Rees, Peter <br/><br/>
Why do swings swing? and other questions about forces 

 - Cambridge :  Cambridge University Press,  2010 
 - 16 p. :   col. ill.  
<br/><br/><label>ISBN: </label>9780521137201 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Dynamics<br/>Force and energy
<br/><br/><label>Dewey Class. No.: </label>530.11  / R328