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Fundamental quantities, SI units and important laws of physics — a high-yield quick reference for competitive exams.
| Quantity | SI Unit |
|---|---|
| Length | metre (m) |
| Mass | kilogram (kg) |
| Time | second (s) |
| Electric current | ampere (A) |
| Temperature | kelvin (K) |
| Force | newton (N) |
| Work / Energy | joule (J) |
| Power | watt (W) |
| Pressure | pascal (Pa) |
| Frequency | hertz (Hz) |
| Law / Principle | About |
|---|---|
| Newton's Laws of Motion | Inertia, F = ma, action & reaction |
| Law of Gravitation | Every mass attracts every other mass (Newton) |
| Archimedes' Principle | Upthrust on a body equals the weight of fluid displaced |
| Ohm's Law | V = IR (voltage, current & resistance) |
| Law of Conservation of Energy | Energy can neither be created nor destroyed |