Suspension of a particle by a radical absolutely flexible line with constant length and negligible Quality, and cyclic motion in a plumb Plane under the action of gravity, becomes a simple pendulum. When a simple pendulum oscillates at an Angle less than 5° (now generally considered to be less than 10°), it can be approximated as a simple harmonic motion. Simple pendulum motion cycle formulas: T=2π√(L/g). Where L is Pendulum length and g is local gravity acceleration.

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cycle ：T²=4PI²*L/g

T = cycle

L = Pendulum length

g = gravity acceleration