Sci & Tech - NCERT Summary
Quick practice
Question 1 of 5
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 reduced
C
None of the statements is correct
D
The effective area of contact between the wheel and axle is increased
Concepts
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