Physics 9 Chapter 3 - Dynamics - 17

Physics 9 Chapter 3 - Dynamics - 17

1. What do the air enclosed in the cavities of materials, with which glass wares are packed, makes them?

a) Hard
b) Spongy
c) Inflexible
d) Soft

2. Upon which of the following momentum of a system depends?

a) (b) Mass
b) (c) Velocity
c) (d) Length
d) (a) Both b and c

3. What is a group of bodies within certain boundaries called?

a) Pulley
b) Gear
c) System
d) None of these

4. What is the system called in which a group of interacting bodies are present on which no external force is acting?

a) Isolable system
b) Lasted system
c) None of these
d) Isolated system

5. If no unbalanced or net force acts on a system, then what will be the effect on its momentum?

a) Increases
b) Remains constant
c) Decreases
d) Wastes

6. Which of the following law states that: “The momentum of an isolated system of two or more than two interacting bodies remains constant”?

a) Newton’s first law of motion
b) Law of Conservation of Momentum
c) Newton’s third law of motion
d) Newton’s second law of motion

7. Before releasing the balloon filled with air, the balloon with air was at rest and hence what will be the initial momentum?

a) Zero
b) 5 Ns
c) 10 Ns
d) Maximum

8. Total momentum of the gun and the bullet after the gun is fired =..................?

a) M V / m v
b) M V x m v
c) M V + m v
d) M V - m v

9. In how many ways, seatbelts are useful?

a) One
b) Three
c) Four
d) Two

10. A body of mass 5 kg is moving with a velocity of 10ms^-1. Find the force required to stop it in 2 seconds?

a) 0 N
b) 50 N
c) 25 N
d) 10 N

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