Quantities and Units
Quantities, Symbols and Units
Physics often involves looking at quantities:
A symbol is used to represent a quantity (v for speed)
A unit is what the quantity is actually measured in (m/s for speed)
Base Units and Derived Units
There are seven base units used in physics from which all the others can be derived:
Base units are the metre, kilogram, second, ampere, kelvin, mole and candela
Derived units include metres per second and kilograms per cubic metre
It is often more convenient to add a prefix to very small or very large quantities.
Converting Units: Example A
A worked example where units are converted from one form to another.
Converting Units: Example B
Here we convert units for area and volume.
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