Re: [Phys-L] inertia and the tablecloth demo

["Bob Sciamanda" <treborsci@verizon.net>]

-----Original Message----- 
It was written:
> Our syllabus describes frcition as  a force that opposes motion.

> > Where's That From?????

> I ask how could we move if there was no friction?

> > Good question!  The syllabus doesn't make any sense.
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Friction opposes the relative motion of surfaces in contact -
it opposes slipping of your feet when you walk -
it opposes slippage of the tires as a car accelerates.
When motion of the contact point is thus impeded momentum is transferable 
into other, allowed motion.

Bob Sciamanda
Physics, Edinboro Univ of PA (Em)
treborsci@verizon.net
www.sciamanda.com