How do I plot purely symbolic functions?

Thanks Simon, I didn't know that it was possible to write a loop like that.  I've seen my textbook's plots of functions who's amplitudes are made up of undefined constants; the textbook then shows a plot who's vertical axis' units are multiples of the undefined amplitude of the function.  So the first tic mark on the plot would read F/mw, the second tic would read 2F/mw, the third tic would read 3F/mw, etc.  The author of the book stated that the plots in the book were made using MathCad, so I'm not assuming Mathematica can do this also.  Thanks for the reply!