Uniform and Non-uniform Motion MCQs Quiz | Class 9

This Class IX Science quiz covers Unit III: Motion, Force and Work, specifically focusing on Uniform and Non-uniform Motion. The questions address motion along a straight line and identification-based scenarios. Test your understanding of these fundamental concepts, submit your answers to check your score, and download the full solution PDF for your exam preparation.

Overview of Motion

Motion is defined as the change in position of an object with respect to time. In this unit, we focus on motion along a straight line, which is the simplest form of motion. Objects can move in two primary ways: uniformly or non-uniformly.

Uniform Motion

An object is said to be in uniform motion if it covers equal distances in equal intervals of time, no matter how small these time intervals may be. In this type of motion, the speed of the object remains constant.

  • Example: A car moving on a straight, empty highway at a steady speed of 60 km/h.
  • Graph: The distance-time graph for uniform motion is a straight line.

Non-uniform Motion

An object is said to be in non-uniform motion if it covers unequal distances in equal intervals of time or equal distances in unequal intervals of time. In reality, most motions we see around us are non-uniform.

  • Example: A train slowing down as it approaches a station or a car moving through heavy traffic.
  • Graph: The distance-time graph for non-uniform motion is a curved line (non-linear).

Key Differences

Feature Uniform Motion Non-uniform Motion
Distance vs Time Equal distance in equal time Unequal distance in equal time
Speed Constant Variable (Changes)
Acceleration Zero Non-zero

Quick Revision Points

  1. If the speed of a body is changing, it is in non-uniform motion.
  2. Free-falling objects exhibit non-uniform motion because their speed increases due to gravity.
  3. Average speed is calculated to describe the rate of motion for non-uniform motion: Total Distance / Total Time.

Extra Practice Questions

  1. Draw a distance-time graph for a car parked on the side of the road. (Hint: It is a straight line parallel to the time axis).
  2. Why is the motion of a train starting from a station considered non-uniform?
  3. If a cyclist covers 5 meters in every second, what type of motion is this?
  4. Is the motion of the hands of a clock uniform or non-uniform?
  5. Calculate the average speed if an object covers 16m in 4s and another 16m in 2s.