Physics Asked by Code Complete on February 17, 2021
Wikipedia writes:
Work transfers energy from one place to another, or one form to
another.
Besides, physical work is always done by some force.
I cannot think up an example when some force transfers energy from one place to another (without converting energy from one form to another).
“Transfers energy from one place to another” – means energy is not changed, but just transferred (in space). I cannot imagine when work is done and there is no energy change of some kind. I thought that work is always about changing energy.
P.S. When I drag something on a rope – it is electrical energy (reaction force) to kinetic (accelerating dragged particle).
Work – is a very fundamental thing not to have a clear understanding of its deep physical essence!
"I cannot think up an example when some force transfers energy from one place to another (without converting energy from one form to another)."
Two equal masses are joined by a string that passes over a pulley. They hang in mid air. One is given a slight upward push. It gains gravitational potential energy, while the other mass loses it. Other accompanying energy transformations (e.g. into thermal, out of kinetic) can be made as small as we like.
Will this do?
Answered by Philip Wood on February 17, 2021
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