When we know the speed of a moving object, say an Ola Cab, we only have information on how fast its moving without actually knowing whether the Car is moving in North Direction, South Direction or otherwise. Velocity provides us information about both, the speed of the car and the direction of speed. Velocity definition physics is given as the distance travelled by a body, per unit of time in a given direction. It can be represented as : –
Physics Class 9
Sir Isaac Newton’s Universal Law of Gravitation can be applied both at cosmic level and atomic level. It follows inverse square law of force.
In daily life we observe things falling from a height. We often drop a pen or a pencil. A ball thrown up comes down. Isaac Newton saw an apple falling from a tree. He thought why not the apples go up?
The invisible force that attracts an apple towards the earth led to the idea of gravitation.