2nd Edition

ISBN: 9780134601823

Author: ETKINA, Eugenia, Planinšič, G. (gorazd), Van Heuvelen, Alan

Publisher: Pearson,

Concept explainers

The horse pulls the cart and the cart pulls the horse in response as per Newton third law. So the big question is, “Don’t the two forces cancel each other? How does the cart accelerate?”

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Textbook Question

Chapter 4, Problem 39P

* Helge, Steve, and Heidi are sitting on a sled on a slope covered with a hard snow. The sled is stationary. The friends have different suggestions for how to make the sled start moving. Helge If one of us gets off, the sled will start moving:

Steve: We should invite another person to join us, and then the sled will start moving.

Heidi: We should get off the sled, polish the bottom of the sled to make it smoother and sit back down on it. The sled will then start moving.

Comment on the students' suggestions and decide whose reasoning is correct. Explain using physics concepts, including appropriate diagrams, why those who were incorrect said what they did, and indicate what part of their reasoning was correct.

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Chapter 4, Problem 37P

Chapter 4, Problem 40P

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Chapter 4 Solutions

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