Question

1- Why sliding is replaced by Rolling in most of the machines?
2- Give some examples showing replacement of sliding with rolling in machines.​

Answer 1

Answer:

So the machines can work more smoothly and easily ..... Eg in ball bearings of some load carrying and conveyor machines

Answer 2

Answer:

$\large \mapsto \boxed{ \sf \purple{Answers \: Below}}$

1st Answer:

Sliding friction replaced by rolling in machines because the force of rolling friction is less than the force of sliding friction.

2nd Answer:

The use of ball bearings between hubs and the axles of ceiling fans and bicycles.