Force and pressure Worksheet-10

Force and pressure Worksheet-10

1. Define the term atmospheric pressure.

2. How would 'thrust' on the bottom of a liquid level change if 'area' is doubled keeping the 'pressure' same?

3. Two objects of masses M and 2M are lying on an equal area. Determine the ratio of pressure exerted by them on the ground.

4. When we press the bulb of a dropper with its nozzle kept in water, air in the dropper is seen to escape in the form of bubbles. Once we release the pressure on the bulb, water gets filled in. the dropper. The rise of water in the dropper is due to

(a) Pressure of water.

(b) Gravity of the earth.

(c) Shape of rubber bulb.

(d) Atmospheric pressure.

5. How many objects should be present for a force to come into play?

6. Two friends A and B are applying a force of 2 Newton and 4 Newton on a box in the same direction. What will be the total force applied by them?

7. In a tug of war, side A applies 10 Newton force and side B applies 8 Newton force. Which side will the rope move?

8. What happens to the speed of a body when a force is applied?

9. Can we change the direction of the moving object by applying a force?

10. What is meant by change in state of motion of the object?

11. Is it possible that a force changes the direction of motion but not the speed of an object?

12. Give an example to show that force can change the shape of an object.

13. What is meant by muscular force?

14. A ball is rolled on the ground and it comes to rest after some time even though no force is applied. Why?

15. Does the force of friction also act on the objects moving in the air?

16. Is it essential for the agent applying a force on an object to be in contact?

17. Give one example of a force which can act from a distance.

18. What is meant by electrostatic force?

19. Is the electrostatic force a contact force or non-contact force?

20. What is meant by force of gravitation?

Answer:

1. The pressure exerted by air is known as atmospheric pressure.

2. Thrust will also be doubled.

∴ ratio of pressures is 1 : 2

4. Atmospheric pressure.

5. There should be at least two objects.

6. The total force will be 6 Newton, i.e., the sum of their individual forces.

7. The rope will move towards side A as more force is applied by side A.

8. The speed of a body can be increased or decreased by applying force.

9. Yes,

10. Any change in the speed or direction of motion or both, means a change in state of motion of the object.

11. Yes, it is possible when a body is moving on a circular path.

12. Pressing a rubber ball with the hand.

13. The force resulting due to the action of muscles is known as the muscular force.

14. The ball comes to rest due to the force of friction acting in the opposite direction to the motion of the ball.

15. Yes, air also offers friction to objects moving in air.

16. No, the force can also act from a distance. It is known as non-contact force.

17. Magnetic force, i.e., the force exerted by a magnet on another magnet or a piece of iron.

18. The force exerted by a charged body is known as electrostatic force.

19. It is a non-contact force.

20. The force of attraction exerted by the earth on all objects is called the force of gravitation.