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1Q40.30 - Rotating Chair and Bicycle Wheel

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​1Q40.30 - Rotating Chair and Bicycle Wheel

Title1Q40.30 - Rotating Chair and Bicycle Wheel

To demonstrate angular momentum.

Assembly Instructions

The rotating chair sits on a wheeled movable base and is covered in a plastic dust cover. Remove the cover and wheel the appartus into its position in the classroom in front of the lecture bench. Tip the chair over onto its back to be able to remove the wheeled base. There are three plastic cups that mount on the metal screws at the base of the chair (these are necessary for lecture hall use). Place one cup on each screw and carefully bring the chair back to its upright position. You may have to adjust the screws so that the chair is level and doesn't turn on its own. Once it is level, one may sit on the chair and buckle themselves up for a fun, safe ride. 

Get the rotating bike wheel and place it on its stand. Clamp the spinning base to the table top.

Setup Time10
Operation Time5
Preview Time5
Operation Instructions

Remove or secure all loose articles of clothing to avoid getting them caught in the wheel. Start the large bicycle wheel spinning. There is an internal clutch in the bike wheel, so place the wheel on the spinning base and roll the knurled handle back and forth between your palms. Then, holding the wheel so that it is rotating in a vertical plane, sit on the chair. If you now turn the wheel so it is rotating in a horizontal plane, you will rotate in the opposite direction than the wheel. Turn the wheel back to vertical and you will stop. Flip the wheel in the opposite direction and the demonstration is reversed.

Demo on DimeNo
PIRA 200Yes
Export Instructions (if different)
Our export version consists of a wooden turntable.  Stand on the turntable and proceed like on the rotating chair.
The export bike wheel has no internal clutch, so you'll have to spin it up manually.
Category1 Mechanics
Subcategory1Q - Rotational Dynamics
Keywordsbike wheel
Construction Information
The wheel is well balanced and it should be kept filled with air to a pressure of about 50 psi.
rotating chair
floor protector disk
transport cart for rotating chair
gyro bicycle wheel