PURPOSE: To demonstrate equilibrium of torques.

DESCRIPTION: Weights are hung along the two-meter scale to balance torques about the center of the scale.

SUGGESTIONS: Designed for large groups; B2-33 is a smaller version. See Question of the Week #201 for suggestions on using this demonstration to enhance class involvement.

REFERENCES: (PIRA 1J40.20)

EQUIPMENT: Scale with support, three 1-kg weight hangers, three 1-kg masses.

SETUP TIME: 5 min.