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The most important medicine is tender love and care. ..."Mother Teresa(1910-1997, Roman Catholic Missionary, 1979 Nobel Peace Prize)"

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 Author Topic: simulation request: Circular Motion and Work  (Read 12317 times) 0 Members and 1 Guest are viewing this topic. Click to toggle author information(expand message area).
nobody_12
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 « Embed this message on: November 14, 2011, 04:31:00 pm » posted from:ZlÃ­n,Zlinsky kraj,Czech Republic

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
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lookang
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http://weelookang.blogspot.com

 « Embed this message Reply #1 on: November 15, 2011, 03:50:03 pm » posted from:SINGAPORE,SINGAPORE,SINGAPORE

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
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nobody_12
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 « Embed this message Reply #2 on: November 15, 2011, 11:37:24 pm » posted from:-,-,CZECH REPUBLIC

ok, here is my incomplete applet and i need it to work same way like the example i posted previously
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 » Logged
nobody_12
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 « Embed this message Reply #3 on: November 19, 2011, 10:50:38 pm » posted from:-,-,CZECH REPUBLIC

nobody can help me? i really need it
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lookang
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 « Embed this message Reply #4 on: November 21, 2011, 02:25:28 am » posted from:SINGAPORE,SINGAPORE,SINGAPORE

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.

Embed a running copy of this simulation

Embed a running copy link(show simulation in a popuped window)
Full screen applet or Problem viewing java?Add http://www.phy.ntnu.edu.tw/ to exception site list
Press the Alt key and the left mouse button to drag the applet off the browser and onto the desktop. This work is licensed under a Creative Commons Attribution 2.5 Taiwan License
• Please feel free to post your ideas about how to use the simulation for better teaching and learning.
• Post questions to be asked to help students to think, to explore.
• Upload worksheets as attached files to share with more users.
Let's work together. We can help more users understand physics conceptually and enjoy the fun of learning physics!
 « Last Edit: November 21, 2011, 02:29:38 am by lookang » Logged
nobody_12
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 « Embed this message Reply #5 on: November 23, 2011, 12:54:59 am » posted from:-,-,CZECH REPUBLIC

thx, now i have one more problem, how can i achieve mircular motion about fixed axis in 2D?
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lookang
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 « Embed this message Reply #6 on: November 23, 2011, 08:04:52 pm » posted from:Mountain View,California,United States

Your simulation is rotating around a fixed point in 2D.
Can you explain/show your question with a diagram your request?
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nobody_12
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 « Embed this message Reply #7 on: November 24, 2011, 09:00:22 pm » posted from:-,-,CZECH REPUBLIC

here is applet with the motion i need :http://zamestnanci.fai.utb.cz/~schauer/contents/mechanics/two_d_kinematics/ex3_6.html
i mean the rotating wheel.
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favorito
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 « Embed this message Reply #8 on: January 16, 2012, 03:27:31 pm » posted from:Fuzhou,Fujian,China

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
-*-
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Femida
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 « Embed this message Reply #9 on: March 14, 2015, 12:30:42 am » posted from:,,Satellite Provider

Excuse for that I interfere … But this theme is very close to me. I can help with the answer.
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The most important medicine is tender love and care. ..."Mother Teresa(1910-1997, Roman Catholic Missionary, 1979 Nobel Peace Prize)"