Distinguish between derived and primary quantities?

Primary quantities are fundamental physical quantities that cannot be defined in terms of other physical quantities. Examples of primary quantities include length, mass, time, and electric current.

Derived quantities, on the other hand, are physical quantities that are defined in terms of one or more primary quantities. These quantities are obtained by combining primary quantities using mathematical operations. Examples of derived quantities include velocity (defined as the rate of change of displacement with respect to time), acceleration (defined as the rate of change of velocity with respect to time), and force (defined as mass multiplied by acceleration).

In summary, primary quantities are fundamental and cannot be defined in terms of other quantities, while derived quantities are defined in terms of one or more primary quantities.