Newton's apple

 

This experiment shows something unusual. An apple fighting gravity and climbing a stick as you hammer the stick. The impact from hammering the stick overcomes the static friction between the apple and the stick that drives the stick down relative to the apple. Kinetic friction brings the apple to a halt and static friction can take over again. As this happens, your hand has been moving the stick back up in time for you to hit it with the hammer again. So, while the stick's net position is unchanged, the apple's has moved upward.

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