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<p>complexity of the interactions involved makes the calculation of friction from <a href="page.php?w=first_principle">first principle</a>s difficult, and it is often easier to use <a href="page.php?w=empirical_method">empirical method</a>s for analysis and the development of theory.</p>

<p><big>Types</big></p>
<p>There are several types of friction:<br/>
* <b>Dry friction</b> is a force that opposes the relative lateral motion of two solid surfaces in contact. Dry friction is subdivided into static friction ("<a href="page.php?w=stiction">stiction</a>")</p><p>
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