Question

mention three disadvantages of friction between the parts of a machine.How does a)oiling and b)using ball bearings help reduce friction?​

Answer 1

Answer:

The main disadvantage of friction is that it produces heat in various parts of machines. In this way some useful energy is wasted as heat energy.

Answer 2

1. wear and tear
2. noise
3. heat

• oiling reduces the contact surface so no source to cause much friction
• ball bearings convert sliding to rolling motion between machine parts