Two ice skaters, Paula and Ricardo, initially at rest, push off from each other. Ricardo weighs more Which skater, if either, has the greater momentum after the push-off? Explain. than Paula. Match the words in the left column to the appropriate blanks in the sentences on the right. Reset He zero Initially, the total momentum of the skaters is since they are at rest. After the push off, non-zero the total momentum Therefore, Ricardo has after the push off. increases decreases remains the same a larger magnitude momentum than Paula a smaller magnitude momentum than Paula the same magnitude momentum as Paula

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Newton’s Third Law of Motion

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?”