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Newton's Laws at the Atomic Level: The motion of many atoms.
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<font face="Verdana, Arial, Helvetica, sans-serif" size="5" color="#FFFFFF"><strong>Newton's Laws at the Atomic Level:</strong> The motion of many atoms.</font>
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<td><img src="atomMainIdea.png" width="98" height="58"></td>
<td><font face="Verdana, Arial, Helvetica, sans-serif" size="4">How does the motion of many atoms start to approximate Brownian motion?</font></td>
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<font face="Verdana, Arial, Helvetica, sans-serif" size="4">To the right
is a an empty model in which you can place any number of atoms. First, try
adding just two or three atoms, and then trace their paths.</font>
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<font size="4" face="Verdana, Arial, Helvetica, sans-serif"><img height="159" src="addAtomsPanelFlat.png" width="244">
</font>
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<font size="4" face="Verdana, Arial, Helvetica, sans-serif"><strong>Challenge:</strong>
Highlight an atom, and make it behave like <a link_width="400" link_left="10" link_resizable="false" link_menubar="false" link_toolbar="false" target="_blank" link_height="415" href="brownsExperiment.cml" link_top="10" link_statusbar="false">one
of Brown's tiny particles</a> that he observed in his microscope. </font>
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<font face="Arial, Helvetica, sans-serif" size="4"><strong>Why could Brown
come back to his particles over and over again, and always observe that
they were moving in the same way?</strong></font>
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<html>because there were alive</html>
<html>because atoms and molecules are always in continual motion</html>
<html>because atoms and molecules generate their own heat</html>
<html>because vibrations caused by his walking jiggled the atoms</html>
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<font face="Arial, Helvetica, sans-serif" size="4"><strong>Brown's
particles were not single atoms, but they were suspended in water, so they
were surrounded by water molecules. How can something appear to be moving
"randomly" and at the same time follow Newton's first law? </strong>After
answering, <a link_width="450" link_left="10" link_resizable="false" link_menubar="false" link_toolbar="false" target="_blank" link_height="585" href="brownRevealed.cml" link_top="10" link_statusbar="false">reveal
the secret of Brownian motion</a>.</font>
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