Question
Sat July 14, 2012 By: Avi Wadhwa
 

why does a spring exert force when extended or compressed? Why don't a coil of thread show the same behaviour?

Expert Reply
Sat July 14, 2012
It is beause of the material properties of the spring. Some materials show resistance on change of their crystal structure. It is due to this behaviour that springs exert force.
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