Re: Ideal Wheels: was( L2-"Negotiating" a curve.)

[Bob Sciamanda <trebor@VELOCITY.NET>]

Joel wrote:
>  . . .2) Wheel is speeding up
> There must now be a forward static friction force to account for the
> non-zero a_cm.  But this force give a torque in the wrong sense and
would
> serve to slow down the rotation of the wheel.
> . . .

Tell the rest of the story; the acceleration process is initiated by a
motor exerting a torque on the axle shaft, in the proper direction for
your required "forward direction", and larger than the friction torque at
the road.

Bob

Bob Sciamanda (W3NLV)
Physics, Edinboro Univ of PA (em)
trebor@velocity.net
http://www.velocity.net/~trebor