Re: [Phys-L] kinematics objectives

["John Clement" <clement@hal-pc.org>]

How about coffee filters.  2 stuck together fall faster than 1.  Coffee
filters fall nicely right side up.

John M. Clement
Houston, TX 

> You can do the same thing. With paper plates. I do 1 vs 10. 
> The result is obvious even after a meter
>
> Joe
>
> Sent from my iPhone
>
> On May 9, 2013, at 9:43 PM, Bill Nettles <bnettles@uu.edu> wrote:
>
> > I have demonstration in which I "prove" that Aristotle is 
> right about heavier objects falling faster.  I have three 
> squares 10 cm x 10cm: one of cardboard, one of aluminum and 
> one of lead. I drop them in pairs, flat side facing the 
> ground. Lead wins every time.  You have to drop from about 
> 2.5  meters to make it obvious that it hits before the 
> aluminum.  Then we talk about air resistance, shape profiles, 
> and a_air=F_air/m so that the more massive object has less 
> acceleration upward due to air.  Then I take two sheets of 
> paper, let them both drift to the floor, then crumple one and 
> release them again.
> > I've tried dropping the squares with the edges facing down, 
> but the cardboard flips too easily.
> >