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Elastic Spring Force - Compression vs Extension

x = 0 represents spring at rest ( when it is neither extended or compressed)
Fs is the direction of the elastic spring force of the spring

The top diagram shows that when a spring is extended (pulled), the spring will pull back (indicated by Fs going to the left) 

The bottom diagram shows that when a spring is compressed (pushed), the spring will push back (indicated by Fs going to the right)

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