Thread: What is energy?
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May30-09, 08:02 AM
P: 19
What is energy?

Quote Quote by jambaugh View Post
To answer your first question the transfer of energy is most often effected by the action of a force. Recall the classic definition of energy as "the ability to do work". Well work is the action of a force across a distance. So for example if you hit a steel plate with a baseball the ball's kinetic energy is transferred to the steel plate by the action of a force at the "point" of contact. The work is done by the large force over the small distance the plate is deforming as it stops the ball. The plate then vibrates which pushes (applies a force) to the air around it. The molecules of air then vibrate as pressure waves (pressure=force/unit area) carrying the energy away as sound.
but how do lets say kinetic energy be converted to light?