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[Phys-L] Re: Energy is primary and fundamental? (was RE: First Day Activitiesor Demos)



Richard Tarara wrote:

I am standing still on a level floor. How do I start walking? Answer that
VERY BASIC question with energy please?

Yes, that question is basic, and indeed profound.

The answer involves *two* conserved quantities, namely energy
and momentum. It cannot be answered using either alone.

One amusing thing is that the energy comes from within the
pedestrian, while the momentum comes from outside, and must
flow across the boundary.

For details, see
http://www.av8n.com/physics/car-go.htm