[url=https://phet.colorado.edu/sims/projectile-motion/projectile-motion_en.html]Link to Simulation[/url] (requires flash)[br][br]This simulation demonstrates projectile motion. Choose a projectile to launch, along with its launch parameters. Air resistance can be enabled to see how much of an effect it has. The target and tape measure can be repositioned.[br][br][list=1][*]Does the mass of the projectile matter when air resistance is ignored? What if there is air resistance?[/*][*]With launch speed fixed, what angle maximizes range? What angle maximize time in the air?[/*][*]Try to hit the target.[/*][*]Without moving the target, can you hit it again using different launch parameters?[/*][/list][br]Credits:[br]PhET Interactive Simulations[br]University of Colorado Boulder[br]https://phet.colorado.edu