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PS-65
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Primary Science Learning Experience
PS–65   Wonky Turntable Runs
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TRY THIS
Spin a ring/disc as you release it. How do you get it to stay rolling on the platform? What affects its motion? Can it stay at the same spot with respect to you? Put it flat on the surface. Where? Does it slip? In which direction? Why?

WHAT IS HAPPENING
The ring/disc moves along paths affected by its own spin and the platform rotation. These interact in the Coriolis Effect acting on it. If it turns at the same platform speed and is properly pointed, it should stay at the same position. But any disturbance (eg friction) will cause it to veer. Veering outwards into the faster moving regions, it is swept along with the platform and quickly rolls off. Veering inwards, it appears to speed up and spiral towards the centre and then falls down flat.
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