Very short Answer Type (1 Mark)
1. What is force? What are its effects on a body? What is its unit?
2. What are balanced and unbalanced force ?
3. The earth attracts an apple with a force say 1.5 N. If this is the action force, how
much is the reaction force? Who exerts this reaction force? On which body does this
reaction force act?
4. What is the definition of 1 Newton?
5. A man while getting off a moving train is liable to fall. Why ?
6. Give two examples each of situation in which you push or pull to change the state of
motion of objects?
7. Give two example of situation in which applied force cause a change in the shape of
an object?
8. Fill in the blanks in the following statements
(A) To draw water from a well we have ______________ at the rope
(B) A charged body ________an uncharged body towards it..
9. A rocket has been fired upwards to launch a satellite in its orbits. Name the two
forces acting on the rocket immediately after leaving the launching pad.
10. What is the SI unit of momentum?
Short Answer Type (2 Mark)
11. Define linear momentum. What is the condition for the conservation of linear
momentum of a system?
12. What is the difference between mass and weight ?
13. State Newton’s second law of motion.
14. What are causes of sliding(kinetic) friction?
15. What are the ways to reduce friction?
16. What are the disadvantages of friction?
Medium Answer Type (3 Mark)
17. Why do we see an apple falling towards the earth and not the earth towards the
apple?
18. What is Sliding friction?
19. What rolling friction force?
Long Answer Type
20. A body of weight 5N is kept on a horizontal table. Find the force exerted by the table
on the body. Can these forces be called as action and reaction?
21. A man standing on a boat near the shore jumps to it. In which direction will the boat
move ? Explain ?
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