- #1
Conductivity
- 87
- 3
I have a little bit of confusion here :c
I don't understand something about torque. I can prove every definition about rotational motion if I assume that a point mass is moving in a circular motion.
and if I also define a point of rotation I don't need an object to rotate in order to have angular momentum because I can think of it having a component of velocity tangential to an "instantaneous" circle.
Everything is good as long as I have a well defined point of rotation. But in the case of for example, a stick with nothing to hold it and I exert 2 forces in the same direction at the ends of the stick. I don't know where to put my point of rotation.
I can make the net torque equal to zero, I can make non-zero all depending on the choice of the point (so it rotates and doesn't :) )
I also read that I should choose the center of mass as my point but why?
Is there is a good book to read from?
I don't understand something about torque. I can prove every definition about rotational motion if I assume that a point mass is moving in a circular motion.
and if I also define a point of rotation I don't need an object to rotate in order to have angular momentum because I can think of it having a component of velocity tangential to an "instantaneous" circle.
Everything is good as long as I have a well defined point of rotation. But in the case of for example, a stick with nothing to hold it and I exert 2 forces in the same direction at the ends of the stick. I don't know where to put my point of rotation.
I can make the net torque equal to zero, I can make non-zero all depending on the choice of the point (so it rotates and doesn't :) )
I also read that I should choose the center of mass as my point but why?
Is there is a good book to read from?