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whats a good design for a mini balsa wood bridge? it has to hold 100 pounds!? Answered

must have:

mass- 45.0 grams or less
length- must be longer than 38.0 centimeters (2.0 cm by 2.0 cm square rod must be able to pass through full length of roadway surface)
height & depth- can't extend more than 12.0 cm above test support surface and 10.0 cm below it.
roadway- will support 100lbs load, cannot be more than 2.0 cm above test support surface

BRIDGES CAN'T BE WEDGED INTO SUPPORTS)

someone please help, i'm stuck!

Discussions

triangles.

Tetrahedrons - there's no requirement in the spec for traffic to be able to actually cross the bridge.

no, just the hollow passage - no 'deck' required per se. tetrahedrons for the win.