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A
suspension bridge works by pulling on either end of the valley that
it’s located on. This pulling action is called tension.
This suspension bridge has only one compression member. That’s
the green pole in the middle. All the rest of the members are
tension members. That would include the white string that’s
holding all the little poles, as well as all the little poles
holding up all the little babies.
If there
are no ends to pull against, then the bridge will fail. Because we
don’t want to injure the babies, we will gently lower them to the
surface by easing the tension on one end. Dr. Bear is on hand in case
there is an accident.
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