Force and laws of motion Worksheet-2

Force and laws of motion Worksheet-2

1. What is the momentum of a man of mass 75 kg when he walks with a uniform velocity of 2 m/s ?

A. 75 kg.m/s                                  B. 150 kg.m/s

C. 100 kg.m/s                               D. 300 kg.m/s

2. When a toothpaste tube is squeezed, its shape changes. The force responsible for this is an example of :

A. Balanced forces                       B. Centripetal forces

C. Unbalanced forces                  D. Centrifugal forces

3. The inertia of an object tends to cause an object :

A. To increase its speed

B. To decrease its speed

C. To resist a change in its state of motion

D. To decelerate due to friction

4. When we talk of a force acting on a body, it usually means:

A. Electrical force                        B. Balanced force

C. Unbalanced                              D. Nuclear force

5. A passenger in a moving train tosses a coin which falls behind him. This shows that the motion of train is: 

A. Accelerated                               B. Uniform

C. Retarded                                   D. Along circular track

6. ‘When a hanging carpet is beaten with a stick, the dust particles start coming out of it. This phenomenon can be best explained by making use of :

A. Newton’s third law of motion

B. Newton’s law of gravitation

C. Newton’s first law of of motion

D. Newton’s second law of motion

7. A water tanker filled up to two-thirds of its tank with water is running with a uniform speed. When the brakes are suddenly applied, the water in its tank would :

A. Move backward                       B. Move forward

C. Rise upwards                           D. Remain unaffected

8. If we release a magnet held in our hand, it falls to the ground. The force which makes the magnet fall down is an example of :

A. Balanced force                         B. Unbalanced force

C. Magnetic force                         D. Muscular force

9. The inertia of a moving object depends on :

A. Momentum a of the object    B. Speed of the object

C. Mass of the object                   D. Shape of the object

10. When a rubber balloon held between the hands is pressed, its shape changes. This happens because:

A. Balanced forces act on the balloon

B. Unbalanced forces act on the balloon

C. Frictional forces act on the balloon

D. Gravitational forces act on the balloon

Answer Key:

1. B

Explanation: Momentum = mass × velocity = m × v

mass, m = 75 kg

velocity, v = 2 m/s

Putting these values in the  formula,

Momentum = 75 × 2 kg. m/s

          = 150 kg.m/s

2. A

3. C

4. C

5. A

6. C

7. B

8. B

9. C

10. A