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# Physics....hysteresis in rubber? Watch

1. what is meant by the term hysteresis?
2. Hysteresis refers to the 'loop' in the Force-Extension graph of an elastic material.

Imagine a rubber band; the blue line is the 'loading' or initial stretching of the rubber, the red line is that of the 'unloading' or when you let go.

The area under the curve (force x extension) is equal to the work done. As you can see the area under the unloading curve is smaller than the loading curve, the difference (or the area of the loop) gives the energy lost in heat and a little sound.
3. (Original post by reb0xx)
what is meant by the term hysteresis?
(Original post by bl0b)
Hysteresis refers to the 'loop' in the Force-Extension graph of an elastic material.

Imagine a rubber band; the blue line is the 'loading' or initial stretching of the rubber, the red line is that of the 'unloading' or when you let go.

The area under the curve (force x extension) is equal to the work done. As you can see the area under the unloading curve is smaller than the loading curve, the difference (or the area of the loop) gives the energy lost in heat and a little sound.
Strictly speaking, that graph isn't 100% correct, as the graph should be steeper at the beginning and then become less steep, before becoming steeper again. So if you're asked to draw this graph (especially in coursework) make sure you do this accurately, as I lost many marks for this

But at the base of it, the ideas are all still there. The area between the lines shows the energy "lost" due to things like heat. The area under the top line, is the total energy put in and the area under the bottom line is the "useful" energy out. You can get similar things in electromagnetic induction and transformers.

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Updated: December 15, 2010
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