Physics Help Forum Force/pressure exerted from rubber band

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 Feb 3rd 2011, 07:19 AM #1 Junior Member   Join Date: Feb 2011 Posts: 1 Force/pressure exerted from rubber band If you stretch a rubber band around a pole, the band exerts a force onto the surface of the pole (F1 in figure 1). Is it possible to calculate this force if I know the force needed to stretch the rubber band to the same total length as the circumference of the pole? That is to say: 1. I know the force F2 in figure 2 2. The total length of the rubber band is the same in figure 1 and figure 2 Can I calculate the force F1? Is it meaningful to talk about force, or should one talk about the pressure instead? Attached Thumbnails
Feb 3rd 2011, 01:37 PM   #2

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 Originally Posted by pryphnoq If you stretch a rubber band around a pole, the band exerts a force onto the surface of the pole (F1 in figure 1). Is it possible to calculate this force if I know the force needed to stretch the rubber band to the same total length as the circumference of the pole? That is to say: 1. I know the force F2 in figure 2 2. The total length of the rubber band is the same in figure 1 and figure 2 Can I calculate the force F1? Is it meaningful to talk about force, or should one talk about the pressure instead?
The force on an object such as a rubber band closely obeys Hooke's Law for springs which states that |F| = kx where k is a constant and x is the "stretch" of the spring (the amount you have puuled the spring from its equilibrium length.)

-Dan
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