Ball bearings are used in bicycles, cars, etc., because –
✓ Correct answer: c) the effective area of contact between the wheel and axle is reduced
ExplanationBall bearings are used to reduce friction between the surfaces.A ball bearing is a specific kind of rolling-element bearing that uses balls to keep the bearing races apart.A ball bearing’s main functions are to support radial and axial loads and lessen rotational friction.In order to reduce friction between surfaces and also because the effective area of contact between the wheel and axle is reduced, ball bearings are used in bicycles, vehicle axles, etc. 191
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