NTNUJAVA Virtual Physics Laboratory
Enjoy the fun of physics with simulations!
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Author Topic: Action Force and Reaction Force  (Read 15313 times)
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Fu-Kwun Hwang
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on: April 28, 2009, 12:26:19 am » posted from:Taipei,T\'ai-pei,Taiwan

This applets is designed to test your understanding about action force and reaction force.
You can  drag two hand with mouse.
The force exists when both hands touch two sides of the spring and the length is different from the original length.
There are two pairs of action force and reaction force ( all shown as arrow with different color).
Please identify those two pairs of action and reaction force.

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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!

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Reply #1 on: May 07, 2009, 04:16:33 pm » posted from:Härnösand,Vasternorrlands Lan,Sweden

Newtons 3rd law is very nonexistent in the simulation universe. So I was interested to see this one.

When I noticed that a UK physics assessment test had lots of questions about reactive forces I tried to make a simulation in a nice simulator called Particle World. Unfortunately it is not a free program but I got permission to have a copy:


In the starting simulation you can see many bodies with different masses and speeds in 1-dim collisions. All had identical springs to show the forces involved. You can change to the same but with English labels with File>predefined>Newtons3je>8 cases speeds masses

I have a bunch of exercises to follow through but they are only in Swedish.

It is possible to Export / import simulations into this applet. And it is fun to play with. You can grab things with your mouse too and throw them around.

It ought to be easy to make something similar with Physlets or EJS.

jeff forssell
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