Re: [Phys-l] buoyancy on a submerged pole

[Chuck Britton <cvbritton@embarqmail.com>]

I HOPE that you don't tell your students that the chair's upward 
contact force is the N3 partner to your own weight = mg.

	This is a common teaching error that gets into some texts.
	and MANY classrooms.

At 4:09 PM -0400 11/5/10, Chuck Britton wrote:
> How do you 'explain' the contact force?
> How does your chair 'know' how much upward force to exert.
> Is the chair an 'agent'?
>
>
> At 3:59 PM -0400 11/5/10, Anthony Lapinski wrote:
> > I tell my students that every force must have a source!
>
> and it must be part of a 'pair' of forces.
>
> go on, please - tell me about the mathematical box analysis.
>
> thanks
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