The cantilevers of atomic force microscopes are approximated as these devices.
"Negator" varieties of these devices exert constant force over their entire range of motion. They are attached to magnets in seismometers. The cantilevers of atomic force microscopes are approximated as these devices. To determine the density of the earth, Cavendish employed a torsional example of these devices, which can be used in hanging balances. Like that of capacitors, the namesake constant of these devices adds linearly in parallel. That constant has units of Newtons per meter and is multiplied by the negative of displacement to find the restoring force exerted on these devices in a law that relates stress and strain. For 10 points, name these sources of elastic energy whose stretching is described by Hooke's law.
"Negator" varieties of these devices exert constant force over their entire range of motion.
coiled springs [prompt on simple harmonic oscillators]