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

Haryana PMTHaryana PMT 2007Laws of Motion

Solution:

According to Newton's second law 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 = m $
$a = 0$
ie, 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.