Do objects always rotate around center of mass?

[user079622]

The video says the exact opposite of what you claim. The center of rotation is not the CoM when airborne (at 5:33):

Yes they are separated by 2cm, so he has problem with flight/shaking,he made him so he must do some fine tunning.
Wait a second, that mean CoM move in circle, where is centripetal force to do that?

If we say, rotate around CoM then we brake net force non zero rule.
If we say com move around center of rotation, then we dont have centripetal force to do this.
Paradox :)

 

[Dale]

If we say, rotation is around CoM then we brake net force non zero rule.

Or perhaps your analysis of the forces is wrong. Let’s see, which is more likely? The established laws of physics are wrong or a novice missed something important.

Anyway, this is getting both frustrating and pointless. I am going to close this thread.

You are welcome to start another thread on the topic under the following conditions:

1) it contains a clear description of the scenario(s) that you want to analyze

2) it shows your personal effort in analyzing it

3) you state clearly what you need help with to proceed

4) you make no claims that it only rotates about some axis and not any other axis (claiming that is does rotate about some axis is fine, only the claim that it does not rotate about another is problematic)

5) you make no more claims about violations of the laws of physics

Posts that do not meet those requirements will not be accepted.