Release marbles with a tip-over device
Build a safe tip over device that releases marbles when tilted using cardboard, a ramp, and simple levers; test angles and observe motion.
About this activity
Build a safe tip over device that releases marbles when tilted using cardboard, a ramp, and simple levers; test angles and observe motion.
What you need
Step by step
- 1
Step 1
Clear a flat tabletop to make a safe workspace.
- 2
Step 2
Cut a cardboard rectangle about 30 cm by 15 cm to make the base.
- 3
Step 3
Cut a long cardboard strip about 30 cm by 8 cm to make the ramp.
- 4
Step 4
Cut a small cardboard piece about 6 cm by 4 cm to make the tipping platform.
- 5
Step 5
Tape a popsicle stick across the bottom center of the small platform so it becomes a lever arm.
- 6
Step 6
Slide a pencil under the popsicle stick so the platform can rock on the pencil like a seesaw.
- 7
Step 7
Prop one end of the ramp on the small box to create a sloped ramp.
- 8
Step 8
Tape the ramp to the base so the slope stays steady and does not slide.
- 9
Step 9
Tape the tipping platform at the top of the ramp so rolling marbles land on it.
- 10
Step 10
Tape thin cardboard strips along both ramp edges to make guides that keep marbles on the ramp.
- 11
Step 11
Place 1 to 3 marbles on the tipping platform to prepare for testing.
- 12
Step 12
Add a small cardboard stopper at the downhill edge of the platform to hold the marbles in place.
- 13
Step 13
Slowly raise the ramp support to increase the incline until the platform tips and the marbles roll off.
- 14
Step 14
Measure the ramp angle at the moment the platform tips with your protractor and write the angle down.
- 15
Step 15
Share your finished tip-over marble device and what you observed on DIY.org
Fun facts
How do you build a safe tip-over marble-release device?
To build a tip-over marble-release device, fold a cardboard base for stability and attach a small cardboard lever or cup on a pivot (a strip of cardboard or thick straw) so it tips when pressed. Place a sloped cardboard ramp under the release point. Secure joints with tape or glue, then adjust the pivot and ramp angle. Test several tilt angles and observe how speed and distance change as the marble rolls.
What materials do I need to build a marble tip-over and ramp?
You’ll need cardboard sheets or a cereal box, marbles, a ruler and protractor for measuring angles, pencil, scissors or a box cutter (adult use), tape or hot glue (adult use), and a small cup or folded cardboard for the release cup. Use blocks or books to set ramp height, and optional markers to record angles. Keep a tray or cloth to catch marbles and spare cardboard for adjustments.
What ages is a cardboard tip-over marble activity suitable for?
This activity suits children about 5–12 years old. Ages 5–7 can build and test with close adult help for cutting and secure glueing; ages 8–12 can plan, measure angles, and experiment more independently with supervision. Preschoolers (3–4) can watch, sort marbles, and help place ramps but should not handle small parts unsupervised. Always supervise small parts and sharp tools.
What are the benefits and safety tips for marble tip-over experiments?
Benefits include learning gravity, slopes, simple machines, measuring angles, problem solving and fine motor skills. Safety tips: supervise cutting and hot glue use, tape or sand sharp cardboard edges, use child-safe scissors, keep marbles away from children under three, test on a stable non-slip surface, and avoid aiming marbles at people or animals. Try variations by changing ramp height, release angle, or marble size to compare results.
Watch & Learn
Need help?
What can we use instead of a popsicle stick, pencil, marbles, or protractor if we don't have them?
Use a small wooden craft stick or folded cardstock for the popsicle stick lever arm, a pen or dowel as the pencil pivot, smooth beads or crumpled aluminum-foil balls instead of glass marbles, and a smartphone protractor app or printed angle chart to measure the ramp angle.
Why won't the tipping platform tip when I raise the ramp, and how can I fix it?
Make sure the popsicle stick is taped across the bottom center of the small platform, reduce friction at the pencil pivot with a smoother dowel or spacers, tighten the ramp tape to the base so the slope doesn't shift, shorten or reposition the small cardboard stopper if it blocks release, and try fewer marbles or move them forward on the platform.
How can I adapt this tip-over marble device for different age groups?
For younger children, pre-cut the 30×15 cm base and other cardboard pieces, use larger balls and have an adult place the pencil under the popsicle stick, while older kids can cut the 30×8 cm ramp themselves, add cardboard guides, measure angles with a protractor, and vary marble counts for experiments.
How can we extend or personalize the activity to make it more challenging or creative?
Decorate or label the base and ramp, add adjustable supports under the ramp to test different inclines, tape a small cardboard chute after the tipping platform to redirect marbles, and record tipping angles for 1–3 marbles to share your results and photos on DIY.org.