Thread: What is energy?
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Nov30-08, 10:00 PM
P: 17,340
No it's not. For example, if an object of mass m is hurtling through deep space at velocity v then it has a kinetic energy of 1/2 m vē, meanwhile the force is 0 so f.d is 0. There is no work but there is energy.

The object has the ability to do work, e.g. by colliding with some other object and thus exerting a force on the other object over some distance, in which case the work done would be equal to the change in energy, but the energy is not work and is therefore not f.d.