Setups other learners found interesting in Horizontal Spring. Try one, then tweak it.
A mass on a frictionless horizontal surface is tied to a wall by a spring. With gravity removed from the direction of motion, the spring force alone governs the oscillation — the cleanest possible demonstration of Hooke's law and simple harmonic motion. Drag the mass to set an amplitude and release it.
A spring pushes back in proportion to how far you stretch it (Hooke's law) — which is why a mass on a spring oscillates. The physics, with a simulation.
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