Sci & Tech - NCERT Summary
Quick practice
Question 1 of 5
Ball bearings are used in bicycles, cars, etc., because__:
A
None of the statements is correct
B
The actual area of contact between the wheel and axle is increased
C
The effective area of contact between the wheel and axle is increased
D
The effective area of contact between the wheel and axle is reduced
Concepts
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