Question

An object’s motion is along a circle, but the object’s speed is not constant then motion is
1. relative motion
2. uniform motion
3. non-uniform motion
4. none of these

Answer 1

Correct Answer - Option 3 : non-uniform motion

CONCEPT:

• Non-Uniform circular motion: The motion of the moving body with variable speed and change in the rate of rotation is called Non-uniform motion.
  • ​Examples: Motion of a body on the vertical circle, a man jogging in the park, Oscillation of pendulum, the motion of a train.
  • The object’s velocity vector is always tangent to the circle.
  • The speed and angular speed of the object are not constant.
  • The angular acceleration of the object is not zero.
  • The acceleration vector will not point towards the center of the circle.

EXPLANATION:

• As per the above discussion, as the definition says that in non-uniform motion speed in varying that is it is not constant,

So the correct option will be option 3.

• Difference between uniform and nonuniform motion

Comparison parameters	Uniform motion	Non-Uniform motion
Average speed	The motion is similar to the actual speed of the object.	The motion is different from the actual speed of the object.
Rectilinear Motion	It has zero acceleration.	It has a non-zero acceleration.
Graph	Distance-time graph shows a straight line	Distance-time graph shows a curved line
Distance	Covers equal distances in equal time intervals.	Covers unequal distances in equal time intervals.