Analyzing a perfect physical sphere in space I see it having two kinds of movements, one will be defining the center position of the sphere in 3D space with a velocity that will not change unless there is a force, and the other is the rotation of the sphere, this is the part that i still dont fully understand.
What i think is that this rotation will have 3 axis and like the translation has a velocity that doent change without a force, the sphere will have too a velocity of rotation defined in those three axis that doesnt change unless there is a force.
After seeing how the earth moves around the sun I can say that a perfect sphere in space is not limited to rotate around a fixed axis.
Can I describe all possible ways a sphere can rotate (forever unless there is a force) defining a velocity in those 3 axis?
Edited by lomateron, 11 January 2013 - 01:28 AM.