UTF-8Intro to Modeling/MW: Using the model to do experiments.241240246111org.concord.modeler.text.LineIcon750.03010105<html>
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<font face="Verdana, Arial, Helvetica, sans-serif" size="5" color="#FFFFFF"><strong>Intro to Modeling/MW:</strong> Using the model to do experiments.</font>
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<td><img src="motionMainIdea.png" width="98" height="58"></td>
<td><font size="4" face="Verdana, Arial, Helvetica, sans-serif">The biggest advantage to using computer models is that you can modify the <a href="script:page:0:message factors.html">factors which can affect the model</a>, allowing you to do experiments that would be either impossible or too costly to do. Using a model of global climate change scientists could, for example, see what would happen if all the rainforests in the world were cut down? How would that affect global temperatures 50 years from now? Computer models can help answer these questions. </font></td>
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<font face="Verdana, Arial, Helvetica, sans-serif" size="4">At the
beginning of this activity we talked about using a computer model to help
design a superball. So far, we have only been able to run the model but
have not been able to change any of the factors that might affect how the
ball would behave. Below, a few controls have been added to let you try
some experiments with different superball designs or putting the superball
in different environments.</font>
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<font face="Verdana, Arial, Helvetica, sans-serif" size="4">Experiment
with the controls to see how they affect the model. </font>
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<font face="Verdana, Arial, Helvetica, sans-serif" size="4">To give the
ball a new velocity:</font>
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<ul>
<li>
<font face="Verdana, Arial, Helvetica, sans-serif" size="4">click on
the change-velocity button ( <img src="setVelocity.gif" height="13" width="13">
) above the model</font>
</li>
<li>
<font face="Verdana, Arial, Helvetica, sans-serif" size="4">click on
the ball</font>
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<font face="Verdana, Arial, Helvetica, sans-serif" size="4">then drag
the red diamond to set the velocity </font>
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</ul>
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<font face="Verdana, Arial, Helvetica, sans-serif" size="4">To change
the other controls, drag the sliders found below the model.</font>
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<font face="Verdana, Arial, Helvetica, sans-serif" size="4">By
changing the elasticity slider you can design different kinds of
superballs, and by changing the friction and gravity sliders, you
can try out your ball in different environments. Using the info to
the right, design a ball for the Earth environment. Then try making
the environment like that on the moon to see how the ball would
behave for those astronauts who might take your superball with them.</font>
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<img src="earthMoon.gif" height="95" width="216">
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<font face="Arial, Helvetica, sans-serif" size="4"><strong>What is similar
and what is different about the way the ball bounces on Earth and on the
Moon?</strong></font>
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