4. Force System - Moment

8/20/2019 4. Force System - Moment

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MOMENTBy Rani Rumita


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• The Moment of a Force also known as the torque (T),is dened as the force F acting at a perpendiculardistance d, and causes an o!ect to rotate

• Tendency of the force to rotate the ody aout the

a"is

• The asic units of

moment in #$ units are

%ewton&meters (%'m),

and in the '#'

customary system are

ound&feet (l&ft)

Moment (M)


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Magnitude of Moment

The magnitude of themoment or tendency of theforce to rotate the odyaout the a"is *&*

perpendicular to the plane ofthe ody is proportional othto the magnitude of the force

and to the moment arm d,which is the perpendicular

distance from the a"is to theline of action of the force


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The Right +and Rule

The moment is a ector Mperpedicular to the plane of theody' The sense of M dependson the direction in which F

tends rotate the ody' Theright hand rule, Fig' -'.'c, isused to identify this sense'

/e represent the moment of Faout *&* as a ector pointingin the direction of the thum,with the ngers curled in thedirection of the rotationtendency


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/hen dealing with forceswhich all act in a gien plane,we customarily speak of themoment aout a point

By this we mean the momentwith respect to an a"is normalto the plane and passingthrough the point

The moment of force F aoutpoint 0 in Fig' -'.'d' has themagnitude M 1 F'd and iscounterclockwise


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2*3 B45## 6*7

*M #+0%T$ #+0%T$ #+0%T$ *M7

/0##040M 040$8M /0R*+M0T440+$ /0B0R*80T+7

%0M0#T5

THANK

YOU

4. Force System - Moment

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