Fig. 621.10 Falling Sticks: Six Vectors Provide Minimum
Stability:
- Stick standing alone is free to fall in any direction.
- Two sticks: free to fall in any direction.
- Two sticks joined: free to fall in two directions
and to slide apart at bases.
- Three sticks: free to fall in any direction.
- Three sticks joined: only free to slide apart at
bases.
- Four sticks: a propped-up triangle_the prop is free
to slide out.
- Five members: two triangles may collapse as with
a hinge action.
- Six members: complete multidimensional stability_the
tetrahedron.
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