60;        <span class="keywordflow">if</span> (abs(velocity) &lt;= eps) <span class="keywordflow">then</span></div>
<div class="line"><a name="l00169"></a><span class="lineno">  169</span>&#160;            f = (mu * normal / eps) * velocity</div>
<div class="line"><a name="l00170"></a><span class="lineno">  170</span>&#160;        <span class="keywordflow">else</span></div>
<div class="line"><a name="l00171"></a><span class="lineno">  171</span>&#160;            f = mu * normal * sign(1.0d0, velocity)</div