# Needs New Photo

## B1-17: CENTER OF MASS - STICKS

Purpose: Illustrate the center of mass in a surprising way

## B1-12: CENTER OF MASS - HINGED STICK PARADOX

Purpose: Illustrate the center of mass in a surprising way

## B1-11: BALANCE MAN

Purpose: Illustrate stable equilibrium

## B1-09: CENTER OF MASS - TRIANGLE

Purpose: Demonstrate the process of locating the center of mass

## B1-07: DOUBLE CONE - SMALL

Purpose: Demonstrate a center of mass paradox

## A2-32: HEIGHT MEASUREMENT BY TRIGONOMETRY

Category: A2 Mathematics
Purpose: Determine the height of a student using trigonometry

## A2-23: VECTOR PRODUCT

Category: A2 Mathematics
Purpose: Illustrate the product of two vectors

## A2-21: MAGNETIC VECTOR BOARD

Category: A2 Mathematics
Purpose: Demonstrate properties of vectors

## A2-15: HYPERBOLOID FROM STRAIGHT LINES

Category: A2 Mathematics
Purpose: Approximate the hyperboloid

## A2-12: SLATED SPHERE

Category: A2 Mathematics
Purpose: Demonstrate rotation and spherical geometry

## A2-11: CIRCUMFERENCE VS. DIAMETER - CHAIN ON CYLINDER

Category: A2 Mathematics
Purpose: Show the relationship between the diameter and the circumference of a circle

## A2-02: XYZ AXES ON EXTENDED HANDLE

Category: A2 Mathematics
Purpose: Aid in discussing angular momentum

## A2-01: CARTESIAN COORDINATE AXES

Category: A2 Mathematics
Purpose: Illustrate a standard right-handed cartesian coordinate system

## D5-13: FOCAULT PENDULUM - MODEL

Purpose: Model the Foucault pendulum

## O1-01: EYE MODEL - OPTICS

Purpose: Demonstrates optics of the eye and corrections of optical defects

## L3-16 FOCUSING OF HEAT WAVES BY MIRRORS

Category: L3 Curved Mirrors
Purpose: Demonstrates that concave mirrors can focus heat waves

## K2-03 FARADAY'S EXPERIMENT ON INDUCTION

Purpose: Demonstrates the induction between two coils

## H4-04 FOURIER ANALYSIS - DIGITAL OSCILLOSCOPE

Category: H4 Music
Purpose: Demonstrates the Fourier spectrum of complex waves

## G3-53 STANDING WAVES IN A STRING

Purpose: Demonstrates standing waves on a thin string

## D1-61: Rolling versus Sliding

Purpose: Applies conservation of energy to a rolling object
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• #### D3-01 MASSES SLIDING ON ROTATING CROSSARM

Illustrates conservation of angular momentum Read More
• #### D3-02: MASS ON STRING - ORBITS WITH VARYING RADIUS

Illustrates conservation of angular momentum Read More
• #### D3-03 ROTATING CHAIR AND WEIGHTS

Illustrates conservation of angular momentum Read More
• #### D3-04: ROTATING STOOL AND WEIGHTS

Demonstrate conservation of angular momentum. Read More
• #### D3-05 ROTATING CHAIR AND BICYCLE WHEEL

Illustrates conservation of angular momentum Read More
• #### D3-06: ROTATING CHAIR - HELICOPTER MODEL

Demonstrate conservation of angular momentum Read More
• #### D3-07: ROTATING PLATFORM

Demonstrate rotational kinematics and inertia. Read More
• #### D3-12: SWING MODEL

Model the pumping of a swing using conservation of angular momentum. Read More
• #### D3-21: INVERSE SPRINKLER - GLASS MODEL

This is a non-working sprinkler that was used for data in an American Journal of Physics paper. Read More
• #### D3-22: INVERSE SPRINKLER - METAL MODEL

Demonstrate the Feynman inverse sprinkler effect. Read More
• #### D3-31: AIR TABLE - TETHERBALL

Show qualitatively an example of non-conservation of angular momentum. Read More
• #### D3-32: KEYWHIP

Demonstrate angular momentum conservation in a surprising way. Read More
• #### D3-33: Centripetal Acceleration - Rotating Ball and Brick

Illustrate centripetal force and its relationship to velocity and radius. Read More
• #### D3-41: AIR TABLE - RECTANGULAR PUCK COLLISIONS

Qualitatively show conservation of angular momentum in collisions of a circular puck with a rectangular puck. Read More
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