prepared by: Goldah S. Catubig Science Coordinator San Jose District
