Balance can be destabilized by:

1) Adding weight¹ to either side. 2) Subtracting weight from either side. 3) Moving fulcrum to either side.

1 depending on context weight may also be density, temperature, pressure, etc.

See Also

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Balance Equation Equilibrium Figure 13.14 - Equilibrium as Reciprocal Forces Figure 13.15 - Equilibrium as Musical Tonal Equivalents Figure 13.16 - Compound Equilibrium States Fulcrum Neutral