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: '''Springs''' can be extended and compressed.
: '''Springs''' need two opposing [[force]]s to change length.
{| class="wikitable"
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|[[File:SpringForcesEquilibrium.png|center|300px]]
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| style="height:20px; width:200px; text-align:center;" |The spring will stretch to a certain length and then stay the same due to two opposing [[force]]s.
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: If one [[force]] were bigger than the other the spring would [[accelerate]] rather than stretch.
===Oscillating Springs===