An easy way for a high school class to prove this would be to remove a broom stick from your broom. Drill a hole in the center of the end, install a lag screw into hole cut the head off the screw. Now chuck a cordless drill motor up. Now pull the trigger as fast as you can and feel how little rotational resistance and how quickly it reaches top RPM. Very little resistance felt and up to speed quickly.. REMOVE CUT OFF LAG SCREW!! Now drill a 3/8 hole in the middle of its length, install 3/8 bolt into the hole, tighten the nut and bolt so the handle will not spin on the bolt. Be sure to use a bolt long enough for the same drill motor to chuck up to. Pull the trigger feel the rotational force act apon your wrist how long did it take to reach top speed? Much more force and much longer. Smaller counter weight good. Larger bad even if its same weight. Class dismissed.
