Here is a link for a pdf file which provides help with section B of A level Physics (9702). Probably wouldn't have got an A* in Physics had I not found this booklet.
http://www.scribd.com/doc/19493819/A-Level-Physics-Application-Booklet-9702
http://www.scribd.com/doc/19493819/A-Level-Physics-Application-Booklet-9702