A) Uniform circular motion
B) Elliptical motion
C) Uniform straight line motion
D) Projectile motion
Correct Answer: C
Solution :
Key Idea In uniformly straight line motion there is no friction present. According to Newtons 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 \[a=0\]. \[\therefore \] \[F=ma=0\] 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.
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