Study Online and Download KIPS 9th Class Physics Notes Unit 5: Gravitation.
Study Online and Download KIPS 9th Class Physics Notes Unit 5: Gravitation. The first man who came up with the idea of gravity was Isaac Newton. It was an evening of 1665 when he was trying to solve the mystery why planets revolve around the Sun. Suddenly an apple fell from the tree under which he was sitting. The idea of gravity flashed in his mind. He discovered not only the cause of falling apple but also the cause that makes the planets to revolve around the Sun and the moon around the Earth. This unit deals with the concepts related to gravitation.
After studying this unit, the students will be able to:
- state Newton's law of gravitation.
- explain that the gravitational forces are consistent with Newton's third law.
- explain gravitational field as an example of field of force.
- define weight (as the force on an object due to a gravitational field.)
- calculate the mass of Earth by using law of gravitation.
- solve problems using Newton's law of gravitation.
- explain that value of g decreases with altitude from the surface of Earth.
- discuss the importance of Newton's law of gravitation in understanding the motion of satellites.
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