Work and Power

The work done on an object by a force is the product of the component of that force in the direction of the object's motion and the displacement.

Power is the rate at which work is done with respect to clock time.

The units of force are kg * m/s^2 or Newtons.

The units of work are therefore Newtons * meters = kg * m/s^2 * m = kg m^2 / s^2 or Joules.

The units of power are therefore Joules / second = N m / s = kg m^2 / s^3.