Class: IX Subject: Physics ASSIGNMENT Ch:03 GRAVITATION |
1. Define: gravitation, gravity and gravitational force. |
2. State the universal law of gravitation and its mathematical form. |
3. In what source is ‘G’ universal? |
4. What happens to the force of attraction between two objects when |
(i) Their mass are halved? (ii) Distance between them is increased to 4 times its previous value. (iii) Distance between them as well as each of the mass is increase to 4 times. |
5. If the distance between two bodies is increased 4 times by what factor should the mass of the bodies be altered so that the gravitational force between them remains the same? |
6. What is the force between two spheres weighing 20 kg each and placed 50 cm apart? |
7. A sphere of mass 40 kg is attracted by another sphere of mass 15 kg when their centers are 0.2 m apart with force of 9.8 x 10-7 |
N. Calculate value of ‘G’. |
8. Find the distance between two stones each of mass 2 kg so that the gravitational force between them is 1N. |
9. Gravitational force between two objects on earth is 2N. What will be the gravitational force between these two objects on the surface of the earth? |
10. Why don’t we see objects in the universe colliding or moving towards each other due to gravitational force? |
11. Why do all objects fall towards the earth? |
12. Give a few examples / applications of the universal law of gravitation. |
13. On what factor [s} does the gravity of a planet depend? |
14. Define ‘G’ and give its value. |
15. Differentiate between ‘g’ and ‘G’. |
16. Define ‘g’ and give its value on the surface of the earth. |
17. Name the factors on which ‘g’ depends. |
18. Calculate the gravitational force between a body of mass 100 kg and the earth. Also calculate the acceleration produced in the body and that in earth. |
19. A body weighs 1 kg on the surface of the moon. If mass of the moon is 7.4 x 10 22 kg and radius of moon is 1740 km. Calculate: |
a. The force acting between the body & the moon. |
b. Acceleration produced in the body |
c. Acceleration produced in moon. |
20. A planet has mass and radius 1/3 of those of earth. Calculate the acceleration due to gravity of the planet and compare it with acceleration due to gravity on earth. If an object has 5 kg mass on earth. Calculate its weight on the planet. |
21. Differentiate between mass & weight of a body. |
22. A ball is thrown vertically upwards with a velocity of 49 m/s. Calculate: |
(I). the max height to which it rises. (ii) Total time it takes to return to surface of the earth. |
23. A stone is released from the top of a tower of height 19.6 m. Calculate the final velocity of a body just before touching the ground. |
24. A stone is thrown vertically upwards with an initial velocity of 40m/s. Find the max height reached by the stone. What is the net displacement and the total distance covered by the stone? [g = 10m/s2] |
25. The object dropped from a height (h) with initial velocity zero strikes the ground with a velocity of 30m/s. How long does it take to reach the ground. Also find h [g = 10m/s2] |
26. The mass of a man is 75 kg. What will be his weight on surface of earth? What will be his weight on surface of moon? |
27. A ball is projected vertically upwards with a certain velocity. What is its acceleration? |
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