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Question

# If the movie "super gorilla" King Kong beats his chest on a frozen frictionless lake, will he go backward? Why?

Solution

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In this problem, we examine if King Kong can move on a frictionless lake if he pounds his chest. When King Kong pounds his chest, the force of his hands on his chest is equal to the reaction force of his chest on his hands. Since the contact time is the same, the net impulse must be $0$. Since the impulse is $0$, King Kong's momentum must be constant. Since he is initially at rest ($0$ speed), he will move backwards on the like.

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