Physics Module 2 - Foundations of Physics

Physical Quantities, Units and Measurements

Physical Quantities A quantity is a measurement of something

Units S.I. Base Units Mass - kilogram - kg Length - metre - m Time - second - s Temperature - kelvin - K Electrical current - ampere - A Amount of substance - mole - mol Luminous Intensity - candela - cd Derived Quantities and their S.I. Units Acceleration - metres per second squared - m/s^2 Density - kilograms per cubic metre - kg/m^3 Electric charge - coulomb - C Energy - joule - J Force - newton - N Momentum - kilogram metres per second - kg/m/s^1 Potential difference - volt - V Power - watt - W Pressure - Pascal - Pa Velocity - metres per second - m/s^1

Unit Prefixes Standard form is used to write down very big and very small numbers in a quick and efficient way