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March 29, 2015

March 29, 2015

Posted by **Danielle** on Tuesday, April 1, 2008 at 1:17am.

a). An overhead garage door has two springs, one on each side of the door. A force of 15 pounds is required to stretch each spring 1 foot. Because of a pulley system, the springs stretch only one-half the distance the door travels. The door moves a total of 8 feet, and the springs are at their natural length when the door is open. Find the combined lifting force applied to the door by the springs when the door is closed.

- Math -
**bobpursley**, Tuesday, April 1, 2008 at 7:19amHookes Law:

Forceeachspring=kx

=15/1 * x

and x will be 1/2 *8

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