Question

Show that P.E of a body is completely converted into kinetic energy during its free fall under gravity.?

Answer 1

a stone at a height has gravitational potential energy due to its raised position. when the stone is made to fall on a nail standing on a wooden piece, the nail begins to penetrate. the reason is that as the stone starts falling, it's potential energy begins to change in kinetic energy. the falling stone now has kinetic energy. when it strikes the nail, stone does wor k on the nail. the kinetic energy of the nail due to which the nail moves into the wooden piece