 # Law of Gravitation

## The force of attraction between any two objects having masses is known as Gravitation. It is responsible for keeping the earth and other planets in their orbits. Universal law of gravitation states that in this universe, every mass attracts every other mass towards itself with a force that is directly proportional to the product of magnitude of their masses and inversely proportional to the square of distance between these two masses. Universal law of gravitation is important in holding the atmosphere around the earth, revolution of planets around the sun, formation of tides etc. Acceleration due to gravity is defined as acceleration gained by an object under the influence of gravitational force. It changes as the object is taken above or below the earth’s surface. State of an object when it falls under the influence of gravity is known as free fall. Mass is the total quantity of matter present inside the object. It is the measure of inertia of an object. Weight is the force with which the object is attracted towards the earth. It is a vector quantity and is measured in newton.

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• Q1

Write an expression for the maximum height attained by the body and time taken by it to reach at maximum height when it is thrown vertically upwards with an initial velocity u?

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• Q2

Write an expression for the height covered by body falling freely under gravity from rest, reaches the ground in time t?

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• Q3

What is the importance of law of gravitation?

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##### Answer:

Law of gravitation explained several phenomenons like:

i. Revolution of planet around the sun.

ii. Formation of tides due to moon and the sun.

iii. Force that binds us to the earth.

iv. Holding atmosphere around the earth.

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• Q4

What is the value of universal gravitational constant (G)?

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##### Answer:

The value of gravitational constant is

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• Q5

What is the nature of gravitational force between two masses?

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##### Answer:

Gravitational force is always attractive in nature.

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