Where is the fulcrum of a broom?

It is the hand that holds the broomstick when you sweep

It's one of your hands. Which one it is depends on how you sweep.

- - If you hold the top of the stick motionless and wave your bottom hand

back and forth, then your top hand is the fulcrum, and you're using the

broom as a Class-3 lever.

- - If you hold your bottom hand motionless and wiggle the top end of the

broom back and forth with your top hand, then your lower hand is the fulcrum,

and you're using the broom as a Class-1 lever.