Gravitation


 
 
Concept Explanation
 

Gravitation

It has been observed that an object dropped from a height falls towards the Earth i.e. earth pulls everything towards itself. Newton generalized this idea and said that not only earth but every object in the universe attracts every other body. This force of attraction between two objects is called the force of gravitation or gravitational force.

Gravitation:

It is defined as the non contact force of attraction between any two bodies in the universe. The earth attracts (or pulls) all objects lying on or near its surface towards its centre. The force with which the earth pulls the objects towards its centre is called gravitational force of the Earth or gravity of the Earth.All the objects in the universe attract each other with a certain amount of force, but in most of the cases, the force is too weak to be observed due to the very large distance of seperation Besides, gravity's range is infinite but the effect become weaker as objects move away.

This force of attraction was first observed by Sir Isaac Newton  and was presented as Newton's law of gravitation in the year 1680. However, gravitation can generally exist in two main instances.

Examples:

  • 1. If  a body(ball) is thrown upwards, it reaches a certain height and falls downwards because of the gravity of the earth.
  • 2. If the moon stopped revolving around the Earth, the mass of the Earth would pull the moon to the Earth.
  • 3.  If there was no larger mass around us, then a pencil would be attracted to our body as our body has a larger mass.
  • 4. As  the moon revolves around the Earth, its gravitational attraction causes the Earth to change the shape just enough to cause the water in the oceans to move in and out forming tides.
  • Sample Questions
    (More Questions for each concept available in Login)
    Question : 1

    The force of _____________________  between two objects is called the force of gravitation or gravitational force.

    Right Option : A
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    Explanation
    Question : 2

    Gravitational Force is an example of _________________.

    Right Option : C
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    Explanation
    Question : 3

    Which of the following is not an example of gravitational force.

    Right Option : D
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    Explanation
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