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2. Constant-force spring - Wikipedia

   en.wikipedia.org/wiki/Constant-force_spring

   An ideal constant-force spring is a spring for which the force it exerts over its range of motion is a constant, that is, it does not obey Hooke's law.In reality, "constant-force springs" do not provide a truly constant force and are constructed from materials that do obey Hooke's law.

3. Hooke's law - Wikipedia

   en.wikipedia.org/wiki/Hooke's_law

   In physics, Hooke's law is an empirical law which states that the force (F) needed to extend or compress a spring by some distance (x) scales linearly with respect to that distance—that is, F s = kx, where k is a constant factor characteristic of the spring (i.e., its stiffness), and x is small compared to the total possible deformation of the spring.

4. Spring (device) - Wikipedia

   en.wikipedia.org/wiki/Spring_(device)

   The rate or spring constant of a spring is the change in the force it exerts, divided by the change in deflection of the spring. That is, it is the gradient of the force versus deflection curve. An extension or compression spring's rate is expressed in units of force divided by distance, for example or N/m or lbf/in.

5. Series and parallel springs - Wikipedia

   en.wikipedia.org/wiki/Series_and_parallel_springs

   Equivalent Spring Constant (Series) When putting two springs in their equilibrium positions in series attached at the end to a block and then displacing it from that equilibrium, each of the springs will experience corresponding displacements x 1 and x 2 for a total displacement of x 1 + x 2. We will be looking for an equation for the force on ...

6. Belleville washer - Wikipedia

   en.wikipedia.org/wiki/Belleville_washer

   Belleville spring stack in series Belleville spring stack in parallel. Multiple Belleville washers may be stacked to modify the spring constant (or spring rate) or the amount of deflection. Stacking in the same direction will add the spring constant in parallel, creating a stiffer joint (with the same deflection).

7. Torsion spring - Wikipedia

   en.wikipedia.org/wiki/Torsion_spring

   Determining the force for different charges and different separations between the balls, he showed that it followed an inverse-square proportionality law, now known as Coulomb's law. To measure the unknown force, the spring constant of the torsion fiber must first be known. This is difficult to measure directly because of the smallness of the ...