**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.)
Principles of Physics: A Calculus-Based Text
5th Edition
ISBN:9781133104261
Author:Raymond A. Serway, John W. Jewett
Publisher:Raymond A. Serway, John W. Jewett
Chapter5: More Applications Of Newton’s Laws
Section: Chapter Questions
Problem 1CQ: A car is moving forward slowly and is speeding up. A student claims that the car exerts a force on...
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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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