Question
Ball bearings are used in bicycles, cars, etc., because
(a) the actual between the is increased area of contact wheel and axle
(b) the effective between the is increased area of contact wheel and axle
(c) the effective between the is reduced area of contact wheel and axle
(d) None of the above statements is correct
Answer:
C
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Explanation:
The correct answer is (c) the effective area of contact between the wheel and axle is reduced.
Ball bearings are used in bicycles, cars, and other machinery because they reduce friction and provide smooth rotation. The use of ball bearings allows the load to be distributed over a larger number of small rolling elements (balls), reducing the area of contact between the wheel and axle. This reduces friction and improves the efficiency of the system.