Question

So torque equals both Fr and I(rot. accel)?

Answer 1

\[Torque = F(r) = I \alpha\] ?

Answer 2

Can you use them interchangeably in the same equation?

Answer 3

\[\tau = \vec{r}\times\vec{F} = I\alpha\]
but torque is not simply a force. It's a force applied at a distance away from a point of rotation. Note that only the NET torque is equal to I alpha, just as only the net force is equal to ma.

Answer 4

yes , you can use them interchangeably in the same equation?