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Force Addition Lab: Parallelogram, Triangle and Polygon Rules
Drag two or more forces and watch their resultant appear by the parallelogram, triangle or polygon rule, with the magnitude and direction worked out live.
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Drag two or more forces and watch their resultant appear by the parallelogram, triangle or polygon rule, with the magnitude and direction worked out live.

Split a force into components along any two given directions, and see why oblique components are not projections.

Add any number of coplanar forces by summing x and y components, and find an unknown force from a known resultant.