Adding force to a picked object

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I guess you could use the dot product to determine how much force to transfer. I suppose friction comes into it as well. I suspect movement would tend to be against the normal, but I guess there would also be a torque introduced which complicates things beyond my limited understanding. I imagine it would depend on where the centre of gravity is in relation to the picked point.

Anyway is this in relation to ODE? I assumed it would do that sort of stuff for you. If it doesn't it is not up to much.