# Needs New Photo

## F2-23: BUOYANCY PARADOX - INVERTED BLOCK

Category: F2 Buoyancy
Purpose: Illustrate buoyancy in a paradoxical way.

## F2-22: BUOYANCY PARADOX - ACCELERATED FRAME

Category: F2 Buoyancy
Purpose: Illustrate dramatically the concept of buoyancy.

## F2-11: HYDROMETER

Category: F2 Buoyancy
Purpose: Measure the density of a liquid.

## F2-10: BUOYANT BUBBLES

Category: F2 Buoyancy
Purpose: Demonstrate buoyancy and diffusion in an interesting way.

## F2-04: BUOYANCY - SPHERE AND WATER

Category: F2 Buoyancy
Purpose: Challenge the students' thinking about the buoyant force by considering the question: "Will a round object, without a flat top and bottom surface, experience a buoyant force, as does a cylinder?"

## F2-03: CARTESIAN DIVER - EXPLICIT VERSION

Category: F2 Buoyancy
Purpose: Demonstrate explicitly how a cartesian diver works by showing how the water enters the diver when the pressure in the cylinder is increased.

## N3-41: SPLITTING OF SPECTRUM INTO COMPLEMENTARY COLORS

Category: N3 Color
Purpose: Show complementary colors by removing a band from the white light spectrum.

## N3-33: MAXWELL'S EXPERIMENT - THREE-COLOR MIXING

Category: N3 Color
Purpose: Demonstrate three-color mixing with positive colors.

## N3-31: COLOR SEPARATION TRANSPARENCIES

Category: N3 Color
Purpose: Illustrate color mixing of negative color transparencies.

## F1-21: LIPLESS STRAW

Purpose: Demonstrate the role of atmospheric pressure in the operation of a drinking straw.

## F1-15: PRESSURE GLOBE

Purpose: To illustrate several interesting phenomena related to air pressure

## F1-14: PISTON DIAMETER VS TRAVEL - WORKING MODEL

Purpose: Show that with an incompressible fluid the bigger piston moves more slowly than the smaller piston.

## D5-24: ROTATING PENDULA - LENGTH VS. HEIGHT

Purpose: Show that pendula of different length suspended from the same point rotating at the same angular speed rise to the same vertical height.

## D5-23: ROTATING BEAD ON LOOP

Purpose: Demonstrate the presence of a "critical parameter" which determines the dynamic behavior of a simple physical system.

## D5-22: ROTATING PENDULUM

Purpose: Demonstrate the presence of a "critical parameter" which determines the dynamic behavior of a simple physical system.

## D5-21: BALL ROLLING ON ROTATING DISC

Purpose: Show that a sphere rolling on a rotating disc will move in circles.

## F1-13: CONSTANT WATER PRESSURE

Purpose: Demonstrate a mechanism which produces a constant water pressure.

## F1-12: PASCAL'S LAW - COILED TUBE PARADOX

Purpose: Illustrate Pascal's law in a dramatic way.

## D5-12: CORIOLIS EFFECT - WATER JET

Purpose: Model the Coriolis effect.

## D5-11: CORIOLIS EFFECT - BALL ON ROTATING PLATFORM

Purpose: Illustrate the Coriolis effect.
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• #### 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

• #### E2-23: 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

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

• #### E2-53: 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