gs1easy
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 statements is correct
▶ Answer & Explanation
Correct answer: C. The effective area of contact between the wheel and axle is reduced
Ball bearings replace sliding friction with rolling friction. Rolling friction is significantly less than sliding friction. By incorporating ball bearings, the area of contact that is effectively 'sliding' is reduced, thereby decreasing the frictional force and making it easier to move the object.
Source: UPSC gs1 2013