Bicycles and cars have ball-bearings because – McqOptions

MCQOPTIONS

1.	Bicycles and cars have ball-bearings because
A.	The actual area of contact between the wheel and axle increases
B.	The effective area of contact between the wheel and axle increases
C.	The effective area of contact between the wheel and axle decreases
D.	neither of the above
Answer» D. neither of the above

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