Amazingly, Wikipedia has an article titled "[List of common misconceptions][1]".  There is a (short) section dedicated to [Physics][2], which mentions:

 - The role of the Coriolis effect in bathtubs and sink drains
 - The role of angular momentum in bicycle stability
 - The "equal time" fallacy in explaining the lift developed by an airfoil
 - Glass isn't actually a high viscosity fluid
 - Composition of air
 - "Lightning never strikes twice"

Some that I would add:

 - "Once something is in orbit it is free from Earth's gravity."  Even educated people get tripped up on this one; the internet is rife with people suggesting we just "nudge" the International Space Station into lunar orbit.  At a much more basic level of misunderstanding, there is the idea that astronauts are "weightless" because they are far away from the earth.

 - "There is a high tide on the opposite side of the earth from the moon/sun because the earth 'shields' the ocean from the gravitational pull."


  [1]: http://en.wikipedia.org/wiki/List_of_common_misconceptions
  [2]: http://en.wikipedia.org/wiki/List_of_common_misconceptions#Physics