# Rotational Dynamics

## D1-55: ROTATING ELASTIC RINGS

Purpose: Demonstrate "centrifugal reaction" and to indicate why the earth is oblate.

## D1-43: INERTIAL FORCES - BALLS IN ROTATING JARS

Purpose: Demonstrate inertial forces in bodies submerged in air and in water.

## D1-42: ROTATING WATER BUCKET WITH SPONGE

Purpose: Illustrate centripetal force and centrifugal reaction with a trick.

## D1-40: CENTRIPETAL FORCE ON ROTATING RUBBER BAND

Purpose: Demonstrate centripetal force and centrifugal reaction.

## D1-39: PENNY AND COAT HANGER

Purpose: Demonstrate centripetal force and centrifugal reaction in a dramatic way.

## D1-36: AIR TABLE - CENTRIPETAL FORCE

Purpose: Show that centripetal force varies with angular velocity.

## D1-32: TRAJECTORY FROM CIRCULAR ORBIT

Purpose: Show that the instantaneous velocity of an object executing uniform circular motion is tangent to the circle.

## D1-31: TRAJECTORY FROM SPIRAL

Purpose: Show that forces are required to create circular motion.

## D1-30: TRAJECTORY FROM CIRCULAR ORBIT - OVERHEAD PROJECTOR

Purpose: Show that the instantaneous velocity of an object executing uniform circular motion is tangent to the circle.

## D1-21: ANGULAR VELOCITY - OBERBECK CROSS

Purpose: Measure the angular velocity of a rotating object.

## D1-12: ADDITION OF ANGULAR VELOCITIES

Purpose: Illustrate the complex motion resulting from addition of two angular velocities.

## D1-11: CYCLOID - LIGHT BULB ON WHEEL

Purpose: Demonstrate cycloidal motion.

## C7-44: COLLISIONS - HOVERPUCKS

Category: C7 Collisions
Purpose: Demonstrate two-dimensional collisions.

## C7-42: AIR TABLE - COLLISIONS OF PUCKS

Category: C7 Collisions
Purpose: Qualitatively demonstrate elastic and inelastic two-dimensional collisions.

## C6-12: SKIDDING AUTOMOBILE

Category: C6 Friction
Purpose: Demonstrate the effect of locked wheels on vehicle stability.

## C4-13: ACCELEROMETER ON ROTATOR

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

## 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

## D4-22: MONORAIL CAR

Category: D4 Gyroscopes
Purpose: Demonstrate gyroscopic stability

## D5-13: FOCAULT PENDULUM - MODEL

Purpose: Model the Foucault pendulum
Page 4 of 6
• #### F4-01: VISCOSITY OF LIQUIDS

Compare the viscosities of water and mineral oil. Read More
• #### F4-02: VISCOSITY OF AIR

Demonstrate that air is viscous. Read More
• #### F4-04: SILLY PUTTY

Demonstrate a non-Newtonian fluid. Read More
• #### F4-05: PARACHUTE TOY

Demonstrate how a parachute quickly reaches its terminal velocity. Read More
• #### F4-11: LAMINAR AND TURBULENT FLOW OF AIR

Demonstrate laminar and turbulent flow. Read More
• #### F4-12: UNMIXING - GLYCERIN AND DYE

Illustrate laminar flow by "unmixing" two fluids Read More
• #### F4-13: FLUID FLOW MODEL

For use as a model in developing equations for fluid flow. Read More
• #### F4-14: WIND TUNNEL

Show air flow around different objects. Read More
• #### F4-21: LIQUID IN SPINNING SPHERE

Show the behavior of a liquid when subjected to a centripetal force. Read More
• #### F4-22: SPINNING WATER BUCKET

Illustrate the reaction force on spinning water and the shape of the water surface. Read More
• #### F4-23: WATER PENDULUM

Show the surface of a container of water in a swinging pendulum. Read More
• #### F4-25: CYCLONE IN A BOTTLE

Illustrate vorticity in a perhaps tricky way. Read More
• #### F4-31: SIPHON

Illustrate how a siphon works. Read More
• #### F4-32: SIPHON - CHAIN MODEL

Illustrate how a siphon works. Read More
• #### F4-33: PYTHAGOREAN CUP

Demonstrate the siphon in a surprising way. Read More
• #### F4-34: SIPHON BALANCE

Demonstrate properties of the siphon using a counterintuitive example. Read More
• #### F4-41: DRUM AND CANDLE

Demonstrate the circular vortex. Read More
• #### F4-42: SMOKE RINGS USING GARBAGE CAN

Create large smoke rings and illustrate the circular vortex. Read More
• #### F4-51: VACUUM PUMP MODEL

Illustrate how a mechanical vacuum pump works. Read More
• #### F4-52: FORCE PUMP - MODEL

Demonstrate the operation of a force pump. Read More
• #### F4-53: ARCHIMEDES' SCREW

Demonstrate a pump mechanism invented by Archimedes. Read More
• #### F4-61: HERO'S FOUNTAIN

Illustrate fluid dynamics in a perhaps surprising way. Read More
• #### F4-63: MARIOTTE'S BOTTLE

Show the range of water jets from different heights along a water column. Read More
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