A) Movement of piston in a cylinder
B) A vehicle speeding
C) Running on a track
D) All of the above
Correct Answer: B
Solution :
Friction is desirable to stop or reduce speed of a speeding vehicle. When the brakes are applied in a speeding vehicle, they rub against the wheels in motion. Due to the friction between the brakes and wheels, the speed of vehicle is reduced or it may come to stop.
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