Mechanics → Introduction to Mechanics → Physical Quantities and Units
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Physical Quantities and Units

Physics relies on measurable quantities.

Fundamental Quantities

Quantity Unit Symbol
Length meter m
Mass kilogram kg
Time second s

Derived Quantities

Velocity:

$$ v = \frac{\text{distance}}{\text{time}} $$

Acceleration:

$$ a = \frac{\text{change in velocity}}{\text{time}} $$

Force:

$$ F = ma $$