Units of force — lesson. Science State Board, Class 10.

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Force:

Force is an external effort in the form of push or pull.

It produces or tries to initiates the motion of a static body.
It stops or tries to stop a moving body.
It changes or tries to change the direction of motion of a moving body.

Force has both magnitude and direction. So, it is a vector quantity.

Units of force:

The SI unit of force is newton (

$N$ ), and in the C.G.S. system, its unit is dyne.

$1\ N$

$ewton$ (

$N$ ):

The amount of force needed for a body of mass

$1\ kg$ produces an acceleration of

$1$

$m s^{- 2}$ ,

$1$

$N$

$=$

$1$

$kg$

$m s^{- 2}$

$1\ dyne$ :

The amount of force needed for a body of mass

$1\ gram$ produces an acceleration of

$1$

$cm s^{- 2}$ ,

$1$

$dyne$

$=$

$1\ g$

$cm s^{- 2}$ , also

$1$

$N$

$=$

$10^5$

$dyne$

Unit force:

The amount of force needed to produce an acceleration of

$1$

$m s^{- 2}$ in a body of mass

$1$

$kg$ is known as ‘unit force’.

Gravitational unit of force:

In the S.I. system of units, the gravitational unit of force is kilogram-force, represented by

$kg f$ . In the C.G.S. system, its unit is

$gram force$ , represented by

$g f$ .

$1$

$kg f$

$=$

$1$

$kg \times 9.8$

$m s^{-2}$

$=$

$9.8$

$N$

$1$

$g f$

$=$

$1$

$g \times 980$

$cm s^{-2}$

$=$

$980$

$dyne$

$1$

$kg f$

$=$

$1000$

$g \times 980$

$cm s^{-2}$

$=$

$980 \times 10^{3}$

$dyne$

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14. Units of force

Theory: