Apparatus Competition

2007 AAPT Summer Meeting

Greensboro, NC

 

A simple apparatus for use in determining the diameter and location of a hidden circular cavity

 

A. James Mallmann

Department of Physics and Chemistry

Milwaukee School of Engineering

1925 North Broadway

Milwaukee, WI   53202-3109

 

414-277-7317

mallmann@msoe.edu

 

Abstract

This simple, inexpensive apparatus, easily constructed using three sheets of fiberboard, is designed to challenge students to accomplish two goals:

       The easier goal is to determine the diameter of a hidden circular cavity.

       The more challenging goal is to determine the location of the center of the hidden circular cavity.

         

Construction of Apparatus:

The three-layer sandwich of one-eighth or one-fourth-inch                                                              

thick fiberboard sheets shown here

is fabricated by gluing together three identically shaped sheets shown in the lower portion of the photo.

   The apparatus will include a single sheet of the fiberboard for use in determining the density of the material.

 

Use of Apparatus:

 

This apparatus will be used by students for the first time during the fall of 2007. We believe that the use of the apparatus by students will have several advantages:

 

 

 

Equipment and costs required to construct apparatus:

Item

Source

Part number

Cost

Fiberboard

Lumberyard or hardware store

               -

<$1.00

Ordinary carpentry tools

 

 

 

 

 

 

 

Total Cost

<$1.00