# Relation between dash pot and spring in forces when extracting a transfer function [closed]

If a spring load some energy and use it for opposing other forces, and a dash pot has a friction, physically the both shouldn't have the same force-displacement equation ?

In most of dash pots, we could find an inner spring right ?

• Spring force is proportional to displacement; add a dashpot and you introduce a force proportional to velocity (derivative of displacement); add a mass and you introduce a force proportional to acceleration (derivative of velocity, and 2nd derivative of displacement). And these systems are, respectively, 0th order, 1st order and 2nd order. A similar relationship exists for resistor; inductor; capacitor. – Chu Jun 30 '18 at 7:39
• ... derivative = multiply by s in Laplace TF. – Chu Jun 30 '18 at 8:16
• I don't see how this is related to EE... – Sven B Jun 30 '18 at 15:29
• I'm voting to close this question as off-topic because this has nothing to do with EE – MCG Jul 11 '18 at 12:33