**Date:** Tue, 21 Feb 2012 11:10:16

**Author:** ---

**Subject:** Re: What "Math" Demos among the Physics Demos Do You Like?

**Post:**

--20cf30780ce0ba354604b97ba6eb

Content-Type: text/plain; charset=ISO-8859-1

Hi David,

Three of my favorites "Mathy" demos are;

- Demonstrating that the sum of the angles of a triangle is greater than

180 degrees for triangles in non-euclidean space. A space with constant

positive curvature (sphere) the sum of the angles of a triangle is greater

than 180 degrees. For space with constantly negative curvature (Mexican

hat) the sum total is less than 180.

http://physics.brown.edu/physics/demopages/Demo/astro/demo/8c1060.htm

- Powers of ten - Use a microscope to show a sand grain seated on a mm

reticle for scale. Then show a 1000 ml beaker full of sand. Ask to

calculate the number of sand grains in the beaker.

- Curved Space meets flatland. Take a 1/2 orange peel (positive curve)

and a moist or stale Pringle chip (saddle shape - negative curve). Squash

the curved forms to become flat with the book "Gravitation". Observe the

resulting pattern of deformations of the pieces. The edges of the pringle

pieces tend to overlap. The edges of the orange peel pieces tend to open

wide.

- JZ

Enjoying the warmer-than-average winter this year?

You compatriot in RI, - JZ

On Mon, Feb 20, 2012 at 12:19 AM, David Sturm wrote:

> Greetings, everyone... I'm trying to come up with a list of physics

> demonstrations

> that have very strong advanced mathematics demonstration capability, in a

> side

> project with a couple math teachers.

>

> Obviously, everything in 1A of the DCS is great... but what can you think

> of beyond

> those that are "math" demos?

>

> Feel free to reply to me directly at sturmde@maine.edu off list.

>

> Yes, this has something to do with "Kilonewtonman"... :)

>

> David,

> enjoying a reheated McNewton right now :)

>

> **32d UMaine Physics Teachers Mtg: March 9, 2012

> ====================================================

> David E G Sturm - sturmde@maine.edu - 1.207.478.4937 (cell)

> --Physics & Astronomy Instructional Labs --ATOMIM Board

> --Bennett Hall Lecture Demo --AAPT Apparatus Vice Chair

> --Mainely Physics Show --PIRA Representative

> Physics & Astronomy Dept @ University of Maine

> 5709 Bennett -- Orono ME 04469-5709

> http://www.physics.umaine.edu/

> =============================================

>

>

--

Gerald Zani

Demonstration Manager

Physics

Brown University

(401) 863-3964

--20cf30780ce0ba354604b97ba6eb

Content-Type: text/html; charset=ISO-8859-1

Content-Transfer-Encoding: quoted-printable

Hi David,Three of my favorites "Mathy" demos =

are;Demonstrating that the sum of the ang=

les of a triangle is greater than 180 degrees for triangles in non-euclidea=

n space. A space with constant positive curvature (sphere) the sum of the a=

ngles of a triangle is greater than 180 degrees. For space with constantly =

negative curvature (Mexican hat) the sum total is less than 180.

http://physics.brown.edu/physics/demopages/Demo/astro/demo/8c10=

60.htm=A0=A0Powers of ten - Use a mic=

roscope to show a sand grain seated on a mm reticle for scale. =A0Then show=

a 1000 ml beaker full of sand. =A0Ask to calculate the number of sand grai=

ns in the beaker.

Curved Space meets flatland. =A0Take a 1/2 orange peel (positive curve)=

and a moist or stale Pringle chip (saddle shape - negative curve). Squash =

the curved forms to become flat with the book "Gravitation". =A0O=

bserve the resulting pattern of deformations of the pieces. The edges of th=

e pringle pieces tend to overlap. =A0The edges of the orange peel pieces te=

nd to open wide.

- JZEnjoying the warmer-than-average wi=

nter this year?You compatriot in RI, - JZOn Mon, Feb 20, 2012 at 12:19 AM, David Sturm

Greetings, everyone... I'm trying to com=

e up with a list of physics demonstrations

that have very strong advanced mathematics demonstration capability, in a s=

ide

project with a couple math teachers.

Obviously, everything in 1A of the DCS is great... but what can you think o=

f beyond

those that are "math" demos?

Feel free to reply to me directly at s=

turmde@maine.edu off list.

Yes, this has something to do with "Kilonewtonman"... :)

David,

enjoying a reheated McNewton right now :)

**32d UMaine Physics Teachers Mtg: March 9, 2012

=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=

=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=

=3D=3D

David E G Sturm - sturmde@maine.edu - 1.207.478.4937 (cell)

--Physics & Astronomy Instructional Labs --ATOMIM Board

--Bennett Hall Lecture Demo --AAPT Apparatus Vice Chair

--Mainely Physics Show --PIRA Representative

Physics & Astronomy Dept @ University of Maine

5709 Bennett -- Orono ME 04469-5709

http://www.phy=

sics.umaine.edu/

=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=

=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

-- Gerald Zani<=

br>Demonstration ManagerPhysicsBrown University(401) 863-3964

--20cf30780ce0ba354604b97ba6eb--

From tap-l-owner@lists.ncsu.edu Tue Feb 21 11:16:45 2012

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