Accepted Answer
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.
Suggested Answer
it is the hand that holds the broomstick when you sweep
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