- Length
- Mass
- Shape
- Speed

2. A box of mass 20kg is placed on a smooth horizontal surface. Find the acceleration of the box when a 120N force is acting on the box horizontally.

- 6 ms
^{-2} - 5 ms
^{-2} - 4 ms
^{-2} - 7 ms
^{-2}

3. A net force of 30 N causes a block to accelerate at the rate of 6 m/s2. Determine the mass of the block.

- 5 kg
- 6 kg
- 7 kg
- 8 kg

4. A box of mass 5 kg moved with constant velocity when it was acted by a force of 15 N. Find the magnitude of the friction exert on the box.

- 50 N
- 15 N
- 35 N
- 65 N

5. The impulse exerts on an object can be increased by

- increasing the net force acting on the object.
- increasing the time of action of the force on the object.
- putting more mass on the object.

6. A 5N force is applied on an object for 10s. The object accelerates from 2ms-1 to 5 ms-1. Find the impulse exerts on the object.

**Answer**: 50

7. A billiard ball of mass 0.1 kg is stationary on a smooth billiard table. An impulse of 3.0 Ns is given to the ball horizontally. What is the velocity of the ball after the impact?

**Answer**: 30

8. A car of mass 1500kg was traveling at 50 m/s before it collided with a tree and stopped. If the time of collision was 0.05 seconds, find the magnitude of the impulsive force acted on the car during the accident.

**Answer**: 1500000

9. An astronaut found that his weight is lower on the surface of moon compare with on the surface of the earth. This is due to

- His mass decreases when he reaches at the moon.
- The gravitational field strength on the surface of the moon is lower than on the surface of the earth.
- There is no gravitational force on the surface of the moon.

10. The gravitational field strength on the Moon is about 6 times less than that on the earth. If the weight of a man is 820N on the earth, what will be his weight on the Moon?

- 137N
- 82N
- 4920N