Question

Q8.​No force is required to move a body uniformly along a straight line. Comment.

Answer 1

This is true but only in case of a frictionless surface. We often notice that a ball or a cycle slows down and stops after some time. It is due to the opposing force known as friction applied by the road or the surface beneath. As it is impossible to produce a 100% frictionless surface, the given situation is practically not possible.

hope this helps ......

Answer 2

AnSwer :

The statement is true. When a body is moving uniformly along a straight line and there is no force of friction, acceleration/retardation of the body is zero i.e. a = 0. According to Newton's second law of motion, F = ma = m × 0 = 0.

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Know more :

※ According to second law of motion, the rate of change of linear momentum of a body is directly proportional to the external force applied on the body and this change takes place always in the direction of the applied force.

※ No force is required to move a body uniformly along a straight line. An accelerated motion is always due to some external force acting on the body.

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