Re: [Phys-l] Turning effects of a moving bike

["Bob Sciamanda" <trebor@winbeam.com>]

> This issue has had me thinking for many years about whether the condition
> for rotational equilibrium is a consequence of Newton's Laws or is 
> something
> imposed in addition to them -- what do the rest of you think?
>
> Steve Highland

Net Torque=dL/dt, applied to a system, using any inertial origin OR the 
system CM as origin, is provable from Newton's laws alone.  If one adds the 
constraint that all internal forces are central forces, then the internal 
torques drop out in pairs and Net External Torque=dL/dt.  All of this ( and 
the use of non CM or non inertial origins) is standard matter in most 
intermediate Classical Mechanics texts.

Bob Sciamanda
Physics, Edinboro Univ of PA (Em)
trebor@winbeam.com
http://www.winbeam.com/~trebor/