force of friction does not depend upon:
a) weight of obeject in motion
b) nature of surface in contact
c) area of surface in contact
d) external force applied on object
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d(external force applied on object
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ANSWER
c)area of surface in contact
EXPLANATION
Friction does not depend on the amount of surface area in contact between the moving bodies or (within certain limits) on the relative speed of the bodies. It does, however, depend on the magnitude of the forces holding the bodies together.
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