A spring is an elastic object that stores mechanical energy. Springs are typically made of spring steel. There are many spring designs. In everyday use, the term often refers to coil springs. When a conventional spring, without stiffness variability features, is compressed or stretched from its resting position, it exerts an opposing force approximately proportional to its change in length.
Torsion generally refers to the angular displacement (amount of twisting) a shaft, rod, or bar experiences as one end is forced, and the other end resists turning. For example, a motor turning an an axle that powers something else (a fan, pump, or beater).
Torsion springs are helical springs that exert a torque or rotary force. The ends of a torsion spring are attached to other components, and when those components rotate around the center of the spring, the spring tries to push them back to their original position.
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