Question

Friction wears out the __________ parts of a machine. (moving / static)

Answer 1

1. Friction between various machine parts comes into action when they are in motion.
2. Due to the constant rubbing or impact of various machine parts with each other, frictional force comes into action.
3. The frictional force developed wears out the moving parts of a machine.
4. Static machine parts don't experience friction because there is no relative motion between them.

Hence, friction wears out the moving parts of a machine.