Gravitation

Gravitation Worksheet-1

1. The acceleration due to gravity on the moon is about …………. of that on the earth.

2. In order that the force of gravitation between two bodies may become noticeable and cause motion, one of the bodies must have an extremely large.......................

3. The weight of an object on the earth is about.............. of its weight on the moon.

4. The weight of an object on the moon is about.....................of its weight on the earth.

5. The value of g on the earth is about...............of that on the moon.

Gravitation Worksheet-2

1. Calculate the force of gravitation due to earth on a ball of 1 kg mass lying on the ground. (Mass of earth = 6 × 10²⁴ kg; Radius of earth = 6.4 × 10³ km; and G = 6.7 × 10^–11 Nm²/Kg²)

A. 9.8 newtons                              B. 10 newtons

C. 9.8 kg                                         D. 9.8 newton meter

Gravitation Worksheet-3

6. When a ball is thrown vertically upwards, it goes through a distance of 19.6 m. Find the initial velocity of the ball and the time taken by it to rise to the highest point. (Acceleration due to gravity, g = 9.8 m/s²)

A. u = 19.6 m/s  t = 2 s                B. u = 9.8 m/s  t = 2 s

C. u = 19.6 m/s  t = 4 s                D. u = 9.8 m/s  t = 4 s

7. A rubber ball is dropped from a height of 20 metres.

(a) Calculate the speed of the ball when it hits the ground.

(b) Calculate the time it takes to fall through this height. (g = 10 m/s²)