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Frictional force...

Frictional force

A

always oppose motion of a body

B

always opposes relative motion between the surfaces of contact

C

always in the opposite direction of motion

D

always in the direction of motion

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When brakes are applied in a car,the brake-shoes apply frictional force on the wheels.these forces are internal for the system(car).For retardation,external forces ust act on the system.The force of friction at the road surface remains the same before and after teh brakes are applied (f = mu N) .How does the car stop?

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Out of friction force and viscous force,which depends on velocity?

Using a horizontal force of 200 N, we intend to move a wooden cabinet across a floor with constant velocity. What is the friction force that will be exerted on the cabinet ?

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MODERN PUBLICATION-FORCE AND LAWS OF MOTION-EXAMPLE
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