Setups other learners found interesting in Bouncing Ball. Try one, then tweak it.
A ball moves in a straight line at constant speed until it meets a wall, then rebounds. It is the simplest possible model of motion and collision: velocity, reflection, and — once gravity and restitution are switched on — energy loss on each bounce. Watching one velocity component flip at every wall makes the idea of a vector concrete.
A bouncing ball loses speed at each impact, keeping a fraction e (restitution). Every bounce reaches e² of the last height — the maths, with a simulation.
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Acceleration is how fast velocity changes. Aim a constant acceleration at a target and the ball speeds up, overshoots and loops back — here is why.
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