====== FRICTION (is not a force): ======
=== Friction & Mechanical Advantage ===
{{youtube>mUL-swYDIZE?640x360|Mechanical Advantage & Friction}}
=== Video: Mechanical Advantage & Friction ===
  * IF UNABLE TO ACCESS YOUTUBE VIDEO (requires Flash) TRY:[[http://viewpure.com/mUL-swYDIZE|Mechanical Advantage & Friction]]