Question

What are fundamental quantities? State two examples of fundamental quantities. Write their S.I. and C.G.S. units.

Answer 1

Answer:

force which produces unit acceleration in unit mass In SI, force is measured in newton (N).

force which produces unit acceleration in unit mass In SI, force is measured in newton (N).Force is said to be I N, if it produces an acceleration of I ms-² in a body of mass 1 kg.

force which produces unit acceleration in unit mass In SI, force is measured in newton (N).Force is said to be I N, if it produces an acceleration of I ms-² in a body of mass 1 kg.The C.G.S. unit of force is dyne. If m = 1 g;a = | cms-² : F= l dyne.

force which produces unit acceleration in unit mass In SI, force is measured in newton (N).Force is said to be I N, if it produces an acceleration of I ms-² in a body of mass 1 kg.The C.G.S. unit of force is dyne. If m = 1 g;a = | cms-² : F= l dyne.Hence, force applied is said to be 1 dyne if it produces an acceleration of 1 cms-² in a mass of 1g, 1 N = 10^-5 dyne.

Answer 2

The physical quantities which can't be defines in terms of any other physical quantities, are known as fundamental quantities (or, base quantities).

There are a few fundamental quantities. Two of them are -

• Mass
• Mass Length

(Mass and length are common fundamental quantities.)

The unit (both SI and CGS) of the above mentioned fundamental quantities are as follows -

• Mass has SI unit of kilogram (kg) and CGS unit of gram (g).
• Length has SI unit of metre (m) and CGS unit of centimetre (cm).

Hence, the fundamental quantities, two examples of fundamental quantities and their units have been discussed.