# Needs New Photo

## G4-12: STANDING WAVES ON A SOAP FILM

Purpose: Demonstrate standing waves in a circular membrane.

## C5-51: BALLISTOCARDIOGRAPHY

Purpose: Demonstrate the science of ballistocardiography

## C5-41: HOURGLASS PROBLEM

Purpose: Demonstrate the solution to the famous "hourglass problem," or Galileo's water bucket

## C5-31: AIR TRACK - SAILING UPWIND

Purpose: Show how force components can be used to sail against the wind.

## C5-20: PUTT PUTT STEAM BOAT

Purpose: Demonstrate action-reaction using an intriguing device.

## C5-16: HERO'S ENGINE

Purpose: Demonstrate action and reaction in a rotational system.

## C5-11: AIR TRACK - ACTION-REACTION PAIRS

Purpose: Demonstrate Newton's third law of motion

## C5-01: NEWTON'S THIRD LAW - STATIC DYNAMOMETERS

Purpose: Demonstrate action-reaction in the static case

## L1-22: OPTICAL BOARD - PINHOLE CAMERA

Purpose: Demonstrate how a pinhole "image" is formed.

## C4-61: ACCELERATION ON A SCALE

Purpose: Illustrate forces in an accelerating system.

## C4-43: TERMINAL VELOCITY - STACKED COFFEE FILTERS

Purpose: Illustrate terminal velocity quantitatively.

## C4-41: TERMINAL VELOCITY - BOTTLE IN TUBE

Purpose: An easily observable terminal velocity experiment.

## C4-32: FREE FALL IN VACUUM - DISK AND FEATHER

Purpose: Demonstrate that bodies of extremely different densities fall with equal acceleration in the absence of air friction.

## C4-31: AIR TRACK - THE ACCELERATION OF GRAVITY

Purpose: Experimentally determine the acceleration of gravity.

## C4-23: ATWOOD MACHINE WITH HEAVY PULLEY

Purpose: Illustrate the affect of a heavy pulley on the Atwood Machine.

## C4-22: HORIZONTAL ATWOOD MACHINE

Purpose: Demonstrate the Horizontal Atwood Machine quantitatively.

## C4-15: HELIUM BALLOON IN ACCELERATED BOX

Purpose: Illustrate the affect of density on acceleration in a counterintuitive way.

## C4-14: AIR TRACK - ACCELEROMETER

Purpose: Demonstrate the behavior of a liquid accelerometer.

## C4-13: ACCELEROMETER ON ROTATOR

Purpose: Show that the surface of a rotating liquid assumes a parabolic shape.

## C4-12: ACCELEROMETER ON INCLINED PLANE

Purpose: Illustrate the behavior of a liquid accelerometer accelerating down an inclined plane.
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• #### E2-01: WORLD GLOBE

Illustrate the globe Read More
• #### E2-02: MEASUREMENT OF RADIUS OF EARTH

Demonstrate how the radius of the earth can be measured using trigonometry. Read More
• #### E2-03: CRATER FORMATION MODEL

Illustrate how a crater forms as a result of an impact or a blast from below. Read More
• #### E2-11: SOLAR PLASMA MODEL

Mass driver and ring heater show coronal holes and coronal heating. Read More
• #### E2-12: FUSION MODEL

Demonstrate how nuclei attract each other if they come close enough together. Read More
• #### E2-13: SUNSPOT MODEL

Show how sunspots are darker than their surroundings due to lower temperatures. Read More
• #### E2-21: PHASES OF THE MOON

Show the relationship between the phases of the moon and the relative earth-sun-moon positions. Read More
• #### E2-22 UMBRA AND PENUMBRA

Illustrates shadow umbra and penumbra Read More
• #### E2-23: UMBRA AND PENUMBRA - EXTENDED SOURCE

Show umbra and penumbra with an extended source, as in an eclipse. Read More
• #### E2-24: UMBRA AND PENUMBRA - COLOR FILTERS

Identify the source of penumbra regions. Read More
• #### E2-31: SOLAR SYSTEM MODEL

Illustrate the approximate angular disposition of the planets around the sun. Read More
• #### E2-32: EPICYCLE MODEL - PTOLEMAIC SYSTEM OF PLANETS

Illustrate the epicycle nature of Ptolemy's model of the solar system Read More
• #### E2-33: RETROGRADE MOTION

Demonstrate the observation of another planet as seen from the earth. Read More
• #### E2-34: BASIC ORRERY (PLANETARIUM)

Demonstrate the sun-earth-moon spatial relationship and related concepts.. Read More
• #### E2-35: PLANETS - RELATIVE SIZES MODEL

Illustrate the relative sizes of the planets Read More
• #### E2-36: DENSITY STRATIFICATION - FORMATION OF PLANETS

Demonstrates how density stratification (differentiation) in interior of planets occurs. Read More
• #### E2-37: PLATONIC SOLIDS AND KEPLER

Visualize the Platonic solids and Kepler's dream for using them to explain planetary orbits. Read More
• #### E2-41: TRANSPARENT CELESTIAL GLOBE

Illustrate some relationships between the earth, the sun, and certain heavenly bodies Read More
• #### E2-42: TELESCOPE MODEL

Show how a telescope can view any point in the sky using a universal mount. Read More
• #### E2-43: ROTATING STAR FIELD

Show the apparent motion of the night sky. Read More
• #### E2-44: BINARY STAR MODEL

Illustrate the orbital motion of a binary star system. Read More
• #### E2-45: ECLIPSING BINARY STAR MODEL - LIGHTS

Show how we view a rotating binary star. Read More
• #### E2-46: ECLIPSING BINARY STAR MODEL - SPHERES

Illustrate the orbits of stars in an eclipsing binary. Read More
• #### E2-47: TWINKLING STAR

Show how air currents cause the "twinkling" of a star. Read More
• #### E2-48: NON-TWINKLING PLANET

Illustrate why a planet does not "twinkle" like a star. Read More
• #### E2-49: PULSAR MODEL - RADIOWAVES

Show the changing field pattern from a rotating dipole. Read More
• #### E2-50: PULSAR MODEL - FLASHLIGHTS

Illustrate beaming pattern of pulsars and pulsed binary X-ray sources. Read More
• #### E2-51: GRAVITATIONAL COLLAPSE - MODEL

Model gravitational collapse. Read More
• #### E2-53: STELLAR EVOLUTION - HYDROGEN BURNING

Provides models for hydrogen burning to produce helium in stars via the proton-proton chain. Read More
• #### E2-54: REFLECTING TELESCOPE - STRING MODEL

Shows how rays are focused by a standard reflecting telescope. Read More
• #### E2-61: GALAXY MODEL

Illustrate our galaxy. Read More
• #### E2-62: SPIRAL GALAXY - WATER MODEL

Show that "permanent" spiral structure can exist as a wave which moves independently from the fluid Read More
• #### E2-63: EXPANDING UNIVERSE

Demonstrate the concept of the expansion of the universe. Read More

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