[url=https://phet.colorado.edu/sims/collision-lab/collision-lab_en.html]Link to Simulation[/url] (requires flash)[br][br]This simulation shows 1-D and 2-D collisions that can be completely elastic, completely inelastic, or anything in between.[br][br][list=1][*]What does the "Elasticity" parameter seem to do?[/*][*]Can you make one of the objects stop when the collision is completely elastic? What settings did you need?[/*][*]What about if the collision is completely inelastic?[/*][*]Turn on the center of mass. Just by looking at the motion of the center of mass, can you tell when there's been a collision?[/*][*]The "Advanced" scenario allows for 2-D collisions. Is momentum conserved in both directions (horizontal and vertical)? How does the center of mass move?[/*][/list][br]Credits:[br]PhET Interactive Simulations[br]University of Colorado Boulder[br]https://phet.colorado.edu