Distinguish between fundamental qty and vector qty
Answers
Answer:
Fundamental quantities are those physical quantities that cannot be expressed in terms other quantities. Derived quantities are those physical quantities that are derived from the combination of fundamental quantities. It is a dependent quantity. For example : force, density, volume, momentum etc.
Explanation:
Experimentation is a core aspect of physics and other physical sciences. Theories and other hypothesis are verified and established as scientific truth by means of experiments conducted. Measurements are an integral part of experiments, where the magnitudes of and the relations amongst different physical quantities are used to verify the truth of the theory or hypothesis tested.
There are very common set of physical quantities that are often measured in physics. These quantities are considered as fundamental quantities by convention. Using the measurements for these quantities and the relations amongst them, other physical quantities can be derived. These quantities are known as derived physical quantities.
Fundamental Quantities
A set of fundamental units are defined in every units system, and the corresponding physical quantities are called the fundamental quantities. Fundamental units are independently defined, and often the quantities are directly measurable in a physical system.
In general, a system of units requires three mechanical units (mass, length, and time). One electrical unit is also required. Even though above set of units may suffice, for convenience few other physical units are considered fundamental. c.g.s (centimeter-gram-second), m.k.s (meter-kilogram second), and f.p.s (feet-pound-second) are formerly used systems with fundamental units.
SI unit system has replaced much of the older units systems. In the SI system of units, by definition, following seven physical quantities are considered as fundamental physical quantities and their units as fundamental physical units.