ocr: REGAINING SHAPE EXTENDED SPRING Springs are often used to hold together al moving object, such as a door, and al fixed one, such as a door frame. When a force moves the objects apart, the spring 1S stretched or squeezed. Releasing the force allows the spring to regain its original shape, which returns the object to its starting point.
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(Dorling Kindersley).iso/principl/qspr/qspr2x.dib/qspr2x.png)