Final answer:
Fundamental units in physics include length, mass, time, and electric charge, and other quantities like force, speed, and energy are derived from these fundamental units. Examples of derived units are area (m²), volume (m³), speed (m/s), and density (kg/m³), all based on combinations of the fundamental SI units.
Step-by-step explanation:
In Physics, certain physical quantities such as length, mass, time, and electric charge are considered more basic than others and are deemed fundamental units. These units are fundamental because other physical quantities, called derived quantities, such as volume, force, speed, density, and energy, can be mathematically constructed from these basics. For example:
- Area is derived from two lengths (length × length = m²).
- Volume from three lengths (length × length × length = m³).
- Speed is length divided by time (m/s).
- Density is mass per volume (kg/m³).
All these derived units are based on the fundamental SI units which are meter (length), kilogram (mass), second (time), and so forth.