Q. Which of the following is not true about Frictional force?

A) The force of friction that acts when a body is moving (sliding) on a surface is called sliding friction

B) Friction is the force which opposes the relative motion of two surfaces in contact

C) Rolling friction is much more than sliding friction, the use of ball bearings in a machine considerably reduces friction

D) Friction in machines wastes energy and also causes wear and tear

✔ Correct Answer: Rolling friction is much more than sliding friction, the use of ball bearings in a machine considerably reduces friction

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