Question

Give two examples of the fundamental physical quantities along with their S.I. units.

Answer 1

Hint:A quantity that can be measured in terms of other quantities is called a physical quantity. A standard unit is an exact quantity that is used to compare measurements. A standard unit that is universally acceptable is called an S.I unit.


Complete step by step solution:
Two examples of fundamental physical quantities in physics with their S.I, units are as follows:
1.Length – In physics, length is defined as the distance between two points. This distance can range from the diameter of a hair to the distance between Earth and Moon. Rulers and measuring tapes are used to measure length. The S.I. unit of length is meter (m). For example: The bat is 1 m long. A unit of distance larger than meter is kilometre (km) and a unit smaller than meter is centimetre (cm).
2.Mass – The amount of matter in an object is termed as its mass. The S.I. unit if mass is kilogram (kg). For example: The luggage weighs 20 kg. Another unit of mass that is very common and smaller than kg is gram (g). A unit greater than kg is tonne.


Note:We should not confuse mass with weight. Mass is a constant quantity while weight changes according to the gravitational force. Some other physical quantities are time (second), temperature (Kelvin). Different units of length are common at different places. For example: Units of length like yards, feet and miles are common in countries like the United states and United Kingdom.