Newton's Third Law: Solving the Man & Sled Puzzle

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Homework Help Overview

The discussion revolves around a scenario involving Newton's Third Law, specifically examining the interaction between a man pulling a sled and the forces at play. Participants are exploring how movement occurs despite equal and opposite forces acting on the man and the sled.

Discussion Character

  • Exploratory, Assumption checking, Conceptual clarification

Approaches and Questions Raised

  • Some participants suggest considering Newton's Second Law in relation to the Third Law, while others emphasize the role of friction and the interaction with the ground. Questions about the implications of these forces and the conditions under which movement occurs are raised.

Discussion Status

The discussion is active, with participants providing insights into the mechanics of the situation. There is a focus on the conditions necessary for movement, such as friction and the man's ability to exert force through his feet. No consensus has been reached, but various interpretations and factors are being explored.

Contextual Notes

Participants note the importance of the environment, such as the surface on which the sled is being pulled, which may affect the outcome of the scenario. The interaction with the Earth is also mentioned as a significant factor in the discussion.

brewAP2010
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Homework Statement


If a man pulls forward on a sled, and the sled pulls backward on the man with an equal amount of force, how can the man and sled move at all?


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The Attempt at a Solution

 
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Since the sled will move, you should think about what Newton's 2nd law says compared to his third law. What are your thoughts?
 
brewAP2010 said:
If a man pulls forward on a sled, and the sled pulls backward on the man with an equal amount of force, how can the man and sled move at all?

It is not only man and sled, but there is also the Earth they interact with.

ehild
 
He manages to move the sled by digging in his feet with more resistance than the sled can muster from its friction with the ground. If it were done on ice, he would not need to apply much force.
 

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