# Needs New Photo

## G1-36: MASS ON SPRING WITH FORCE MEASUREMENT

Purpose: Display the time dependence of the force of a mass oscillating on a spring.

## G1-35: MASS ON SPRING - EFFICIENT MODEL

Purpose: Illustrate the motion of a mass on a spring.

## G1-34: AIR TRACK - SIMPLE HARMONIC MOTION

Purpose: Demonstrate simple harmonic motion of a mass held by two springs.

## G1-32: MASS ON SPRING - WITH STAND

Purpose: Illustrate SHM.

## G1-31: HOOKE'S LAW AND SHM

Purpose: Quantitatively demonstrate how the spring constant affects the period of a mass on a spring.

## G1-18: PENDULUM WITH FORCE SCALE

Purpose: Show the tension in the string exerted by a swinging pendulum.

## G1-17: PENDULUM WITH LARGE-ANGLE OSCILLATION - PORTABLE

Purpose: Illustrate large-angle pendular oscillations and the 360 degree pendulum.

## F4-63: MARIOTTE'S BOTTLE

Category: F4 Fluid in Motion
Purpose: Show the range of water jets from different heights along a water column.

## G1-16: PENDULUM WITH LARGE OSCILLATION

Purpose: Show the difference between pendula with small amplitude and large amplitude of oscillation, and to show rotational motion where the kinetic energy at the top is much less than the change of potential energy from the top to the bottom of the oscillation.

## G1-12: PENDULUM AND ROTATING BALL

Purpose: Demonstrate that simple harmonic motion is the projection of uniform circular motion.

## F4-61: HERO'S FOUNTAIN

Category: F4 Fluid in Motion
Purpose: Illustrate fluid dynamics in a perhaps surprising way.

## F4-52: FORCE PUMP - MODEL

Category: F4 Fluid in Motion
Purpose: Demonstrate the operation of a force pump.

## F4-42: SMOKE RINGS USING GARBAGE CAN

Category: F4 Fluid in Motion
Purpose: Create large smoke rings and illustrate the circular vortex.

## F4-41: DRUM AND CANDLE

Category: F4 Fluid in Motion
Purpose: Demonstrate the circular vortex.

## F4-23: WATER PENDULUM

Category: F4 Fluid in Motion
Purpose: Show the surface of a container of water in a swinging pendulum.

## F4-22: SPINNING WATER BUCKET

Category: F4 Fluid in Motion
Purpose: Illustrate the reaction force on spinning water and the shape of the water surface.

## F4-21: LIQUID IN SPINNING SPHERE

Category: F4 Fluid in Motion
Purpose: Show the behavior of a liquid when subjected to a centripetal force.

## F4-14: WIND TUNNEL

Category: F4 Fluid in Motion
Purpose: Show air flow around different objects.

## F4-05: PARACHUTE TOY

Category: F4 Fluid in Motion
Purpose: Demonstrate how a parachute quickly reaches its terminal velocity.

## F4-02: VISCOSITY OF AIR

Category: F4 Fluid in Motion
Purpose: Demonstrate that air is viscous.
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• #### P2-01: PHOTOELECTRIC EFFECT AND PLANCK'S CONSTANT

Demonstrate the frequency dependence of the photoelectric effect and determine the value of Planck's constant. Read More
• #### P2-02: PHOTOELECTRIC EFFECT IN ZINC - ARC LAMP

Demonstrate the emission of photoelectrons. Read More
• #### P2-03: PHOTOELECTRIC EFFECT IN ZINC - UV LAMP

Demonstrate the emission of photoelectrons. Read More

• #### P2-05: PHOTO-RESISTOR RELAY

Demonstrate operation of a photoresistor. Read More

• #### P2-11: INTERFERENCE OF PHOTONS

Demonstrate two-slit interference of single photons. Read More
• #### P2-12: X-RAY DIFFRACTION MODEL

Show analog between diffraction of light by a two-dimensional grating and diffraction of x-rays by a single crystal. Read More
• #### P2-13: ELECTRON DIFFRACTION

Demonstrates the wave properties of electrons Read More
• #### P2-14: ELECTRON DIFFRACTION MODEL

Analog to diffraction of electrons or x-rays by a powdered crystal. Read More
• #### P2-15: WAVE PACKETS - OSCILLATORS

Show that wave packets begin to form when sinusoidal oscillations with similar frequencies are combined. Read More
• #### P2-20: FLUORESCENCE WITH LASER AND PYLON

Demonstrates change in light color due to flourescence Read More
• #### P2-21 BLACK BODY MODEL

Demonstrates that a cavity is blacker than any surface -- making it a good approximation for an ideal black body Read More

• #### P2-24: GIANT-LIGHT BULB

Demonstrate color and intensity changes of blackbody radiation with temperature. Read More
• #### P2-41: POTENTIAL WELL - HILL TRACK MODEL

Illustrate the concept of a quantum mechanical potential well. Read More
• #### P2-42: PARTICLE IN A BOX - 1D - QM INTRODUCTION

Model behavior of a quantum mechanical one-dimensional particle in a box. Read More
• #### P2-43: CLASSICAL HARMONIC OSCILLATOR - QM INTRODUCTION

Demonstrate the simple behavior of a classical particle moving in a quadratic field. Read More
• #### P2-51: OPTICAL ANALOG OF QM STATES AND OPERATORS

Use properties of optical devices as analogs to illustrate quantum mechanical states and operators. Read More
• #### P2-61: DIRAC STRING TRICK

Illustration of a topological property of the group of rotations. Read More
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