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.

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.

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