vmd教程 forces-tutorial
1TCLFORCES11x
Figure3:Relationshipsamongvariablesinthescriptrot-a.tclAngularacceleration.Angularaccelerationisgovernedbyan
equationanalogoustoNewton’sSecondLaw:
τ=Iω(1)
τistorque(analogoustoforce),ωistheangularacceleration,and
Iisthemomentofinertia(analogoustomass).Torqueisgivenby
τ=ρ×F
whereFistheforceandρisapositionvectorrelativetotherotation
axis(seeFig.3).Inourcase,weapplytheforceperpendicularto
theρvector,sothecrossproductsimpli esandweget
τ=ρF(2)
forthemagnitude.Forpointparticles,themomentofinertiais
simplyI=mρ2,wheremistheparticle’biningthis
withEqns.1and2andsolvingforF,weget
F=mωρ
fortheforceperparticletoachieveaspeci edangularacceleration.
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