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Which of the following best describes an object moving with non-uniform motion?
An object moving with constant velocity
An object covering equal distances in equal intervals of time
An object moving in a straight line with constant speed
An object whose speed changes with time
An object whose speed changes with time
Non-uniform motion is defined as the motion of an object where the velocity changes over time. An object is said to have non-uniform motion if it covers unequal distances in equal intervals of time or if its speed and/or direction varies.
Non-uniform motion is defined as the motion of an object where the velocity changes over time. An object is said to have non-uniform motion if it covers unequal distances in equal intervals of time or if its speed and/or direction varies.
A car driving through city traffic is in non-uniform motion because it frequently stops, accelerates, and slows down due to signals and other vehicles.
v=dtdsтАЛ тАФ definition of instantaneous velocity
a=dtdvтАЛ тАФ definition of acceleration showing change in velocity
In physics, motion is described by the rate of change of displacement. If the velocity vector v is not constant, the acceleration a is non-zero, satisfying the condition a=dtdvтАЛюАа=0. This indicates that the object is either speeding up, slowing down, or changing its direction of motion.
Uniform motion occurs when velocity remains constant (acceleration is zero).
Non-uniform motion implies the presence of net force acting on the body according to Newton's Second Law.
A body moving in a circular path at a constant speed exhibits non-uniform motion because its direction changes continuously.
Motion of a freely falling object under gravity
A bus accelerating from a bus stop
| Feature | Uniform Motion | Non-uniform Motion |
|---|---|---|
Distance covered in equal time | Equal distance | Unequal distance |
In uniform motion, the distance-time graph is a straight line, whereas in non-uniform motion, it is a curve.
Option A, B, and C describe states of uniform motion where velocity or speed remains constant relative to time.
D is correct тАФ An object whose speed changes with time experiences non-uniform motion as it fails to maintain a constant rate of displacement.
Remember that uniform circular motion is a special case where speed is constant but velocity is non-uniform because the direction changes; always check if direction is fixed in motion problems.