Introduction to Gravity
Introduction to Gravity:
- It is a common belief that an apple fell on Newton’s head and he realized that gravity exists. This isn’t completely incorrect. But Newton already knew about the existence of gravity. He was just trying to find out if the gravitational pull of the earth was what was holding the moon in its orbit.
- Since the apple fell perpendicular to the earth (and not in any other direction) and gathered up speed as it fell, he realized that it obviously was being accelerated at some rate. This rate of acceleration was acceleration due to gravity.
Acceleration is caused by force when a net force acts on a body and keeps acting in the same direction, the body will accelerate in that direction. One force that always acts on the bodies that have mass is gravity, if we consider the force of gravity acting on a body excluding the air resistance, the body should theoretically accelerate towards earth at the rate of 9.81 m/ \(s^2\).
Force acting on a body due to gravity is given by:
f = mg
Where f is the force acting on the body,
g is the acceleration due to gravity,
m is mass of the body.