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  4. Which motion does not require force to maintain it?

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Q. Which motion does not require force to maintain it?

Delhi UMET/DPMTDelhi UMET/DPMT 2007

Solution:

In uniformly straight line motion there is no friction present.
According to Newtons second Jaw of motion $ F=ma $
When body is moving uniformly along a straight line and there is no force of friction, acceleration/retardation of the body $a = 0$.
$ \therefore F=ma=0 $
i.e., no external force is required.
For accelerated motion, force is necessary. In uniform circular motion, elliptical motion and projectile motion direction of velocity changes due to which force is imposed.