Wringkrag: Verskil tussen weergawes
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RAM (besprekings | bydraes) Nuwe blad: frame|right|Wringkrag aangewend deur 'n [[verstelbare moersleutel]] [[Beeld:Torque_animation.gif|frame|right|Verwantskap tussen krag, wringkrag en [[draaimo... |
RAM (besprekings | bydraes) No edit summary |
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[[Image:moment arm.png|thumb|right|250px|Moment arm diagram]] |
[[Image:moment arm.png|thumb|right|250px|Moment arm diagram]] |
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A very useful special case, often given as the definition of torque in fields other than physics, is as follows: |
A very useful special case, often given as the definition of torque in fields other than physics, is as follows: |
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<!--:''τ'' = moment arm × force--> |
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:<math>\boldsymbol{\tau} = (\textrm{moment\ arm}) \times \textrm{force}</math> |
:<math>\boldsymbol{\tau} = (\textrm{moment\ arm}) \times \textrm{force}</math> |
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The construction of the "moment arm" is shown in the figure below, along with the vectors '''r''' and '''F''' mentioned above. The problem with this definition is that it does not give the direction of the torque but only the magnitude, and hence it is difficult to use in three-dimensional cases. If the force is perpendicular to the displacement vector '''r''', the moment arm will be equal to the distance to the centre, and torque will be a maximum for the given force. The equation for the magnitude of a torque arising from a perpendicular force: |
The construction of the "moment arm" is shown in the figure below, along with the vectors '''r''' and '''F''' mentioned above. The problem with this definition is that it does not give the direction of the torque but only the magnitude, and hence it is difficult to use in three-dimensional cases. If the force is perpendicular to the displacement vector '''r''', the moment arm will be equal to the distance to the centre, and torque will be a maximum for the given force. The equation for the magnitude of a torque arising from a perpendicular force: |
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<!--:''τ'' = distance to centre × force--> |
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:<math>\boldsymbol{T} = (\textrm{distance\ to\ center}) \times \textrm{force}</math> |
:<math>\boldsymbol{T} = (\textrm{distance\ to\ center}) \times \textrm{force}</math> |
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Wysiging soos op 23:20, 9 April 2007
In Fisika, kan wringkrag informeel gedefinieer word as 'n krag wat 'n draaiende beweging tot gevolg het. Hierdie krag word gedefinieer as die lineêre krag vermenigvuldig met 'n radius. Die SI-eenheid vir wringkrag is die newton-meter (N m). Die simbool vir wringkrag is τ. Die begrip wringkrag word ook moment in fisika genoem en vind sy oorsprong in Archimedes se werk op hefbome.