[updraught]

Originally Posted by Joe K

And - the so called "friction" shocks are still available.

https://en.wikipedia.org/wiki/Fricti...shock_absorber

https://www.speedwaymotors.com/Speed...ocks,3799.html

Still in some use among the hot-rod crowd. One can actually "tune" these quite well to get to the "vibration neutral point."
Joe K

"The damping rate for frictional dampers has less than ideal behaviour for car suspension. An ideal suspension would offer more damping to greater suspension forces, with less damping at low speeds for a smoother ride. Frictional dampers though had a mostly constant rate. This was even greater when stationary, owing to stiction between stationary plates.[1][10] For larger bumps the damping may even be reduced. This is particularly a problem for fast driving, when repeated high forces may cause the friction plates to heat up and lose their efficiency."

In leaf springs, the diagram looks like coil springs, there is already a fair bit of friction.