Question

16. Give reasons :

(ii) Compressed and purified air is considered a good lubricant.

(iii) We use ball bearings in shafts of motors.​

Answer 1

Answer:

iii. it is used to reduce the friction

ii. it reduces the friction

Answer 2

1: In the machines, the flow of compressed and purified air lowers the friction, hence it acts as a lubricant.

2: The purpose of a ball bearing is to reduce rotational friction and support radial and axial loads. ... In most applications, one race is stationary and the other is attached to the rotating assembly (e.g., a hub or shaft). As one of the bearing races rotates it causes the balls to rotate as well.