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Old 12-02-2003, 09:05 AM
  #7072  
Horatio
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Originally posted by lee82gx
well if u want to take it a little further,the rpm(when it's constant) of the motor does not produce a torque on the chassis.when the speed is constant,the whole car is considered as a SINGLE rigid body.
only a change/acceleration of the rotation produces torque.
this is countered(opposite direction) by
1.the moment of inertia of the drivetrain(normally constant)
moment of inertia is about
2.drag of the drivetrain(which might be constant,but might not also)

so the torque(not motor output torque)but inertial torque(ie angular accel x motor's moment) - moment(drivetrain) - drag = car roll.

car roll would then be product of it's own moment of inertia that is a function of it's weight distribution.
Ahhh, thanks for this. I knew my physics was a bit rusty

So does this mean that the RPM difference between the Drive Train and the Armature doesn't actually have an effect on the chassis roll - ONLY the angular acceleration x the armature's polar moment of inertia - the drive train - drag?
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