spring
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A spring is an elastic mechanical device that can be bent, stretched, or compressed and will return to its original shape when released. Springs matter because they store and release energy in countless everyday applications, from car suspensions and mattresses to pens and door hinges.
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Force (F) vs extension (s). Spring characteristics: (1) progressive, (2) linear, (3) degressive, (4) almost constant, (5) progressive with knee A machined spring incorporates several features into one piece of bar stock Battery contacts often have a variable spring
A spring is a device consisting of an elastic but largely rigid material (typically metal) bent or molded into a form (especially a coil) that can return into shape after being compressed, extended or twisted. Springs can store energy when compressed, when extended, and/or when twisted. In everyday use, the term most often refers to coil springs, but there are many different spring designs. Modern springs are typically manufactured from spring steel. An example of a non-metallic spring is the bow, made traditionally of flexible yew wood, which when drawn stores energy to propel an arrow.