Question

give the reasons for following:
1.)Ball bearings are used in machines​

Answer 1

Answer:

Ball -bearing are used in machine to reduce and conver into sliding friction to rolling friction. It is used in the machines to reduce friction, because we all know that rolling friction is smaller than sliding friction and ball-bearings are the things that changes the sliding friction into rolling friction.

Explanation:

Answer 2

Answer:

ball bearing are used in machines.....