how do kenetic and potential energy effect a basic pendulum? How does gravity effect it?

Question

Since this is not my area of expertise, I searched Google under the key words "pendulum kinetic potential energy gravity" to get these possible sources:

http://galileo.phys.virginia.edu/classes/581/MostlyPE.html
(Broken Link Removed)
http://www.glenbrook.k12.il.us/gbssci/phys/CLass/energy/u5l2bb.html
http://66.102.7.104/search?q=cache:8Zm6BrMgYJ0J:www.rowan.edu/colleges/las/physicsandastronomy/LabManual/labs/EnergyPendulum2.pdf+pendulum+kinetic+potential+energy+gravity&hl=en&gl=us&ct=clnk&cd=6&client=safari
http://66.102.7.104/search?q=cache:Dv74yRMRXu0J:www.louisvillescience.org/pdf/Grade6_Design_a_Pendulum_Activity.doc+pendulum+kinetic+potential+energy+gravity&hl=en&gl=us&ct=clnk&cd=9&client=safari
http://66.102.7.104/search?q=cache:Qydc426H6gAJ:www.fsea.org/pdf/questions/PC1QA.pdf+pendulum+kinetic+potential+energy+gravity&hl=en&gl=us&ct=clnk&cd=10&client=safari

I hope this helps. Thanks for asking.