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question regarding work done and work-energy principle watch

    • Thread Starter

    So the work energy principle states that

    change in total energy of a particle = work done on the particle

    So my question lies on what the work done on a particle actually is.

    For example, if a particle is shot up a inclined plane, and then it reaches a point of 0 velocity, then rolls back down, does it this mean:

    The work done on the particle when the particle moves up is the work done by friction?

    Does this then mean that the work done by friction = change in total energy of the particle?

    So if i had worked out the work done by friction as a particle moves from A to B is 10J, would it mean that the work done on the particle is 10J? meaning that I can use it to work out an unknown variable such as initial speed, or distance travelled?

    This has caused mass confusion for me, and someone clearing it up would be nice.

    If you mean particle in the classical physics sense, a small chunk of matter, you should specify. Most assume particle refers to 'subatomic' as per the standard model of quantum theory, unless stated otherwise.
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