Ball bearings are used in bicycles, cars, etc., because (a) the actual area of contact between the wheel and axle is increased
Ball bearings are used in bicycles, cars, etc., because
(a) the actual area of contact between the wheel and axle is increased
(b) the effective area of contact between the wheel and axle is increased
(c) the effective area of contact between the wheel and axle is reduced
(d) None of the above statements is correct
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(c) Ball bearings are used to reduce friction and friction is directly propertional to effective surface area. So if effective surface area is reduced then friction will also reduce.
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