The work done by a force acting on an object is equal to the amount of force multiplied by the distance travelled in the direction of the force. Which of the following is not a unit of work?

To identify which option is not a unit of work, let's analyze each:

Work = Force × Distance

SI unit of force = Newton (N)

1 N = 1 kg·m/s²


Work = N × m = (kg·m/s²) × m = kg·m²/s²


So, the SI unit of work is kg·m²/s², which is also called a Joule (J).

Now, let’s check the options:

A. kg·m/s² → This is Newton, which is a unit of force, not work.
→ Not a unit of work.

B. kg·m²/s² → This is the unit of work (Joule).
C. Newton meter (N·m) → Also kg·m²/s², so this is a unit of work.
D. Joule → Defined as kg·m²/s², so this is a unit of work.

Correct answer: A. kg·m/s²