CBSE Class 9 Science How Forces Affect Motion (Class 9 NCERT New) Quiz 5

1. If a force of 26 N is exerted on two balls, one with a mass of 0.52 kg and the other with a mass of 0.78 kg, which ball will have the greater acceleration? (F=ma)

A The one with a mass of .78 kg will have the greatest acceleration. B The one with a mass of .52 kg will have the greatest acceleration. C They will both accelerate at the same rate.

2. A 20 kg bike accelerates at 10 m/s2. what was the force?

A 25 Newtons B 20 Newtons C 200 Newtons D 10 Newtons

3. Unit of mass

A m/s 2 B m/s C newtons D kg

4. If net force acting on object is 0, then the force is considered to be..

A Balanced B Unbalanced C Equal in Direction D Distance/Time

5. The total momentum before a collision is _________ the total momentum after a collision.

A equal to B less than C more than D It depends on the type of collision

6. Which of the following is the weakest force in nature?

A Electromagnetic force B Strong nuclear force C Weak nuclear force D Gravitational force

7. The strong nuclear force holds together:

A Atoms and molecules B Protons and neutrons in the nucleus C Planets and stars D Electrons and protons

8. Field forces act:

A Only when objects touch B Only when friction is present C Without direct contact D Only in liquids

9. Why don't we experience the strong and weak nuclear forces directly?

A Because they are too weak B Because they act over very short distances C Because they act only in space D Because they cancel each other

10. What happens when forces are balanced?

A The object moves faster B The object changes direction C There is no change in motion D The object stops immediately