Which of these is true about friction?
(a) It can stop a moving object.
(b) It can change the shape of an object.
(c) It can change the direction of a moving object.
(d) It can make a moving object move faster.
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Solution
(a) It can stop a moving object.
Friction acts as a decelerating force against motion; it helps in slowing down a body, thereby eventually bringing it to rest.