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Old Oct 14th 2008, 12:05 PM   #1
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momentum questions!!

A man standing on a (perfect) bathroom scale gets mad and throws his soap very hard, straight downward at the scale. Just before the soap leaves his hand will the scale indicate a weight for the man that is too low, too high or correct?
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Old Oct 14th 2008, 02:52 PM   #2
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When you throw it very hard down, you must act on it with a (relatively) big force. According to Newton's 3. law, the soap is acting on the man with a force that is equal in magnitude but in the opposite direction. The man will be pushed a little bit up by the force from the soap, and therefore the scale will indicate a weight that's too low.

Last edited by Aslak; Oct 14th 2008 at 02:55 PM.
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