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06/01/2021 4:32 pm
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A hammer of mass 500 g, moving at 50 m s-1, strikes a nail. The nail stops the hammer in a very short time of 0.01 s. What is the force of the nail on the hammer?
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06/01/2021 4:35 pm
The force of nail on the hammer,
F = \(\frac{Change\;in\;momentum\;of\;hammer}{Time}\)
F = \(\frac{m(v -u)}{t}\)
= \(\frac{0.50\;kg(0-50 \;ms^{-1})}{0.01\;s}\)
= -2500 N
Minus sign denotes the force exerted by the nail on the hammer is acting in the direction opposite to that of hammer.