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  • An object of mass 2 kg is sliding with a constant velocity of 4 ms–1 on a frictionless horizontal table. The force required to keep the object moving with the same velocity is (a) 32 N (b) 0 N (c) 2 N (d) 8 N

An object of mass 2 kg is sliding with a constant velocity of 4 ms–1 on a frictionless horizontal table. The force required to keep the object moving with the same velocity is

(a) 32 N
(b) 0 N
(c) 2 N
(d) 8 N

Answers (1)

Ans. b

Sol.

If the object moving with some speed on the frictionless ground, then there is no force which will try to reduce its speed.

We know that friction always opposes the motion and tries to reduce the speed. In presence of friction, an external agent has to apply an equal force in opposite direction to maintain the speed.

As in this question, there is no friction on the floor, the external agent need not apply any force.

The correct answer is option B.

Posted by

Gurleen Kaur

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