GRAVITATION

GRAVITATION

Q 1. Fill in the blanks. (Any 20)                                                                                        (20 Marks)
1. An object going vertically upwards from the surface of the earth, having initial velocity equal to the -------- , escapes the gravitational force of the earth.
2. Gravitational force is the ------- force in the nature.
3. The SI unit of weight is ----------.
4. The SI unit of mass is -------------.
5. When distance between two objects decreases the force of attraction between them ---.
6. The center of a mass of any object hawing uniform density is at its -------.
7. Sir Isaac Newton born in --------------.
8. The orbit of a planet is an ellipse with the Sun at one of the ----------.
9. Sir Isaac Newton gave his laws of motion, equations of motions and theory of gravity in his book ----------.
10. The escape velocity on the earth is -----------.
11. The escape velocity on moon is -----------.
12. The escape velocity is ------- for different planets.
13. The value of acceleration due to gravity is ----- on-----------.
14. The tidal waves in the sea are primarily due to gravitational effect of -------------.
15. When a body is thrown vertically upwards its ------------ is zero.
16. Law of gravitation gives the gravitational force between any -----------------.
17. The energy stored in an object because of its potion or state is called --------------.
18. When a body is dropped freely from a height, it’s -------------- is zero.
19. The acceleration that an object experiences during free fall is -------- of the mass of the object undergoing motion.
20. Free fall, will be a change in the magnitude of --------------- of the object due to the gravitational pull of the earth.
21. Free fall, will be no change in the -------- direction of motion of the object.
22. The motion of any object under the influence of the ----------- alone is called as free fall.
23. The value of acceleration due to gravity is ----.
24. The value of gravitational constant G is --------.
25. Amount of mater present in an object is -------.
26. According to Newton’s first law, mass is the measure of ------- of an object.