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Third Law of Motion Answers

1.Isolate the two objects and consider one at a time. Analyze what forces are acting on each of the objects independent of each other. Only these forces are involved in the acceleration of an object.




2. The walker must push off from the ground with both a downward and backward push to the ground from their feet. The opposite force (forward and upward) is returned back to the person from the ground, so the person walks forward.




3. The equal and opposite forces referred to in Newton's third law of motion are acting on different objects. The horse will pull on the cart and the cart will pull on the horse. The cart will have an unbalanced net force acting on it (if neglecting friction) and would accelerate.



Return to third law of motion lesson.

 

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Editor: Tom Benson
NASA Official: Tom Benson
Last Updated: Jun 12 2014

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