Physics Module 2 - Foundations of Physics

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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