Uniform Circular Motion Questions

The motion of an object along a circular path is called circular motion. It is of two types: uniform circular motion and non-uniform circular motion.

The motion of a body moving with constant speed along a circular path is called uniform circular motion. In non-uniform motion, the rate of rotation keeps changing.

Example: The motion of blades of the windmills.

Read more: Uniform Circular Motion.

Important Uniform Circular Motion Questions with Answers

1. The movement of an object while rotating along a circular path is known as _______

1. Rotatory motion
2. Circular motion
3. Rectilinear motion
4. oscillatory motion

Answer: b) Circular motion

Explanation: In a circular motion, the object/body rotates in a circular path.

2. Choose the correct answer: the motion of a train is the best example of ______

1. Uniform circular motion
2. Non-uniform circular motion

Answer: b) Non-uniform circular motion

Explanation:

3. What would be the distance-time graph of uniform circular motion?

1. Curved line
2. Straight line
3. Semicircle
4. None of the options

Answer: b) Straight line

Explanation: The distance-time graph of uniform circular motion would be a straight line.

4. What are the two components of acceleration of a particle in circular motion?

Two components of the acceleration of a particle in circular motion are:

• Tangential acceleration
• Radial acceleration

5. Kinetic energy of the particle remains constant in which type of motion?

1. Uniform circular motion
2. Non-uniform circular motion

Answer: a) Uniform circular motion

Explanation: In a uniform circular motion, the kinetic energy of the particle remains constant.

6. If a particle is moving in a uniform circular motion ______

1. No tangential acceleration is seen
2. Speed is constant
3. Velocity is changing at every instant
4. All the above options

Answer: d) All the above options

Explanation: Speed remains constant, velocity keeps changing and there is no tangential acceleration seen in the uniform circular motion.

7. From the second law of motion, which equation is correct?

1. F=m+a
2. F=m-a
3. F=ma
4. F=m/a

Answer: c) F=ma

Explanation: F=ma gives the relationship between the mass of the object and the amount of force needed to accelerate.

8. Which among the following has non-zero acceleration.

1. Uniform circular motion
2. Non-uniform circular motion

Answer: b) Non-uniform circular motion

Explanation: Non-uniform circular motion has non-zero acceleration.

9. The instantaneous acceleration in a uniform circular motion is given by _____

1. a = v²-R
2. a = R²/v
3. a = v²+R
4. a = v²/R

Answer: d) a = v²/R

Explanation: a = v²/R gives the instantaneous acceleration in a uniform circular motion.

10. State true or false: Object in a uniform circular motion covers equal distances in equal time intervals.

1. TRUE
2. FALSE

Answer: a) TRUE

Explanation: Equal distance is covered in equal intervals of time in a uniform circular motion.

Practice Questions

1. What is motion?
2. What is uniform circular motion?
3. With an example, explain uniform circular motion.
4. What is angular velocity?
5. If an object is moving in a uniform circular motion, what would be its speed?

Important Questions in the Chapter Motion Class 9

Top 10 NTSE Important Questions on Motion Class 9

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