1.

Why is it possible to drive a nail into apiece of wood with a hammer, but it isnot possible to push a nail in by hand?

Answer»

When you swing a hammer you increase its kinetic energy, so that by the time it strikes the nail it imparts a large force which drives the nail into the wood.

The hammer is basically an energy reservoir to which you are adding energy during the course of the swing, and which is released all at once upon impact. This results in the impact force greatly exceeding the maximum force you can exert by just pushing on the nail.



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