spring in solidworks ..its used as motion.it will be more helpfull

its assembly of screw jack & its motion done by solidworks...mostly use with mechanical mates.

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The SolidWorks Surface Design & Modelling Course teaches you the fundamentals of surface design, and you can also practice on real projects and models. Some of the subjects we cover inlcude the application of surfacing tools, sketching techniques for complex, free-form shapes, generation and modification of complex free-form shapes and more; then we step you through a variety of complex models in detail, and you can practice on your own with the part files. This is applicable to later versions of SolidWorks.