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A coin just remains on a disc rotating at 120 r.p.m. when kept at a distance of 1.5 cm from the axis of rotation.

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A coin just remains on a disc rotating at 120 r.p.m. when kept at a distance of 1.5 cm from the axis of rotation. Find the coefficient of friction between the coin and the disc. 

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To find: Coefficient of frictions (µ) 

Formula: mrω2 = µ.m.g 

OR 

rω2 = µg

Calculation: 

 From formula, 

The coeffcient of friction between the coin and disc is 0.2414. 

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