Physics: RELATIVITY
Einstein introduced the concept of relativity. There are different types of relativity general relativity and special relativity. Both the concepts are used in physics in order to explain different phenomena. General relativity is the actual theory of gravitation that was invented .by Einstein in 1907. The theory of relativity helps to understand how an uncharged article then enters any field exhibits accelerated motion. The gravity present on the earth that helps in holding our environment and keeps everything that is on the ground at its position. Moreover, if there was no presence of gravity then most of the objects would have been flying in the air.
Free fall of our body from a height and inertia is also explained by the theory of relativity. In addition, inertia is that property of a body through which it prevents any change in its position of motion or rest. For example, when you are sitting in a bus your upper body is in contact with the seat and the lower body is in contact with the floor of the bus. As the buses in motion your lower body is also in motion but you are the upper body is in a state of rest. When the bus turns suddenly, you experience that your upper body moves in the direction of the turn whereas your lower body which is in motion resist any change in its motion. This property of inertia has been helpful in understanding many different concepts.