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Old Feb 3rd 2011, 07:19 AM   #1
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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?
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Old Feb 3rd 2011, 01:37 PM   #2
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Originally Posted by pryphnoq View Post
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.)

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