Two balls with the same mass, one of wood and the other a ping-pong ball partly filled with sand, are

rolled along a desk. The wooden ball rolls along nicely, but the ping-pong ball stops in a few
centimetres. What happened to its kinetic energy? Was the kinetic energy changed to heat energy
by the force of friction between the ball and the desk? Explain your answer.

Torque in backward direction due to normal in the case of ping-pong ball is more than that of the wooden sphere. 

Also, torque in forward direction due to friction in the case of ping-pong ball is less than that of the wooden sphere. So, ping-pong ball stops very soon. Loss of kinetic energy is changed into heat.

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