- #1
Karol
- 1,380
- 22
Homework Statement
Two equal, parallel and opposite forces at at both sides of a horizontal disk that lies on a smooth table, according to the picture.
The mass is m and the moment of inertia is: kmR2
Angular momentum round the center point A:
[tex]2FR=kmR^2 \cdot \alpha[/tex].
Angular momentum round the point B on the outer edge:
[tex]2FR=mR^2(k+1) \cdot \alpha[/tex].
It is clear i will get 2 different angular acceleration [itex]\alpha[/itex], how come?
Homework Equations
M=I[itex]\alpha[/itex]
Shteiner's theorem of the parallel axis:
Ib=Ic+mb2
The Attempt at a Solution
It is clear that the second equation is wrong, since the first one is right, since it is round a static point.
Maybe i have to compensate, when calculating round point B, for it's acceleration?
How? maybe with D'alamber's sentence?
But then, can i solve only from the point of view of the accelerating system?
I want to solve from the static, inertial system.