Recall in the previous section that setting a different reference axis will yield you a different moment of inertia (MoI). What if you already know the MoI with respect to one axis, but you would like to find out the MoI with respect to another axis?
Well this is what the parallel-axis theorem is all about. It’s a theorem to help us transfer the axis for our MoI. The formula is pretty simple:
Recall in the previous section that setting a different reference axis will yield you a different moment of inertia (MoI). What if you already know the MoI with respect to one axis, but you would like to find out the MoI with respect to another axis?
Well this is what the parallel-axis theorem is all about. It’s a theorem to help us transfer the axis for our MoI. The formula is pretty simple:
Note:
This topic is a very important one, and historically students struggle with this topic. But not to worry, let’s look at a simple example to illustrate this concept.
Note:
This topic is a very important one, and historically students struggle with this topic. But not to worry, let’s look at a simple example to illustrate this concept.