The pendulum’s secret
Compare swings as you change length and starting angle.
THE EXPERIMENTReady when you are
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How it works
How it works.
Small-angle θ(t) = θ₀ cos(√(g/L)t); T = 2π√(L/g).
Assumptions and limits
Small-angle approximation limited to 15°, g = 9.81 m/s²; ideal frictionless point mass.