# NCERT Class 9 Science Solutions: Chapter 10 – Gravitation Part 1 (For CBSE, ICSE, IAS, NET, NRA 2022)

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Question 1:

Q. State the universal law of gravitation

The universal law of gravitation states that every object in the universe attracts every other object with a force called the gravitational force. The force acting between two objects is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers.

For two objects of masses and and the distance between them the force of attraction acting between them is given by the universal law of gravitation as:

Where, is the universal gravitation constant given by:

Question 2:

Q. Write the formula to find the magnitude of the gravitational force between the earth and an object on the surface of the earth.

Suppose the earth is a sphere of mass M and radius R and if an object of mass m is placed on the surface of the earth, then the magnitude of the gravitational force between the body and the earth will be:

Question 1:

Q. what do you by free fall?