While polishing a substance if the polishing cloth is pressed hard a considerable amount of heat is developed. Why ?

While polishing a substance if the polishing cloth is pressed hard a c

1.	While polishing a substance if the polishing cloth is pressed hard a considerable amount of heat is developed. Why ?
Answer» SOLUTION :Increase in pressure increases the normal force. Hence force of FRICTION also increases. So, a GREATER AMOUNT of work has to be done against friction while polishing, which in turn generates a a greater amount of HEAT.