Gravitation

Gravitation Worksheet-7

1. A man weighs 600 N on the earth. What is his mass ? (take g = 10 m/s²). If he were taken to the moon, his weight would be 100 N. What is his mass on the moon ? What is the acceleration due to gravity on the moon ? 

2. How much would a 70 kg man weigh on the moon ? What would be his mass on the earth and on the moon ? (Acceleration due gravity on moon = 1.63 m/s²)

3. An object of mass 50 g has a volume of 20 cm³. Calculate the density of the object. If the density of water be 1 g/ cm³, state whether the object will float or sink in water.

4. The relative density of silver is 10.8 If the density of water be 1.0 × 10³ kg m^–3, calculate the density of silver in SI units.

Gravitation Worksheet-8

11. State the kepler’s law which is represented by the relation r³ ∝ T².

12. Which of the Kepler's laws of planetary motion led Newton to establish the inverse-square rule for gravitational force between two bodies ?

13. Name the property of earth which is responsible for extremely small acceleration being produced in it as a result of attraction by other small objects.

14. What is the acceleration produced in a freely falling body of mass 10 kg ? (Neglect air resistance)

15. When an object is dropped from a height, it accelerates and falls down. Name the force which accelerates the object.

Gravitation Worksheet-9

31. (a) What do you mean by the term ‘free fall’ ?

(b) During a free fall, will heavier objects accelerate more than lighter ones?

32. Can we apply Newton's third law to the gravitational force ? Explain your answer.

33. Give reason for the following:

The force of gravitation between two cricket balls is extremely small but that between a cricket ball and the earth is extremely large.

34. Describe how the gravitational force between two objects depends on the distance between them.