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Easy Java Simulations (2001- ) => Collaborative Community of EJS => Topic started by: lookang on February 14, 2015, 12:26:12 pm

 Title: EJSS 2 Cannon aim at each other Projectile Motion Model m=1kg, g=-9.81m/s^2 Post by: lookang on February 14, 2015, 12:26:12 pm EJSS 2 Cannon aim at each other Projectile Motion Model m=1kg, g=-9.81m/s^2[lookangframe name=projectile2cannon]http://weelookang.blogspot.sg/2015/02/ejss-2-cannon-aim-at-each-other.htmldifferent trails from y1=0 to 10 showing the deterministic collision always occurrun: https://dl.dropboxusercontent.com/u/44365627/lookangEJSworkspace/export/ejss_model_projectile2cannon/projectile2cannon_Simulation.xhtmloffline: https://dl.dropboxusercontent.com/u/44365627/lookangEJSworkspace/export/ejss_model_projectile2cannon.zipscr: https://dl.dropboxusercontent.com/u/44365627/lookangEJSworkspace/export/ejss_src_projectile2cannon.zipauthor: lookang, Fu-Kwun Hwangauthor EJSS 5.0: Francisco EsquembreSimulation embeddedsound file taken from http://www.freesfx.co.uk/sfx/bouncingreferencing from http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=144.0based on a eariler model i made http://weelookang.blogspot.sg/2014/09/ejss-projectile-customized-after.html Question:do you know why the cannonball always hit each other provided they point at each other and velocities are pointed towards each other and greater than zero?Answer :is conceptually in the green line being without the effects of gravity, the cannons ball will meet as predicted by Newton's 1st Law of motion without net external force.now, adding the same gravitational acceleration means both cannon balls will move down at the same rate ( pink lines).therefore, the 2 cannon balls has to collide .