Nope, not missing the point I'd draw an equivalent diagram, but I'm too lazy Here's the lazy version -> -> -> -> -> ->O This is the diagram of the kicks I've done, plus the new kick on the right. Speaks for itself, really. There is the force of several kicks adding together (to the speed), while it only takes the energy of one kick to maintain the system (increase speed). At this moment, I am kicking it once, but it has the speed of 6 kicks! This is the multiplying effect.