opposes relative motion between contact surfaces of the bodies
increases the relative velocity between the bodies
sometimes helps and sometimes opposes the relative motion
A
adds the motion between the bodies
B
opposes relative motion between contact surfaces of the bodies
C
increases the relative velocity between the bodies
D
sometimes helps and sometimes opposes the relative motion
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Solution
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Friction always opposes the relative motion between the two contact surfaces. In result it can either increase or decrease the velocity of the bodies.
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