# Needs New Photo

## B3-01: LEVER AND LOADED WAGON

Category: B3 Simple Machines
Purpose: Demonstrate the mechanical advantage of a lever

## B2-43: CRANE BOOM

Purpose: Demonstrate a crane boom

## B2-42: ARM MODEL

Purpose: Model the forces occurring in the arm

## B2-36: EQUILIBRIUM OF TORQUES ON METERSTICK - ROTATORS

Purpose: Demonstrate equilibrium of torques

## B2-35: EQUILIBRIUM OF TORQUES ON METERSTICK

Purpose: Demonstrate equilibrium of torques

## B2-34: EQUILIBRIUM OF TORQUES - ANGLE BRACKET

Purpose: Verify the equation for torques when the center of mass is outside the object

## B2-33: EQUILIBRIUM OF TORQUES - SMALL

Purpose: Demonstrate equilibrium of torques

## B2-31: EQUILIBRIUM OF TORQUES - WHEELS AND AXLES

Purpose: Demonstrate equilibrium of torques

## B2-21: CONCEPT OF TORQUE - TORSIONAL CHAIR

Purpose: Introduce the concept of torque

## B2-14: SUM OF FORCES - LARGE ROPE VERSION

Purpose: Develop a feel for equilibrium of forces on a large scale

## B2-12: EQUILIBRIUM OF FORCES - BOARD BACKGROUND

Purpose: Demonstrate equilibrium of forces

## B2-11: EQUILIBRIUM OF FORCES - OHAUS PROJECTION

Purpose: Demonstrate equilibrium of forces

## B2-04: VERTICAL FORCES - FOUR SPRING SCALES

Purpose: Show addition of forces along a line

## B2-03: EQUILIBRIUM OF FORCES - INCLINED PLANE

Purpose: Demonstrate equilibrium of forces

## B2-02: SUM OF FORCES - SPRING SCALES

Purpose: Show that the sum of forces exerted on the mass by the scales is constant

## B2-01: SUM OF FORCES IN A LINE

Purpose: Demonstrate that forces in one dimension add algebraically

## B1-24: CENTER OF MASS - CARTS ON BALANCE BOARD

Purpose: Show that the center of mass may remain at rest during motion within the system.

## B1-22: CENTER OF GRAVITY USING TEETER TOTTER

Purpose: Determine the center of gravity of the human body

## B1-21: BALANCE BEAM - VARIATION ON THE TIGHTROPE WALKER

Purpose: Show how arms or a pole are used to obtain greater stability

## B1-17: CENTER OF MASS - STICKS

Purpose: Illustrate the center of mass in a surprising way
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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

• #### 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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