HOW FAR? DISTANCE AND DISPLACEMENT In science, motion is defined as the change in position for a particular time interval. You can then start describing motion with the question, “How far did the object travel?” How far did the object travel? There are actually two ways to answer this question. First is by getting the total length of the path travelled by Example: The dog ran 10m to the east, then 5m to the south, and another 10m to the west. So it has travelled a total of 25 meters. (DRAW) other way is by measuring the distance between the initial position and final position of the object. The dog has travelled The 5 meters to the south. In science, the first measurement gives the distance travelled by the object while the second measurement Adobe file: Here are more illustrations showing the difference between distance travelled (represented by broken lines) by an object and its displacement (represented by continuous lines). Can you give one difference between distance and displacement base on the given examples? When can displacement be equal to zero? Is it possible to get zero displacement? What if the ball, the car, and the dog in the illustration go back to their starting positions, what will happen to their respective distances? How about their displacements? If you answered these questions correctly, then you have most probably understood the difference between distance and Distance refers to the length of the entire path that the object travelled. Displacement refers to the shortest distance between the object’s two positions, like the distance between its point of origin and its point of destination, no matter what When a graph is plotted in terms of the distance travelled by the object and the time it took to cover such distance, the graph can be called distance-time graph. If the graph is plotted in terms of displacement and time, it is called displacement-time graph. Refer to the graph in Figure 7. (adobe) What is the displacement of the object after 2 seconds? What is its displacement after 6 seconds? How will you describe the motion of the object between 0s and 2s, between 2s and 4s, and between 4s and 6s? ACTIVITY: MY HOME TO SCHOOL ROADMAP Objective: In this activity you should be able to make a roadmap that shows how you get to school from your house. PROCEDURE: 1. 2. Devise a way to easily measure distance. Using your measuring device, gather the data that you will need for your roadmap. 3. Make sure that you take down notes of all names of the roads, landmarks, corners, posts, and establishments you pass by. 5. Using your gathered data, draw your houseschool roadmap on a short bond paper. Decide on the most convenient scale to use when you draw your roadmap. 6. Label your roadmap properly, including names of the roads, establishments, etc. Specify also the length of the road. ANSWER THE FF: What is the total length of your travel from your house to your school? What is the total displacement of your travel?