You kind of do. If you go past 90 degrees you will fall straight back down, not along the arc of the swing. Your energy will go into bouncing the swing, and you lose momentum towards going 360. Once you get past 90 and start dropping straight down it’s pretty much impossible to add more energy into the system than you already have.
I remember in elementary school, tossing the swing around the top pole so that a swing would not sit so low to the ground. I feel like this is relevant in the sense that it is possible to get a swing with slack chains wrapped around the top.
Right, that’s what I’m saying. The energy isn’t lost when the chain goes slack, but when it goes taut again. So a method of harnessing the energy at that point might work.
But when the chains go from slack to taut the kid will fall off the swing and since that’s what we’re talking about here…
Oh great, just what I need, to fall off the swing.