# Tension force

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1. Dec 21, 2014

### Za Kh

what is the difference between the tension force of the rope and that of spring ??

2. Dec 21, 2014

### Staff: Mentor

Can you give some context for your question?

3. Dec 21, 2014

### Za Kh

why one of them is considered conservative force and the other isn't ?

4. Dec 21, 2014

### Staff: Mentor

Springs are generally modeled as being elastic and following Hooke's law. So a potential energy function can be defined: $PE = \frac{1}{2}k x^2$.

Ropes, on the other hand, are generally modeled as being inelastic and inextensible. (Obviously a simplification, as real ropes often do stretch appreciably under load.)

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