Why is it tiring to push hard against a solid wall even though no work is done?

  • Thread starter Mad_Eye
  • Start date
  • #76
Not sure if this helps you, but it it helped me a little. (I'm right where you are in the work and kinetic energy chapter)

"...and because the objects do not behave as particles, it is generally not correct to apply the particle form of the work-energy theorem to objects subject to frictional forces."
(The example is 2 cars crashing. Resnick, Halliday, Krane Volume 1 Physics)

If your body and the wall aren't particles, and the wall your pushing on is also experiencing a large frictional force from the ground it's attached too, then i think this is saying you can't apply the work energy theorem as its been given to us.

It goes on to say we will find out how to deal with complex systems like cars and walls in a few chapters so you might also try looking there.
(take everything I've said here with a very large grain of salt please)
 

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