Question

Ball bearing is a device which usually converts:
A. rolling friction into sliding friction
B. static friction into sliding friction
C. sliding friction into rolling friction
D. rolling friction into static friction

Answer 1

Answer:

B .static friction into sliding friction

Answer 2

C. sliding friction into rolling friction

Explanation:

Friction is a phenomenon which resists motion when an object is rubbed against another. So friction has instances where it is desired and instances where it is not desired. We also know that rolling friction is much smaller when compared to sliding friction. So in machine parts, we use ball bearings to convert sliding friction to rolling friction in order to reduce friction between moving parts. This reduces heat and wear and tear, and increases the efficiency and life of the machine.

Option C is the answer.