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3D Force Vector Builder: Angles, Two Points and Sums
Build a force in space from its components, its three direction angles, two angles or two points, turn the 3D view with the mouse, and add several forces into one.
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Build a force in space from its components, its three direction angles, two angles or two points, turn the 3D view with the mouse, and add several forces into one.

Use the dot product to find the angle between two lines and the parallel and perpendicular components of a force.

Write a cable or rope force as a Cartesian vector from the coordinates of two points, using position and unit vectors.