The following advert, tho well done and exhibits physical principles, is also very misleading, and, therefore, perhaps harmful if not accompanied by a discussion. It's currently being praised by members of a HS physics list, who will class room use it.
Here's the link:
YouTube - Record
Also posted here:
The Blog of Phyz
Am I wrong? I calc. the I (orJ) to be about five million kg m^2 [assuming the skater is two meter tall the ice disk has a radius of fifteen m and is > 0.05 m thick. Two inch ice will not support a walking person -- the skater is more than walking!] Also the dissipation must be enormous!
Near the end the disclaimer: "Screen images simulated"** is in very small type -- I didn't see it until the fourth viewing and no poster has mentioned it -- one suggest it might be "real"; the others haven't commented.