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2. Garage door - Wikipedia

   en.wikipedia.org/wiki/Garage_door

   The weight of the door may be 400 lb (180 kg) or more but is balanced by either a torsion spring system or a pair of extension springs. [2] A garage door opener is controlled motorized mechanism for opening garage doors adds convenience, safety, and security often used with a remote or a button on wall. [3]

3. Torsion spring - Wikipedia

   en.wikipedia.org/wiki/Torsion_spring

   The force of the spring reverses the direction of rotation, so the wheel oscillates back and forth, driven at the top by the clock's gears. Torsion springs consisting of twisted ropes or sinew, were used to store potential energy to power several types of ancient weapons; including the Greek ballista and the Roman scorpio and catapults like the ...

4. 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.

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