Gravity

Gravity or weight
Gravity is defined as the force of attraction exerted by the earth on a body towards its centre is called force of gravity or weight of the body. It is vector quantity. The SI unit of it is Newton(N).
This relation shows that greater the mass of the heavenly body greater will be the force of gravity given by it. As the gravity increase the weight of a body also increase. Gravity of a heavenly body is inversely proportional to the square of the radius of that heavenly bady.
Effects of gravity
1. We can stand,walk, play and perform other activities freely on the earth due to its gravity.
2. The rivers flow up to down due to the gravity.
3. The earth is covered by the atmosphere.
4. All types of objects thrown upwards return to the earth's surface.

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