fix_addforce.html
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fix_addforce.html
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			<H3>fix addforce command
			</H3>
			<P><B>Syntax:</B>
			</P>
			<PRE>fix ID group-ID addforce fx fy fz
			</PRE>
			<UL><LI>ID, group-ID are documented in <A HREF = "fix.html">fix</A> command
			<LI>addforce = style name of this fix command
			<LI>fx,fy,fz = force component values (force units)
			</UL>
			<P><B>Examples:</B>
			</P>
			<PRE>fix kick flow addforce 1.0 0.0 0.0
			</PRE>
			<P><B>Description:</B>
			</P>
			<P>Add fx,fy,fz to the corresponding component of force for each atom in
			the group. This command can be used to give an additional push to
			atoms in a simulation, such as for a simulation of Poiseuille flow in
			a channel.
			</P>
			<P>The forces due to this fix are also imposed during an energy
			minimization, invoked by the <A HREF = "minimize.html">minimize</A> command.
			</P>
			<P><B>Restrictions:</B> none
			</P>
			<P><B>Related commands:</B>
			</P>
			<P><A HREF = "fix_setforce.html">fix setforce</A>, <A HREF = "fix_aveforce.html">fix aveforce</A>
			</P>
			<P><B>Default:</B> none
			</P>
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