Force and laws of motion Worksheet-5

Force and laws of motion Worksheet-5

1. What name is given to the product of mass and velocity of a body?

2. Name the physical quantity which is considered to be a measure of the quantity of motion of a body.

3. What is the SI unit of momentum?

4. State whether momentum is scalar or vector.

5. What is the total momentum of the bullet and the gun before firing?

6. Name the physical quantity whose unit is kg.m/s.

7. What will be the momentum of a body of mass ‘m’ which is moving  with a velocity ‘v’ ?

8. What is the usual name of the forces which cannot produce motion in a body but only change its shape?

9. Name the unbalanced force which slows down a moving bicycle when we stop pedaling it.

10. State whether the following statement is true or false :

Unbalanced forces acting on a body change its shape.

11. When a ball is dropped from a height, its speed increases gradually. Name the force which causes this change in speed.

12. Name the property of bodies (or objects) to resist a change in their state of rest or of motion.

13. What is the other name of Newton's first law of motion ?

14. The mass of object A is 6 kg whereas that of another object B is 34 kg. Which of the two objects, A or B, has more inertia ?

15. Name the scientist who gave the laws of motion.

16. State whether force is a scalar or a vector quantity.

17. With which physical quantity should the speed of a running bull be multiplied so as to obtain its momentum ?

18. Explain why, it is easier to stop a tennis ball than a cricket ball moving with the same speed.

19. Explain the meaning of the following equation :

p = m × v

where symbols have their usual meanings.

20. Explain how, a karate player can break a pile of tiles with a single blow of his hand.

Answer:

1. Momentum

2. Momentum

3. –

4. Vector

5. Zero

6. Momentum

7. mv

8. Balanced forces

9. Force of friction

10. false

11. Force of gravity

12. Inertia

13. Galileo’s law of inertia

14. B

15. Newton

16. Vector

17. Mass (of bull)

18. Mass of tennis ball is less than that of cricket ball.

19. –

20. The player strikes the tiles with his hand very fast that produces very large momentum.