LARGE ROTARY PLATFORM
mechanics
Description of the device
Large rotating platform demonstrates the effect of centrifugal force.
Phenomenon
When you walk on the platform in one direction, the platform rotates in the opposite one. It’s the result of the principle of conservation of angular momentum, which depends on mass, size and rotational speed of the system – and is equal 0 unless an external force is applied to the system. To stay on the spinning platform, you need to lean towards its middle. That position balances all the forces that act on your body, including the centrifugal force that is trying to “throw you off” the platform.
How to use it
Stand on the perimeter of the still platform. Start walking alongside the perimeter. What happens? Stop. Try walking in the opposite direction. Stand on the edge of the platform. Ask someone to spin it. Notice, what position you need to take to stay on the spinning platform. When the platform rotates, try to walk alongside its diameter, from one edge to another.