Hi to everyone, i started to do this simulation as my school project, but now i am stuck a really need your help. I was able to program the circular motion but really dont know how to involve gravitation effects in it. Simulation should lool kile this one : http://zamestnanci.fai.utb.cz/~schauer/contents/mechanics/work/ex6_5.html I really appreciate any help, but if you dont have time to create whole applet, formulas with gravitation will be sufficient

ok, here is my incomplete applet and i need it to work same way like the example i posted previously http://www.megaupload.com/?d=PNZH6H51 sorry for megaupload, but i didnt find any way to upload it right here

« Last Edit: November 15, 2011, 11:43:51 pm by nobody_12 »

your applet can be uploaded using the Upload new EJS jar file. option at the bottom when you post (select ejs_XXX.jar from file folder,where XXX is ejs project name)

http://zamestnanci.fai.utb.cz/~schauer/contents/mechanics/work/ex6_5.html Exploration 6.5: Circular Motion and Work A 1-kg black ball is constrained to move in a circle as shown in the animation (position is given in meters, time is given in seconds, and energy on the bar graph is given in joules). In the animation the wire is vertical and the ball is subjected to gravity (downward as usual), as well as the force of the wire. You may set the initial velocity and then play the animation. The blue arrow represents the net force acting on the mass, while the bar graph displays its kinetic energy in joules. Restart.

Set the speed fast enough to get the ball over the top. Then restart and examine forces at positions near say -45o and 45o (hanging straight down is –90o). Label your forces as Fg (gravity), Fwire, and Fnet. Given your force diagrams there are positions where the speed of the ball is changing more rapidly than others. Take each of the positions you considered and rank them from highest tangential acceleration to lowest. Assume that the ball can get to y = 10 m. How much kinetic energy does the ball lose in going from y = -10 m to y = 10 m? Is this independent of v0x initial? What is the work done by gravity when the ball goes from y = -10 m to y = 10 m? Determine the minimum speed that the ball must have to go over the top. Once you have an answer check it using the animation.

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