It is an effect of energy transfer, of a sort, but the energy is not being transferred from you to the wall. Your sweating is a result of internal temperature increasing beyond the set-point of your hypothalamus. The heat is generated as a side product of molecular conversion of energy from chemical (ATP) to mechanical.The dynamic contraction and relaxation of individual myosin heads is what produces the force in an isometric muscle contraction. Macroscopically, the length of the muscle does not contract, but on the level of individual myosin molecules, they constantly are moving back and forth.
On Saturday, March 10, 2012 8:41:12 PM UTC-5, Nathan McCorkle wrote:
On Sat, Mar 10, 2012 at 6:23 PM, Simon Quellen Field <sfield@scitoys.com> wrote:--
> When a bullet is fired, half the energy does not go into the gun.
> Newton's third law is about force, not energy.
> When you push against a wall, it pushes back with equal force, or else
> something
> will move. Only when something moves has work been done, or energy
> transferred.:)
Why do I sweat when I push on a wall then? Isn't that an effect
(side-effect?) of
energy transfer?--
Nathan McCorkle
Rochester Institute of Technology
College of Science, Biotechnology/Bioinformatics
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