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Frictional force acts in

  • A.The same direction as the motion
  • B.The opposite direction of the motion
  • C.All the directions
  • D.Upward direction

Answer: B

Friction acts opposite to the direction of motion.

It always opposes relative motion, or the tendency to it, between surfaces in contact. That is why it converts kinetic energy to heat and never adds to a body's speed - though it can drive a car forward, because there the tyre's tendency is to slip backwards.

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