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Polygon of Forces Apparatus (SMT-MM-20)
Self-contained, bench mounted.
Direct measurement of forces.
Adjustable lines of action of forces.
Practical verification of triangle of forces, polygon of forces
and link polygon.
Demonstrates equilibrium of forces at a point, applied to
various points round a disc or acting on a rectangular
Concurrent & Non-concurrent coplanar forces.
Instruction manual, calibrated weights supplied.
This apparatus has a round disc which is placed horizontally on three legs attached to a
foundation. A 360 protractor is set centrally on the plate and pulleys on clamps permit the
load hanger cords to run toward a ring dropped over the centre. The lines of action of the
forces are recorded by drawing along the weighted cords onto a piece of paper attached to
the pulley table. The loads are applied using the hangers and cords provided, with the cords
easily connecting to the shapes by the use of the small hooks provided. A range of
experiments is possible, investigating concurrent and non-concurrent coplanar forces acting
on simple shapes, comparing the experimental values with the relevant polygons of force.