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Information about this web site => Request for physics Simulations => Topic started by: nobody_12 on November 14, 2011, 04:31:00 pm



Title: simulation request: Circular Motion and Work
Post by: nobody_12 on November 14, 2011, 04:31:00 pm
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 (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


Title: Re: simulation request: Circular Motion and Work
Post by: lookang on November 15, 2011, 03:50:03 pm
Perhap you could attached your simulation in jar or ejs source format so that it is easy for others to help you.

The more you describe your problem the more others can understand what you want to do with your simulation mOdel

Good luck


Title: Re: simulation request: Circular Motion and Work
Post by: nobody_12 on November 15, 2011, 11:37:24 pm
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 (http://www.megaupload.com/?d=PNZH6H51)
sorry for megaupload, but i didnt find any way to upload it right here


Title: Re: simulation request: Circular Motion and Work
Post by: nobody_12 on November 19, 2011, 10:50:38 pm
nobody can help me? i really need it


Title: Re: simulation request: Circular Motion and Work
Post by: lookang on November 21, 2011, 02:25:28 am
you can check out
http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=1892.0
it is the same model that you are looking at.


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.


Title: Re: simulation request: Circular Motion and Work
Post by: nobody_12 on November 23, 2011, 12:54:59 am
thx, now i have one more problem, how can i achieve mircular motion about fixed axis in 2D?


Title: Re: simulation request: Circular Motion and Work
Post by: lookang on November 23, 2011, 08:04:52 pm
Your simulation is rotating around a fixed point in 2D.
Can you explain/show your question with a diagram your request?


Title: Re: simulation request: Circular Motion and Work
Post by: nobody_12 on November 24, 2011, 09:00:22 pm
here is applet with the motion i need :http://zamestnanci.fai.utb.cz/~schauer/contents/mechanics/two_d_kinematics/ex3_6.html (http://zamestnanci.fai.utb.cz/~schauer/contents/mechanics/two_d_kinematics/ex3_6.html)
i mean the rotating wheel.


Title: Re: simulation request: Circular Motion and Work
Post by: favorito on January 16, 2012, 03:27:31 pm
 El seleccionador espa?ol reitera y no se cansa que ganar un Mundial es muy, muy difícil, puesto que "hay 31 rivales y algunos de ellos tienen tan buen nivel o mejor que el nuestro" La labor del seleccionador Vicente del Bosque de cara al Mundial 2010 es tan técnica como psicológica, y él lo sabe. Por eso reitera una y otra vez que Espa?a no debe sentirse de puertas para adentro favorita ni mejor
-*-


Title: simulation request Circular Motion and Work
Post by: Femida on March 14, 2015, 12:30:42 am
Excuse for that I interfere … But this theme is very close to me. I can help with the answer.