


So, torque exists only when there is resistance to the energy?  Like, there is 
very little torque applied to a wheel spinning "freely" at 10 rpm, but there is 
lots of torque applied to a wheel spinning at the moment it's turning at 10 
rpm that is propelling a heavy car from a standstill?

This is different than the rotational speed (or is that velocity), because there 
are different amounts of energy required to achieve the same rpm?

So the discussion is the basically about concepts like a differential locking 
the two outputs so that they are rotating at the same speed (one type of 
locking?), and a diff applying equal amounts of torque to both outputs, 
independent of the output shafts rpms (with the two shafts having different 
rpms, but the same share of the total torque)?

Am I close or clueless?