Suppose you are standing on a train, both feet together,facing a window. The fro

Question

Suppose you are standing on a train, both feet together,facing a window. The front of the train is to your left. The trainstarts moving forward. To keep from falling, you slide your rightfoot out toward the rear of the train. Explain in terms of torquehow this action keeps you from falling over. Suppose you are standing on a train, both feet together,facing a window. The front of the train is to your left. The trainstarts moving forward. To keep from falling, you slide your rightfoot out toward the rear of the train. Explain in terms of torquehow this action keeps you from falling over.

Explanation / Answer

Take moment about the left leg. When the legs are together there is overturning torque but norestoring torque. When the right leg is stretched,there is a restoring torque ofmagnitude = Force experienced on the right leg * distancebetween the two legs. Initially the distance between the two legs was zero. Sonaturally initially restoring torque was 0. Thus in the 2nd casethe restoring torque is more which balances thebody. Note: Restoring torque balances a body from overturning.

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