**Purpose** In this homework activity, you will practice using your developing ideas about how the motion of an object is related to the force acting on it. **Initial Ideas** Imagine that you see your friend coasting toward you on his skateboard along the level sidewalk. (How he started moving is not a concern here.) - From the moment you first see him, it takes 4 seconds for him to reach you. - As he reaches you, you begin to push him in the same direction as his motion, with a constant-strength push. You continue to push in this way, moving with him for 4 seconds, and then you stop pushing. - Your friend continues to move, coasting in the same direction, for an additional 4 seconds. **Diagram Explanation** The diagram shows three stages: 1. Your friend coasting towards you on the skateboard. 2. You pushing your friend in the same direction of his motion. 3. Your friend coasting again after the push. **Question** What do you think the motion of your friend would be like (speeding up, slowing down, or constant speed) during each of the 4-second periods described above? Would they all be the same, or would they be different? Explain your reasoning. (Note: Assume that the skateboard is well lubricated, so that the effects of friction between the parts of the skateboard and between the skateboard and ground can be ignored.)
**Purpose** In this homework activity, you will practice using your developing ideas about how the motion of an object is related to the force acting on it. **Initial Ideas** Imagine that you see your friend coasting toward you on his skateboard along the level sidewalk. (How he started moving is not a concern here.) - From the moment you first see him, it takes 4 seconds for him to reach you. - As he reaches you, you begin to push him in the same direction as his motion, with a constant-strength push. You continue to push in this way, moving with him for 4 seconds, and then you stop pushing. - Your friend continues to move, coasting in the same direction, for an additional 4 seconds. **Diagram Explanation** The diagram shows three stages: 1. Your friend coasting towards you on the skateboard. 2. You pushing your friend in the same direction of his motion. 3. Your friend coasting again after the push. **Question** What do you think the motion of your friend would be like (speeding up, slowing down, or constant speed) during each of the 4-second periods described above? Would they all be the same, or would they be different? Explain your reasoning. (Note: Assume that the skateboard is well lubricated, so that the effects of friction between the parts of the skateboard and between the skateboard and ground can be ignored.)
College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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Transcribed Image Text:**Purpose**
In this homework activity, you will practice using your developing ideas about how the motion of an object is related to the force acting on it.
**Initial Ideas**
Imagine that you see your friend coasting toward you on his skateboard along the level sidewalk. (How he started moving is not a concern here.)
- From the moment you first see him, it takes 4 seconds for him to reach you.
- As he reaches you, you begin to push him in the same direction as his motion, with a constant-strength push. You continue to push in this way, moving with him for 4 seconds, and then you stop pushing.
- Your friend continues to move, coasting in the same direction, for an additional 4 seconds.
**Diagram Explanation**
The diagram shows three stages:
1. Your friend coasting towards you on the skateboard.
2. You pushing your friend in the same direction of his motion.
3. Your friend coasting again after the push.
**Question**
What do you think the motion of your friend would be like (speeding up, slowing down, or constant speed) during each of the 4-second periods described above? Would they all be the same, or would they be different? Explain your reasoning. (Note: Assume that the skateboard is well lubricated, so that the effects of friction between the parts of the skateboard and between the skateboard and ground can be ignored.)
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