If, like us, you've essentially repressed everything you were told in GCSE physics, other than how to mess around with magnets, then firstly, welcome.
Secondly, these posters might help you out a bit. The very talented Justin Van Genderen has created a set of four designs to educate us on the fundamental forces of the known universe. Luckily, they look pretty damn nice too.
You can pick them up here.