What does friction cause to the screws, ball bearings and soles of the – McqOptions

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1.	What does friction cause to the screws, ball bearings and soles of the shoes?
A.	Friction has no effect on these
B.	Friction protects all these
C.	Friction avoids all the damages that could be caused to these due to other forces.
D.	Friction wears out these materials and damages them
Answer» E.

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