A conveyor belt is moving, so it has kinetic
energy. When a stationary object is put on the
belt, it starts moving and also then gets kinetic
energy. But, the object before going on the
conveyor belt didn't have potential energy,
so where did the kinetic energy come from?
The answer is that the engine driving the
conveyor belt is converting chemical energy stored
in gasoline into the kinetic energy to move the
belt and the things on the belt. (The way an
engine transfers energy is the subject of college
courses, but in short, it takes chemical energy
and converts it to potential energy, which then is
converted to kinetic energy.)
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