# Needs New Photo

## C4-11: ACCELEROMETER - BALL IN WATER

Purpose: Demonstrate the direction of acceleration for both linear and circular cases.

## C4-01: AIR TRACK - NEWTON'S SECOND LAW

Purpose: Demonstrate F = ma.

## C3-21: INERTIAL MASS CART

Purpose: Demonstrate the inertial property of mass

## C3-11: STRAW AND POTATO

Purpose: Illustrate inertia of motion

## C3-06: INERTIA: JENGA

Purpose: Demonstrate inertia of rest.

## C2-51: KINEMATICS WITH ULTRASONIC RANGER

Purpose: Plot graphs of position, velocity, and acceleration

## C2-24: WATER DROP PARABOLA

Purpose: Demonstrate the parabolic path of a projectile.

## C2-23: TRAJECTORY OF A BALL - MODEL

Purpose: Illustrate the position of a projectile at equal time intervals

## C2-10: CONSTANT VELOCITY - GALILEO'S EXPERIMENT

Purpose: Show constant velocity and uniform acceleration using a rolling body.

## C2-09: FREE FALL WITH STROBE

Purpose: Show the position of a dropped ball at a series of equal time intervals

## C2-04: FREE FALL WITH PHOTOCELL GATES

Purpose: Measure acceleration due to gravity

## C2-03: AIR TRACK - UNIFORM ACCELERATION - INCLINED

Purpose: Measure acceleration along an inclined air track.

## C2-02: AIR TRACK - DIRECT MEASUREMENT OF ACCELERATION

Purpose: Measure acceleration using two different procedures

## C1-21: AIR TABLE - TOPPLING STICK

Purpose: Illustrate how a rigid rod topples on a frictionless surface.

## C1-13: AIR TRACK - REDUCED MASS

Purpose: Demonstrate the change in frequency for two-body oscillations.

## C1-12: AIR TRACK - CENTER OF MASS OF COUPLED GLIDERS

Purpose: Demonstrate uniform motion of the center of mass of an oscillating system.

## C1-11: AIR TRACK - CENTER OF MASS PENDULUM

Purpose: Show uniform motion of the center of mass of a vibrating pendulum/glider system.

## C1-04: CENTER OF MASS - BEAR ON TIGHT ROPE

Purpose: Show stability in system where the center of mass is outside of the object.

## C1-03: CENTER OF MASS MOTION - CLOWN

Purpose: Illustrate rotation about the center of mass of an irregular object.

## N1-31: SUN DOG - MODEL

Purpose: Show how a "sun dog" is formed.
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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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