A handful of craft sticks. A rubber band. One marshmallow. From these simple materials, an entire scientific investigation can unfold.
The Marshmallow Catapult STEM Challenge invites learners to explore how stored energy and design choices affect motion. But this task isn’t just about who can fling their marshmallow the farthest. It’s about asking:
“What made that launch go further?”
“What did I change — and what stayed the same?”
“How could I make this more accurate next time?”
It’s through that kind of thinking that theory becomes understanding.
Why This Challenge Matters
This challenge offers a playful but powerful way to explore:
- Force and motion — through hands-on application.
- Design and testing — through building and improving.
- Measurement and accuracy — through repeated trials.
Learners plan, test, reflect, and refine. They move from guessing to reasoning, and from observing results to analysing them.
Building Scientific Habits
The structured version of this challenge guides learners to:
- Build a consistent launcher using the same materials.
- Predict outcomes and test them under controlled conditions.
- Record distance, flight path, and anomalies (e.g. misfires).
- Reflect on how energy, angle, and design affect the outcome.
By focusing on one variable at a time, learners develop precision and reasoning — key traits in scientific enquiry.
Engaging Without Overcomplicating
Only simple supplies are needed:
- Lolly sticks or craft sticks
- Rubber bands
- Plastic spoon or bottle cap
- Tape measure
- Mini marshmallows
Educators can scaffold the challenge to include:
- Design comparisons
- Calculating averages
- Peer-to-peer testing
- Variables such as surface, pullback tension, or launch angle
And of course, it works equally well indoors or out.
Curriculum Connections
The catapult challenge supports multiple learning areas:
- Forces and motion
- Energy transfer and storage
- Design, testing, and iteration
- Fair testing and control variables
- Data collection and improvement planning
It also offers a safe, creative way to explore failure and revision — important for developing confident, independent thinkers.
Bundle Includes:
- Presentation to introduce the concept and prompt discussion
- Method-writing sheet and results tracker
- Evaluation prompts that build reflective enquiry
- Leaderboard and printable certificate
👉 Purchase the Marshamallow Catapult STEM Challenge Kit here
👉 View the full STEM Challenge Collection →
A simple launcher. A single marshmallow. And a leap from playing to thinking like a designer, tester, and scientist. That’s what makes this challenge more than just fun — it makes it meaningful.
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