Ball bearings is a device which consists of a ring of small metal balls
It reduces friction between the surfaces its rolling on
It works like
Introducing your new favourite teacher - Teachoo Black, at only ₹83 per month
Last updated at June 4, 2020 by Teachoo
Ball bearings is a device which consists of a ring of small metal balls
It reduces friction between the surfaces its rolling on
It works like
Introducing your new favourite teacher - Teachoo Black, at only ₹83 per month