What is defined as work over time?

The concept defined as work over time is power. Power quantifies the rate at which work is done or energy is transferred. In physics, work is defined as the energy transferred when a force is applied over a distance. To find power, you take the total work done and divide it by the time it takes to do that work. This relationship can be expressed mathematically as:

Power (P) = Work (W) / Time (t)

In practical terms, if a machine performs a certain amount of work in a shorter time frame, it is said to have higher power compared to the same amount of work done over a longer period. This is why power is often associated with the efficiency and effectiveness of engines and motors—the higher the power, the quicker they can perform work.

On the other hand, force, energy, and velocity do not fit the definition of work over time. Force measures the push or pull exerted on an object, energy is the capacity to do work, and velocity describes the speed of an object and its direction of motion, none of which directly relate to the concept of power as work per unit of time.