Very short answer type Questions (1 mark each)
1. Name the two effects that a force can produce.
2. A football is kicked. What kind of forces act on it at the time of kicking?
3. A force acting on a body does not produce motion in it, but causes a change in its shape. What kind of force is this?
4. Describe the inertia of rest by giving a suitable example.
5. Which has more inertia, a cricket ball or a rubber ball of the same size? Why?
6. Write expression describing the force acting on a body in terms of its momentum.
7. Which law of Newton defines the force?
8. Why is it easier to stop a tennis ball than a cricket ball moving with the same speed?
9. A person kicks a one-kg football to score a goal. When he kicks a one-kg brick, his foot gets hurt. Give a reason for it.
Short answer type questions (2 marks each)
10. Represent a force of 5 N acting along 45° north to east direction graphically.
11. Illustrate with the help of a suitable diagram, (a) point of application of force, (b) line of action of force.
12. The unit of mass is kilogram, while that of weight is newton. Explain.
13. A small boy is trying to push a big rock. Show the various forces acting on the rock. What kinds of forces are acting on the rock?
14. An astronaut is drifting away from his spaceship. How can he return back to his spaceship using only an aerosol spray?
15. When you jump from a certain height, why do you bend your legs rather than keep them rigidly straight?
16. What is impulse? Illustrate the effect of impulse.
17. Why does a rider fall backwards when his horse starts running suddenly?
Short answer type questions (3 marks each)
18. What is the gravitational unit of force? Name the gravitational unit of force in the metric system.
19. Explain (a) inertia of rest, (b) inertia of motion.
20. When a person jumps out of a moving train/bus, keeping his face in the direction of the bus, he falls with his face down. Explain.
21. When you take a long jump on a hard surface, your feet get hurt, but not when you jump on a sandy surface. Explain.
22. On what factors does the inertia of a body depend? Which has more inertia, an empty tin or a tin of the same size filled with sand?
23. Fireman have to brace themselves when aiming a fire-hose on to a fire. Explain.
24. Derive the relationship. F = m (v - u)/t, where each symbol has its usual significance.
25. How can you explain flying of an aeroplane in terms of Newton's laws of motion?
26. Why does a fielder pull his arms back while trying to stop or catch a cricket ball?
27. State the law of conservation of momentum.
28. (a) State Newton's second law of motion.
(b) How does the second law of motion give us a method of measure force?
29. (a) Define momentum of a body.
(b) Prove with the help of IIId law of motion that the total momentum of two bodies is conserved during collision provided no external force acts.
1. Name the two effects that a force can produce.
2. A football is kicked. What kind of forces act on it at the time of kicking?
3. A force acting on a body does not produce motion in it, but causes a change in its shape. What kind of force is this?
4. Describe the inertia of rest by giving a suitable example.
5. Which has more inertia, a cricket ball or a rubber ball of the same size? Why?
6. Write expression describing the force acting on a body in terms of its momentum.
7. Which law of Newton defines the force?
8. Why is it easier to stop a tennis ball than a cricket ball moving with the same speed?
9. A person kicks a one-kg football to score a goal. When he kicks a one-kg brick, his foot gets hurt. Give a reason for it.
Short answer type questions (2 marks each)
10. Represent a force of 5 N acting along 45° north to east direction graphically.
11. Illustrate with the help of a suitable diagram, (a) point of application of force, (b) line of action of force.
12. The unit of mass is kilogram, while that of weight is newton. Explain.
13. A small boy is trying to push a big rock. Show the various forces acting on the rock. What kinds of forces are acting on the rock?
14. An astronaut is drifting away from his spaceship. How can he return back to his spaceship using only an aerosol spray?
15. When you jump from a certain height, why do you bend your legs rather than keep them rigidly straight?
16. What is impulse? Illustrate the effect of impulse.
17. Why does a rider fall backwards when his horse starts running suddenly?
Short answer type questions (3 marks each)
18. What is the gravitational unit of force? Name the gravitational unit of force in the metric system.
19. Explain (a) inertia of rest, (b) inertia of motion.
20. When a person jumps out of a moving train/bus, keeping his face in the direction of the bus, he falls with his face down. Explain.
21. When you take a long jump on a hard surface, your feet get hurt, but not when you jump on a sandy surface. Explain.
22. On what factors does the inertia of a body depend? Which has more inertia, an empty tin or a tin of the same size filled with sand?
23. Fireman have to brace themselves when aiming a fire-hose on to a fire. Explain.
24. Derive the relationship. F = m (v - u)/t, where each symbol has its usual significance.
25. How can you explain flying of an aeroplane in terms of Newton's laws of motion?
26. Why does a fielder pull his arms back while trying to stop or catch a cricket ball?
27. State the law of conservation of momentum.
28. (a) State Newton's second law of motion.
(b) How does the second law of motion give us a method of measure force?
29. (a) Define momentum of a body.
(b) Prove with the help of IIId law of motion that the total momentum of two bodies is conserved during collision provided no external force acts.
