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Marshmallow Catapult Challenge | Fun STEM Science Activity for Kids

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The Great Marshmallow Launch: A Catapult Engineering Challenge


Turn your living room into an engineering testing ground! Challenge your child to construct a working catapult from simple, everyday materials and discover just how far a marshmallow can fly. This hands-on, action-packed project is a brilliant introduction to the fascinating world of physics and mechanical design.

Rather than just following instructions, young learners will experience the true engineering cycle as they design, build, test, and improve their catapults to achieve maximum distance.


What’s Included in this Download:

  • Step-by-Step Build Instructions: Clear, easy-to-follow visual guides for constructing a sturdy, working catapult.
  • Child-Friendly Physics Guide: A breakdown of the "why" behind the launch, explaining complex concepts like potential energy and projectile motion in language kids actually understand.
  • Measuring Record Sheet: A printable data tracker for young engineers to record their launch distances, test new variables, and document their improvements.
  • Comprehensive Parent Guide: Everything you need to facilitate the challenge, ask the right questions, and guide the learning process.


Core Learning Outcomes: Through trial, error, and epic marshmallow launches, your child will gain practical, hands-on experience with forces, energy transfer, and projectile motion. They will learn the value of the engineering iteration process—discovering that the first design is never the final design.


Crafted by an award-winning science educator and trusted by families and over 100 schools..


Save more by purchasing the Ultimate Classroom Science Activities Mega Bundle



🔗 Related Resources:

Find the FULL STEM Challenge Kit here.



Related Blogs:

Read the Marshmallow Catapult blog Here

Meet The Science Investigation Challenge Series


You will get a PDF (2MB) file