9th Class Unit 5 Notes of Physics

9th Class Unit 5 Notes of Physics, MCQs and Short Questions

Newton’s law of universal gravitation states that everybody in the universe attracts every other body with a force which is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centres.

The Earth attracts a body with a force equal to its weight.

It is assumed that a gravitational field exists all around the Earth due to the gravitational force of attraction of the Earth.

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In the gravitational field of the Earth,

the gravitational force per unit mass is called the gravitational field strength of the Earth. It is 10 N kg-1 near the surface of the Earth.

An object that revolves around a planet is called a satellite.

The moon revolves around the Earth so moon is a natural satellite of the Earth.

Scientists have sent many objects into space. Some of these objects revolve around the Earth. These are called artificial satellites. Next Unit

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