A fixed step length makes force the source factor for useful work. Exact arithmetic here means exact results for the stated model inputs; measured inputs still carry uncertainty and significant-figure limits.
highlighted = computed this step
Four newtons over two metres gives eight joules
Hold the step length at 2 metres and use one motor step. A force of 4 newtons makes 8 joules of useful work.
4⋅2=8
Six newtons gives the twelve-joule standard row
The same 2 metre step with 6 newtons gives 12 joules. Only the force input changed, so the work arrow length changes with it.
6⋅2=12
Eight newtons makes sixteen joules for the same step
With force raised to 8 newtons, the fixed step produces 16 joules. The scan makes force times distance visible before any step count is added.