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Swing Lab

A prediction you can test. Change one variable and compare the period.

Length and bob size fit the diagram. Values use real units.

One complete oscillation

2.006 seconds

T = 2π√(L/g)

Your variables

Mass changes the bob’s drawn size. It does not change this model’s period.

Ideal small-angle model. Fixed 8° amplitude. No drag, friction, damping or large-angle correction. Length means pivot to bob centre.

Before you change it

Variable I am testing

Three useful checks

1 m at Earth gravity: 2.006 s

4 m at Earth gravity: 4.012 s

Change mass: same period

These values use g=9.81 m/s². A complete oscillation returns to the same position moving in the same direction.

Your observations

Model outputs, not physical measurements. Your entries stay in this page until you reload.

Recorded comparisons
ChangedLength (m)g (m/s²)Mass (kg)T (s)