Take a tennis ball. Release it from a height on a hard ground. You will observe that the ball after striking the ground bounces several times. Answer the following questions :
(a) What is the potential energy and kinetic energy when you release the ball ?
b) Why does the ball bounce back after striking the ground?
(c) From where does the ball get the kinetic energy for motion after striking the ground?
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a) At the moment of releasing it's potential energy is equal to mgh where m= mass of the ball, g= acceleration due to gravity, h= height of the ball from the ground. Kinetic energy at that moment is equal to zero.
b) Before striking the ground it's kinetic energy becomes maximum and it doesn't get totally transformed into other forms of energy during collision and as a result it bounces back by using it's remaining energy.
c) When the ball strikes the ground it exerts a force to the ground and the ground exerts an opposite reaction force on the ball and as a result it gets kinetic energy to bounce back.
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