what happens when ball hit the ground
Energy changes in case of ball hitting the ground:
1. A falling ball transfers Gravitational PE into KE.
2. When the ball hits the ground, its shape changes and the KE is transferred into Elastic PE.
3. As its shape is restored, the Elastic PE changes back into KE.
4. As the bouncing ball gets higher in the air,KE is transferred back into Gravitational PE.
When the ball bounces back up into the air, it does not go up to the same height at which it started.
With each of the above transfers of energy, some of the energy is wasted as heat.
In stage 1 energy is lost because of air resistance. When the ball collides with the air molecules, both the ball and the air are made a little warmer.
In stage 2 energy is lost when the ball changes its shape and the ball becomes warmer. Stage 2 also loses energy as sound when the ball hits the ground.
Stage 3 loses energy for the same reason as stage 2.
Stage 4 loses energy for the same reason as stage 1.