Something I don’t quite understand from a physics standpoint. Imagine a car going down a road approaching a roundabout, on neutral; it can follow the roundabout 180 degrees and start going in the reverse direction while only losing a little speed/energy. But the car did a lot of “work” in the physics sense — a multi-thousand-pound vehicle completely reversed direction in a few seconds. How is that energy redistributed (force diagram, etc) to show where the energy for all that work came from?
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If you go 180 around a roundabout, your speed is going to be cut in half if not more. You lose tons of energy through heat and sound of the tires and the drive train turning sharper. Most modern CV joints are extremely tight and inefficient while turning.
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