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Thanks -- now I understand your method.
bc
Brian Whatcott wrote:
>At 08:06 PM 3/17/2007, you wrote:
>>And the torque at the road? -- how about a cog railway?
>>
>>bc
>If I instantiated a lever with fulcrum in a rail cog, bearing on a
> vehicle hub and activated by a force at some higher point.
>no modeler would see much of a problem with it, I don't suppose.
>
>But to answer the question: a force at the rail cog provides
> a torque to the Earth mass to my mind.
>