Explain the difference between fundamental and derived quantities, and give one example of each.

### The concept A fundamental quantity is a measurement starting point that is defined independently of other physical quantities. Length, time, and mass are examples. A derived quantity is calculated by combining fundamental quantities through multiplication or division. Area is length multiplied by length, and speed is distance divided by time. Their units show the relationship: area can be written as $\text{m}^2$, while speed can be written as $\text{m}/\text{s}$. ### What a good answer covers - Define a fundamental quantity as independent of other quantities. - Define a derived quantity as a mathematical combination of base quantities. - Give a valid example of each. - Show how the derived example depends on base quantities. ### Terms - **Fundamental quantity**: an independent base measurement. - **Derived quantity**: a measurement formed from base quantities. - **Area**: a surface measure formed from two lengths. - **Speed**: distance travelled per unit time. ### Remember Ask whether the quantity is a starting point or a combination of other measurements.