Question

Which is not the unit of force?
$A.$ Pound
$B.$ Dyne
$C.$ Joule
$D.$ Newton

Answer 1

Hint: Here we will proceed by demonstrating all the options one by one in order to find out which is not the S.I. unit of force.

Complete Step-by-Step solution:
Let us explain all the options one by one in order to find out which is not the unit of force.
Pound- is the unit of force in the FPS system- a non-technical unit of force equal to the mass of 1 pound with an acceleration of free fall equal to $31ft/sec ^2$ .
Dyne- It is equal to force in CGS system- The dyne is a unit of force specified in the (CGS) system of units. Dyne, unit of force in the centimetre-gram-second system of physical units, equal to the force that would give a free mass of one gram an acceleration of one centimetre per second. One dyne equals 0.00001 newton.
Joule – It is the S.I. unit of work and energy- It is equal to the energy transferred (or work done) when applying a force on one newton through a distance of one meter (1 newton meter on n $ \times $ m), or in passing an electric current of one ampere through a resistance of one ohm per second.
Newton – Newton, the absolute unit of force in the International system of units (S.I.). It is defined as that force necessary to provide a mass of one kilogram with an acceleration of one meter per second. 1$m/\sec^2$

Note: Whenever we come up with this type of problem where we are asked to find out which is not the unit of S.I. unit of a quantity. Then we try to demonstrate all the standard units of force one by one. (here standard unit of force).