Quick Answer: The Equilibrium Forces Composition Device is a mechanics apparatus for studying concurrent forces that act at a single point. Strings from a central point run over pulleys to weight hangers, so known forces can be applied in different directions and balanced.
Last updated: October 2026
Key Features
Pulleys, strings, hooks and weight hangers for applying forces in different directions
Angles between the strings are measured against a graduated scale
Used to verify the parallelogram, triangle and polygon laws of forces
Supports experiments on Lami’s theorem and on resultant and equilibrant forces
About This Product
Students hang known weights on the strings and adjust them until the central point stays balanced, then record the loads and the angles between them. The resultant found by vector addition or a scale drawing is compared with the observed equilibrium, which makes the vector laws of forces concrete.
Frequently Asked Questions
Which laws can be verified with the Equilibrium Forces Composition Device?
The parallelogram law, triangle law and polygon law of forces, and Lami’s theorem for three concurrent forces in equilibrium.
