Gravitation

Gravitation Worksheet-10

51. Which is more fundamental, the mass of a body or its weight ? Why ?

52. How much is the weight of an object on the moon as compared to its weight on the earth ? Give reason for your answer.

53. (a) Define mass of a body. What is the SI unit of mass ?

(b) Define weight of a body. What is the SI unit of weight ?

(c) What is the relation between mass and weight of a body?

54. (a) State the universal law of gravitation. Name the scientist who gave this law.

(b) Define gravitational constant. What are the units of gravitational constant ?

Gravitation Worksheet-11

71. What is the other name of buoyant force?

72. Name the force which makes heavy objects appear light when immersed in a liquid.

73. What is upthrust?

74. Name the principle which gives the magnitude of buoyant force acting on an object immersed in a liquid.

75. The relative density of mercury is 13.6. what does this statement mean?

76. What name is given to ‘thrust per unit area’ ?

Gravitation Worksheet-12

1. A mug full of water appears light as long as it is under water in the bucket than when it is outside water. Why?

2. What happens to the buoyant force as more and more volume of a solid object is immersed in a liquid? When does the buoyant force become maximum?

3. Why do we feel light on our feet when standing in a swimming pool with water up to our armpits ?

4. Explain why, big boulders can be moved easily by flood.

5. An iron nail sinks in water but it floats in mercury. Why ?

6. Explain why, a piece of glass sinks in water but it floats in mercury.