(G)The value of G for any pair of masses in the universe is the same.On the other hand its value is independent of the medium in which the masses are placed.This is why the G is called universal gravitational constant.
F=Gm1m2
r^2
If m1 and m2 are unit masses and separated by unit distance, then F=G.
Hence, the universal gravitational constant can be defined as the gravitational force between two unit masses which are separated by a unit distance.
Friday, April 16, 2010
Sunday, April 11, 2010
Explanation of Netwons Law of Gravitation
According to Newton;s Law of Gravitation,- F directly proportional to m1m2 .......(i)
- F directly proportional to 1/r^2 .......(ii)
Combining both equation,
F=G(m1m2)/r^2 where G is universal gravitational constant.[G=6.67*10^-11]
Newton's Universal Law of Gravitation
Newton was able to formulate the universal law of gravitation when he obserbed the motion of the planets around sun.
Statement:Newton's universal law of gravitation states that everybody in this universe attracts other body with a force which is:
Statement:Newton's universal law of gravitation states that everybody in this universe attracts other body with a force which is:
- directly proptional to the product of their masses and
- inversely proptional to the sruare of distances between them.The direction of force is along the line joining the bodies.
Gravitational force
Newton,in 1687, discovered the existence of force between two masses.For example, two people sitting in room,a table and a rock lying in a room,sun and the earth.
The force between two masses is called GRAVITATION FORCE.The gravitational force is attractive.this is each body attracts towards it the other body.this force exists universally among all bodies in universe.
In gravitational force,we talk about the force of attraction between two bodies, out of these bodies, if one body is the earth, the gravitational force is called force of gravity.thus, the force of gravity is special case of the force of gravitation.
When a stone is released from the top of a tower, it falls towards the ground. Similarly, if a vody is thrown upward, its speed slows down.The speed becomes zero when the body reaches certain height.After the maximim height, the body begins falling down.Finally, the body returns to the ground.It implies that the earth attracts every body lying near its surface and on its surface towards its centre.The force of attraction of earth on the bodies lie on its surface is called gravity or force of gravity.
Not only earht but all the planets or heavenly bodies have gravity.the gravity of a body depends upon its mass.The gravity of moon is about 1\6th times the gravity of earth.
The force between two masses is called GRAVITATION FORCE.The gravitational force is attractive.this is each body attracts towards it the other body.this force exists universally among all bodies in universe.
In gravitational force,we talk about the force of attraction between two bodies, out of these bodies, if one body is the earth, the gravitational force is called force of gravity.thus, the force of gravity is special case of the force of gravitation.
When a stone is released from the top of a tower, it falls towards the ground. Similarly, if a vody is thrown upward, its speed slows down.The speed becomes zero when the body reaches certain height.After the maximim height, the body begins falling down.Finally, the body returns to the ground.It implies that the earth attracts every body lying near its surface and on its surface towards its centre.The force of attraction of earth on the bodies lie on its surface is called gravity or force of gravity.
Not only earht but all the planets or heavenly bodies have gravity.the gravity of a body depends upon its mass.The gravity of moon is about 1\6th times the gravity of earth.
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