# Einstein's Theory of Special Relativity

Einstein's theory of special relativity is a scientific theory that focuses on how time, speed, and space interact and how the laws of physics are the same in all inertial frames. The first step to take when studying Einstein's theory of special relativity is to study the two postulates that Einstein put forward for special relativity.

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What does Einstein’s theory of special relativity tell us?

Einstein’s theory of special relativity tells us that the laws of physics are the same in all inertial frames of reference and that the speed of light in a vacuum is constant regardless of the motion of the observer.

What are the two postulates of Einstein’s theory of special relativity?

The first postulate of Einstein’s theory of special relativity states that the laws of physics are the same in all inertial frames of reference. The second postulate states that in a vacuum, the speed of light is constant at  c=3.00*10^8 m/s.

How can we explain Einstein’s theory of special relativity?

According to special relativity, the speed of light is a limit that can be approximated but never exceeded by any object with mass. It is the source of one of the most famous equations in science, E=mc^2, which states that mass and energy are the same physical entity and can be transformed into one another.

## Test your knowledge with multiple choice flashcards

A muon is observed by an observer on Earth and travels at a velocity of 0.620c for 10.0s from the moment it is spotted until it vanishes. Find the length relative to the observer.Hint: Use the length contraction equation.

Calculate the rest energy of a 1.85 grams mass.

Which of the following is true?

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