Newton’s Laws Experiment with Gravity Beads

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Sometimes the best science lessons are the ones that make everyone stop and say, “Wait… how is that even happening?” Gravity beads are one of those lessons.

This simple demonstration—nothing more than a long strand of plastic beads and a cup—creates a moment of pure wonder. You give the beads a quick tug, and suddenly the entire strand lifts itself into a smooth upward arc and begins pouring out of the cup like a tiny fountain. It looks like a magic trick, but it’s actually a perfect example of Newton’s Laws of Motion happening in real time.

This is the kind of experiment kids remember. It’s quick to set up, dramatic to watch, and incredibly effective for teaching inertia, force, and gravity without needing a full physics lecture. Below, you’ll find a clear explanation of how it works, how to set it up successfully, and ways to extend the lesson for learners of different ages.

Materials You Need

• A long strand of plastic beads (around 50 feet works very well)

• A clear cup or glass

• Optional: a second cup to catch the beads

Christmas bead garlands often work beautifully—many people use those with great success.

How to Set Up the Gravity Bead Experiment

1. Coil the long bead strand neatly into the cup so it won’t tangle.

2. Leave one end hanging out of the cup.

3. Hold the cup high above the ground.

4. Give that hanging end one firm tug.

5. Step back and watch the beads rise upward and pour out in a continuous stream.

For the best view, try filming it in slow motion.

Why This Works: The Science Behind the “Magic”

Inertia keeps the beads moving

Once you pull the end, the beads want to keep moving. This is Newton’s First Law.

Momentum creates the upward arc

Your tug gives the beads an initial upward direction. They continue rising briefly until gravity pulls them back down.

Gravity pulls the falling beads, which pull the next beads

As each bead falls, it pulls the next one behind it. The falling motion creates a chain reaction.

The whole strand keeps flowing until it’s gone

The system only stops when the beads run out or friction slows them down.

It’s a perfect real-world example of force, motion, and gravity working together.

Watch it in Action:

More About Newton’s Laws of Motion & Gravity

Newton’s First Law states that an object at rest will remain at rest and an object in motion will remain in motion (unless acted upon by force). Another important term is Inertia.  Inertia is the tendency of a body to resist a change in motion or rest.

Newton’s Second Law states that force is equal to the mass of the object times its acceleration or F= MA.  A force is a push or a pull, and mass is a measurement of the amount of matter the object has. Acceleration measures how fast the velocity (speed with direction) changes.  So basically it means that you need a force to move an object. The bigger the mass, the greater the force you will need.

Newton’s Third Law says that for every action there is an equal and opposite reaction. Simple? kinda.

Newton’s Law of Gravity says that every particle attracts every other particle in the universe with a force which is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers. Hu?

Simpler terms: Gravity is a force that tries to pull two objects toward each other. Anything which has mass also has a gravitational pull equal to its mass. The more mass an object has, the stronger its gravitational pull is. Gravity is what keeps you on the ground and what makes things to fall to the ground.

Troubleshooting Tips

• The beads must be laid into the cup smoothly—knots stop the flow.

• Very short strands won’t work well.

• A wider container often gives better results.

• If the beads don’t start, tug a little harder or raise the cup higher.

Try These Extensions

• Predict what will happen before pulling.

• Compare two different bead lengths.

• Explore how height changes the speed of the flow.

• Try different types of beads or weights.

• Challenge older students to explain the momentum and chain reaction.

Want another cool gravity experiment?

Try this Gravity Spinner!

Or try one of my many other STEM projects for kids!