gen x's latest activity

At start of video tennis racket is spinning. Do you agree that racket is rotate around axle that pass through CoM? I see only this...

But these forces are internal, how can we mix internal and external forces when anylize system? Internal forces can't move or rotate...

I don't understand. How you get centripetal force in B, if no force act on ruler after the strike?

My assumption is that the desk is frictionless. Frame fixed to the table: After the strike, the center of mass (CoM) of the ruler will...

It think more is problem what my eyes see when looking at something that rotate about itslef, so I can't understand when you say it...

If center of rotation can not translate per definition, then this hammer not rotate around com from ground frame. Is this ok? The only...

Why is not rigid motion? @jbriggs444 @A.T. How can you throw wheel/stick in the air and force to not rotate around CoM? I think it...

Does that apply to center of revolution as well?

Can we ask where is physical center of rotation of object, does that make more sense?

Question: Answer: Objects always rotate about the lines passing through their CM is only valid when net force=zero? But isn't we say...

Why not?

He talk how objects naturally rotate about their Centers of Mass, from which frame? Do you agree that object tend to rotate about their...

how do you mean?

If origin and axes are fixed to object, then nothing moves, so what I can calculate here? what is point of that frame? What is purpose...