# Needs New Photo

## B3-02: LEVERS - THREE CLASSES

Category: B3 Simple Machines
Purpose: Demonstrate the three classes of levers

## 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
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• #### O1-01: EYE MODEL - OPTICS

Demonstrate the optics of the eye and corrections of optical defects. Read More
• #### O1-02: EYE OPTICS MODEL - INDIVIDUAL VIEWING

Show inversion of the image on the retina by the eyelens. Read More
• #### O1-03: IMAGE INVERSION ON RETINA

Model image inversion on the retina. Read More
• #### O1-04: IMAGE INVERSION ON RETINA - INDIVIDUAL VIEWING

Individual demonstration of image inversion on retina. Read More

• #### O1-11: TEST OF NEARSIGHTEDNESS VS. FARSIGHTEDNESS

Identify nearsighted and farsighted eyes using laser speckle. Read More

• #### O1-22: SPHERICAL ABERRATION IN EYE USING PINHOLE

Show spherical aberration in eye and its correction. Read More