Chap -I  Gravitation (Std X) State Board
Channel: Gurukul AGGT
Date: 17/04/2020

The phenomenon of gravitation was discovered by Sir Isaac Newton. As the story goes, he discovered the force by seeing an apple fall from a tree on the ground. He wondered why all apples fall vertically downward and not at an angle to the vertical. Why do they not fly off in a horizontal direction? 
Let's find out by understanding this chapter and try to get how the unknown Gravitational force was discovered.