I know about the units, I usually work in SI.
If the force during a lift is at some time greater than that strictly necessary to lift the weight, then the force plate will measure this (we weren't talking about work, I know gravity is a conservative field). My point was that you don't need to lift triple bodyweight in order to record triple bodyweight forces.
The fact that you can measure them during a sprint is an example of this.
I think it is misleading to imply that one needs to do triple bodyweight one legged squats to equal sprinting forces.