Friction
The force of two things rubbbing together
Link
http://www.engineeringinteract.org/resources/parkworldplot/flash/concepts/friction.htm
http://www.engineeringinteract.org/resources/parkworldplot/flash/concepts/friction.htm
http://www.tutorfi.com/Science/frictionforchildren
http://www.channel4learning.com/sites/essentials/science/physical/friction_bi.jsp
http://www.explainthatstuff.com/lubricants.html
http://www.historyforkids.org/scienceforkids/physics/machines/friction.htm
http://www.whyzz.com/what-is-friction
http://www.physics4kids.com/files/motion_friction.html
Video
http://www.youtube.com/watch?v=pWPPofu6iqs
http://www.youtube.com/watch?v=a5SOCxYft20&feature=related
http://www.youtube.com/watch?v=YT20Yi34xRk&feature=related
http://www.youtube.com/watch?v=TkXAJHitPAY&feature=related
http://www.youtube.com/watch?v=L8Hx6Vn9eXE&feature=related
http://www.youtube.com/watch?v=7N_drdBrNMU&feature=related
http://www.youtube.com/watch?v=sfyBjM2ZO0M&feature=related
http://hyperphysics.phy-astr.gsu.edu/hbase/fricon.html
http://scienceworld.wolfram.com/physics/Friction.html
http://www.school-for-champions.com/science/friction_resources.htm
Interactive Games
http://www.sciencekids.co.nz/gamesactivities/friction.html
http://www.bbc.co.uk/schools/scienceclips/ages/8_9/friction.shtml
http://www.engineeringinteract.org/resources/parkworldplot/flash/concepts/friction.htm
http://pbskids.org/sid/funwithfriction.html
http://www.bbc.co.uk/schools/scienceclips/ages/8_9/friction.shtml