Class 8
Chapter 12 Class 8 - Friction


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

How a ball bearing works


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Maninder Singh

CA Maninder Singh is a Chartered Accountant for the past 13 years and a teacher from the past 17 years. He teaches Science, Economics, Accounting and English at Teachoo