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Balloon Propeller (Newton's Third Law)

Balloon Propeller (Newton's Third Law)
Messiness: Low
Age Range: 5y - 9y
Estimated Time: <30 mins

Activity Designer

Stephanie Sims
167 Projects

Sir Isaac Newton's Third Law of motion says that for every action, there is an equal and opposite reaction. Using everyday materials, your kids can see this concept come to life!

How We Did It

Balloon Propeller (Newton's Third Law)

"D'you guys remember this one?" I asked.

"No," answered my daughter Trev. "Is it a gravity experiment?"

"Nope! Newton's Third... do you remember which law that is?" And so it began....

Balloon Propeller (Newton's Third Law)

First, Trev stretched the balloon by hand and blew it up a bit to stretch it out further.

The next step is to tape the balloon to the end of the straw (the opposite end of the bendy part). There needs to be a good seal, so I did that part myself.

Balloon Propeller (Newton's Third Law)

"Where does it balance? Can you find the balance point?" I asked.

Trev put the straw on her finger and figured out at what point the straw balanced. Excellent. When the balance point of the straw was found, she poked the pin all the way through the straw (both sides)...

Balloon Propeller (Newton's Third Law)

and poked the pin into the top of the pencil's eraser.

Balloon Propeller (Newton's Third Law)

She spun the straw around the top of the pencil several times to stretch the pinhole a bit (you want to get the pinhole nice and loose so that the straw can spin easily).  Then she blew up the balloon.

Balloon Propeller (Newton's Third Law)

Once the balloon was filled with air, Trev held on to the pencil and watched the balloon fly! There was definitely lots to talk about: "Remember Newton's third, now?" "What did you do to the balloon?" "Why does the air come out? And why does it spin?"

Air, energy, actions, and reactions. Excellent. Simple and effective!

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My child and I completed Balloon Propeller (Newton's Third Law) .

posted by: suhail on 10.12.2013

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