 name="l00374"></a><span class="lineno">  374</span>&#160;        <span class="comment">! Compute the friction force</span></div>
<div class="line"><a name="l00375"></a><span class="lineno">  375</span>&#160;        f = (kz * z + bz * dzdt + viscous * velocity) * normal</div>
<div class="line"><a name="l00376"></a><span class="lineno">  376</span>&#160;    <span class="keyword">end function</span></div>
<div class="line"><a name="l00377"></a><span class="lineno">  377</span>&#160; </div>
<div class="line"><