Force and Motion Quiz - CBSE Class 9 Science

Free practice quiz: Force and Motion (CBSE Class 9 Science). 20 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

Sample questions

1. What is force in scientific terms?

   1. A push or pull
   2. A movement
   3. An energy
   4. A static position
   Show answer

   Answer: A. A push or pull

   Force is defined as a push or pull acting upon an object as a result of its interaction with another object.

2. What is the formula for calculating force?

   1. Force = Mass x Acceleration
   2. Force = Mass / Acceleration
   3. Force = Acceleration / Mass
   4. Force = Mass + Acceleration
   Show answer

   Answer: A. Force = Mass x Acceleration

   According to Newton's Second Law, force equals mass times acceleration (F = ma).

3. If two forces of magnitude 5 N and 10 N act in opposite directions on an object, what is the net force?

   1. 15 N
   2. 5 N
   3. 10 N
   4. 0 N
   Show answer

   Answer: B. 5 N

   The net force is calculated by subtracting the smaller force from the larger force (10 N - 5 N = 5 N) since they are in opposite directions.

4. If you double the mass of an object with constant force, what happens to the acceleration?

   1. Quadruples
   2. Halves
   3. Doubles
   4. Remains unchanged
   Show answer

   Answer: B. Halves

   According to F = ma, if mass is doubled and force remains constant, acceleration must halve to balance the equation.

5. If an object's velocity and force are in opposite directions, what happens to the object's speed?

   1. It increases
   2. It decreases
   3. It remains constant
   4. It is unpredictable
   Show answer

   Answer: B. It decreases

   When the force is opposite to the direction of velocity, it results in deceleration, hence decreasing the object's speed.

Browse all Force and Laws of Motion quizzes