Special Relativity is one of the most exciting topics in AQA A-Level Physics. Although it appears difficult at first, every concept follows logically from two surprisingly simple assumptions. Once these ideas are understood, equations such as time dilation and length contraction become much easier to apply.
Einstein built his theory upon two revolutionary principles:
Every relativistic equation depends on the Lorentz factor.
| Symbol | Meaning |
|---|---|
| γ | Lorentz factor |
| v | Object velocity |
| c | Speed of light |
Moving clocks tick more slowly than stationary clocks.
Objects become shorter only in the direction of motion.
Momentum increases rapidly as velocity approaches the speed of light.
Mass and energy are two forms of the same physical quantity.
Special Relativity explains how space and time behave at extremely high speeds. Understanding the Lorentz factor allows students to solve problems involving time dilation, length contraction, relativistic momentum and energy with confidence.
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