Question

What are the importance of gravitation

Answer 1

1. Newton's universal law of gravitation explains the attractive force between any two objects which have mass.
2. It explains how we are able to stand on earth, why a body thrown up falls to the ground, why planets revolve around the sun and why the moon revolves around the earth, and so on.
3. This law says that as the distance between two objects increases their force of attraction decreases. This explains why we are not pulled towards a distant star even though it is more massive than the Earth.
4. This law leads to the derivation of an expresion for the acceleration due to gravity...

• With the help of gravitation, we can understand the force experience by various planets , stars etc. with each other.
• This law makes us understand why the planets revolve around the sun and why satellite revolve around the planets.
• Gravitation explains us how the planets are held by the sun and why don't they fall on it.
• It can also explain how tides are formed on earth. (Tides are due to the gravitational forces of the sun and the moon).

Example:

Astronauts reach a distant planet and find it takes eight times as much force to lift objects there than it does on Earth. What is the acceleration due to gravity on this planet?

On this planet the force of gravity is eight times larger. Since the masses of objects are a fundamental property of those objects, they cannot change, that means the value of ​g​ must be eight times larger as well:

`8F_(grav)=m(8g)8F`

`=m(8g)`

The value of ​g​ on Earth is 9.8 m/s2, so 8 × 9.8 m/s2 = 78.4 m/s2.

Answer 2

Gravity is very important to us. We could not live on Earth without it. The sun's gravity keeps Earth in orbit around it, keeping us at a comfortable distance to enjoy the sun's light and warmth. It holds down our atmosphere and the air we need to breathe.