# Spinning Toroid shaped objects

In our class we were playing with a toroid shaped object made of foam (Probably). While tossing it around, not only was the disc rotating simply. It was well, sort of vibrating. Like one end of the object is up and the other is down then after a small interval the vice versa occurs. What is the main cause of this phenomena ? Is this an example of a toroid shaped example.

Thank you.

Related Other Physics Topics News on Phys.org
In our class we were playing with a toroid shaped object made of foam (Probably). While tossing it around, not only was the disc rotating simply. It was well, sort of vibrating. Like one end of the object is up and the other is down then after a small interval the vice versa occurs. What is the main cause of this phenomena ? Is this an example of a toroid shaped example.

Thank you.

I have a personal theorem: if it can vibrate in some way, then it will.

Khashishi
I think we need more detail on what you observed. How long was this torus in the air? How dense is this foam? Could air resistance be a factor? How symmetric is the shape?

It was symmetric, there were no visible signs of damage. Torus was in the air for perhaps maximum 1-2 seconds, we were throwing it from one end of the class to the other The distance it traveled was about 10 - 15m. Density of the foam is something I can't comment but it was as squishy as a tennis ball. Can't comment about air resistance. It was non porous, and did not seem to be hollow.

Khashishi
I'd say distance traveled was too short to make any clear conclusion without sophisticated equipment.

I will try at larger distances tomorrow when we go back to school.. Thank you :)