Force and Motion Quiz - CBSE Class 9 Science

Free practice quiz: Force and Motion (CBSE Class 9 Science). 19 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

This CBSE Class 9 Science practice quiz has 19 multiple-choice questions on Force and Motion, and 19 of them come with an explanation. Try the 5 sample questions below (tap an option to check yourself), then play the full quiz online. No sign-up needed.

Sample questions

1. What is the unit of force in the International System of Units (SI)?

   1. Newton
   2. Dynamite
   3. Kilogram
   4. Joule
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   Answer: A. Newton

   Force is measured in Newtons (N) in the SI system, named after Sir Isaac Newton, who formulated the laws of motion.

2. If a 10 kg object is subjected to a force of 20 N, what is its acceleration?

   1. 2 m/s²
   2. 0.5 m/s²
   3. 20 m/s²
   4. 10 m/s²
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   Answer: A. 2 m/s²

   Using Newton's second law (F = ma), the acceleration can be calculated as a = F/m. Here, a = 20 N / 10 kg = 2 m/s².

3. What happens to the motion of an object if the net force acting on it is zero?

   1. The object moves with constant velocity
   2. The object accelerates
   3. The object comes to a stop
   4. The object changes direction
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   Answer: A. The object moves with constant velocity

   If the net force is zero, according to Newton's first law, the object continues in its state of motion, which can be at rest or moving with constant velocity.

4. What do we call the force that opposes the motion of an object through a fluid?

   1. Gravity
   2. Friction
   3. Drag
   4. Lift
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   Answer: C. Drag

   Drag is the resistive force that opposes an object's motion through a fluid (liquid or gas).

5. What type of energy is possessed by an object due to its motion?

   1. Potential energy
   2. Kinetic energy
   3. Thermal energy
   4. Chemical energy
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   Answer: B. Kinetic energy

   Kinetic energy is the energy an object possesses due to its motion, calculated as KE = 1/2 mv², where m is mass and v is velocity.

More questions in this quiz

Answers and explanations are in the full quiz.

1. Which of the following is an example of a contact force?
2. What is the effect of force on an object at rest?
3. Which law states that for every action there is an equal and opposite reaction?
4. How does mass affect the inertia of an object?
5. A car accelerates from rest to a speed of 60 m/s in 10 seconds. What is its acceleration?
6. In which situation does work not get done on an object?
7. If two objects collide and stick together, what is this type of collision called?
8. What is acceleration due to gravity at the surface of the Earth?
9. What happens to the momentum of an object if its mass is doubled while keeping the velocity constant?
10. Which of the following statements best defines inertia?
11. If a satellite is in orbit around the Earth, which force is acting on it?
12. If an object travels in a circular path at constant speed, which of the following is true?
13. If two forces of 5 N and 10 N act in opposite directions on an object, what is the net force?
14. What will happen to the kinetic energy of an object if its speed is doubled?

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