Newton, in 1687, discovered the existence of a force between two masses.For example,two people sitting in a room, a table and a rock lying in a room, the sun and the earth, the earth ans the moon and so on exert force on each other.The force between two masses is called gravitational force. The gravitational force is always attractive. That is each body (or mass) attracts towards if the other body (or mass).This force exists universally among all bodies in the 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 the special case of the force of gravitation.When a stone is released from the top of tower, it falls towards the ground.Similarly, if a body thrown upward, its speed slows down. The speed becomes zero when the body reaches a certain height, the body returns to the ground. Tf a stone is released at the top of a deep well, it goes into the earth. This implies that the earth attracts every body lying near its surface and on its surface towards its centre. The force of attraction of the earth on the bodies which lie on its surface(or near its surface) is called gravity or force of gravity.
Not only the earth but also all the planets or other heavenly bodies have gravity.The gravity of a body depends upon its mass. The gravity of the moon is about 1by6 times the gravity of the earth.
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 the special case of the force of gravitation.When a stone is released from the top of tower, it falls towards the ground.Similarly, if a body thrown upward, its speed slows down. The speed becomes zero when the body reaches a certain height, the body returns to the ground. Tf a stone is released at the top of a deep well, it goes into the earth. This implies that the earth attracts every body lying near its surface and on its surface towards its centre. The force of attraction of the earth on the bodies which lie on its surface(or near its surface) is called gravity or force of gravity.
Not only the earth but also all the planets or other heavenly bodies have gravity.The gravity of a body depends upon its mass. The gravity of the moon is about 1by6 times the gravity of the earth.
No comments:
Post a Comment