Physical work (W) occurs, if through the influence of a force (F), a body is moved a certain distance (s). Energy is stored force (using the same unit). It can neither be created nor destroyed, only transformed. One form of energy is, e.g., heat.
ExampleVar. set: F = 530 N; s = 12 mVar. asked for: W in JAnswer:W = F · s = 530 N · 12 m = 6360 J