THEORY OF RELATIVITY, EINSTEIN THEORY OF RELATIVITY
The theory that deals with relativity motions of bodies is called Theory of Relativity. The Theory of Relativity shows that the Classical Mechanics is not applicable to bodies moving with velocity nearer to the velocity of light. According to Classical Theory, Space and Time are absolute. The flow of time is assumed to be confirmed in all situations, the movement of time and time intervals are identical in all frames of reference and that, similarly, lengths are also identical in all frames. But these concepts are not valid at high velocities. The theory of Relativity provides many new concepts such as:
1) The length of a moving body contracts in the direction of motion.
2) Clock in motion slow-down.
3) At high speed, speed and time are no more separate but merge into space-time continuous.
4) The mass of a moving body is greater than its mass when at rest.
CONCEPT OF RELATIVITY
(A) Let us consider a river flowing and two persons (A and B) are standing on the banks of the river facing towards each other. Now the person A will say that house is on the right side while the Person B will say that house is on the left side. But actually the position of house is fixed. This indicates that position is relative.
(B) If someone asks whether ball is large or small? If we compare the ball with earth then we will say that ball is small but if we compare the ball with an atom, then we will say that ball is large. This indicates that size is relative.
Similarly time and motion are also relative.