Broom balance science demonstration | Fizzics Education


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Broom balance trick

Broom balance trick

Follow FizzicsEd 150 Science Experiments:

You will need:

One broom


Broom balance science experiment - a regular broom
1 Broom balance science experiment - balancing the broom with arms apart

Spread your hands as far apart as you can along the broom.

Pick up the broom using only one finger of each hand… it’ll be heavy on the broom end.


2 Broom balance science experiment - balanced broom

Slowly slide you fingers together at the same speed.

You will find that the finger close to the broom head doesn’t move much compared to other finger.

Once you get your fingers together you have found the broom’s centre of gravity.

3 Broom balance science experiment -bringing fingers together when balancing the broom

Can you balance the whole broom using one finger on that point?

Try other odd shaped objects, e.g. baseball bats, golf clubs and hockey sticks… be careful!

Try repeating the experiment, only placing your hands in a different spot.

Do you find the centre of gravity each time no matter what?

4 A man pointing at a bicycle wheel spinning horizontally on a desk (balancing by itself)

Get the Unit of Work on Forces here!

  • Push, pull
  • Friction & spin!

From inertia to centripetal force, this unit covers many concepts about Newton’s Laws!

Includes cross-curricular teaching ideas, student quizzes, a sample marking rubric, scope & sequences & more

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5 A child balancing a plastic bird on his nose
6 Teacher showing how to do an experiment outside to a group of kids.

Online courses for teachers & parents

– Help students learn how science really works

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Why Does This Happen

Every object has a centre of gravity, only it is in a different place for different shaped objects.
The centre of gravity is where the mass of the object is equally balanced. By sliding your fingers along the bottom of the broom, you found the natural centre of balance.


Centre of balance is critically important to everything that moves (or stands still!). From spinning ice skaters to spaghetti towers,  understanding where your centre of balance can be found makes a huge difference.

  • If you lean too far forward you will start to fall… why? Because most of your mass is away from your centre of gravity, causing you to fall to the ground. Living things very quickly learn about their centre of balance when they’re learning to move.
  • Engineers and builders use the centre of balance when designing machines, buildings, bridges and more. 
  • The centre of balance in a rock formation determines whether a landslide will occur.
  • If you’ve ever overstacked your dishes in the sink, you’ve watched the impact of centres of balance as your dishes fall!

Variables to test

More on variables here

  • Try different brooms, does this demonstration work every time?
  • What happens if you pull off the end of the broom?
  • Try this with other things such as a kayak paddle, a mop, a rake and so on.

A man with a glove above a liquid nitrogen vapour cloud

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