Coin

1
Coin

• TMF 2004
• Gymnasium Eliky Krásnohorské

2
Conditions

• transitional motion is neglected.
• coin is ideal ring (cylinder)
• coin hasnt a relief it is flat
• the basis for the motion is ideally straight

3
Heavy flywheel

• coin is a heavy flywheel
• point of touch coin with basis O is moving
• only centre of gravity isnt moving
• the angle ? is magnified

4
Motion of flywheel
5
Motion of flywheel

• it is pseudoregular preccesion
• the axe is moving across the cycloid curve
• nutation is magnified
• rotation about main axe is accelerated

6
Observation

• instead of observing a coin we can observe an
  object approximating to ideal ring (cylinder)
  for example compact disc
• bigger objects are moving slower and so is easier
  observable