Class 9 Science Chapter 10 Gravitation Extra questions for practice

Question 1 - Calculate the force of gravitation between the earth and the sun given mass of the earth = 6x10^24 and the sun = 2x10^30. The average distance between the two is 1.5x10^11.

Answer- 

Question 2 - 

What do you mean by Gravitation?

Answer - The force of attraction between two bodies is known as Gravitation.

Question 3- 

Write the SI unit of G.

Answer - Nm^2kg^2

Question 4 -

Which force is holding the universe?

Answer - Gravitational force

Question 5 - 

Which force is responsible of forming tides in seas and ocean?

Answer - Gravitational force

Question 6 -

With what velocity must be a ball be thrown vertically upward in order to rise to a height of 20m. How long will it be in air.

Answer - 

Question 7 -

A ball is dropped from the top of tower 40m high. What is its velocity, when it has covered 20m? What would be it's velocity just before it hits the ground (g = 10ms^2)

Answer -