What is the moment of inertia of a pendulum with a mass of #5 kg# that is #3 m# from the pivot?
Just use the definition of moment of inertia
To appreciate this definition, take a look at its kinetic energy at any given constant,
Since a pendulum swings back and forth, you can measure/observe two kinds of speeds, the speed of the blob (v) and the speed of the angular change over time (
From an utility point of view, it is much easier to measure the angular change over time (
And of course, you can use the concept of angular momentum to appreciate the definition of