Hooke's Law Model by PhET

Hooke's Law Model by PhET.
made a post http://iwant2study.org/ospsg/index.php/interactive-resources/physics/02-newtonian-mechanics/03-dynamics/255-hookes-law-model-by-phet

awesome #HTML5 stuff, i don't have to make this one myself. i can refer to it when teachers need it.

http://iwant2study.org/ospsg/index.php/interactive-resources/physics/02-newtonian-mechanics/03-dynamics/255-hookes-law-model-by-phet
https://phet.colorado.edu/en/simulation/hookes-law