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Pennsbury High School • February 17, 2026

Engineering Challenge:The Marshmallow Tower

9th and 10th graders pushed the limits of physics and geometry to build the tallest free-standing structure using only toothpicks and marshmallows.

9th & 10th
Grade Level
Stability
Focus Concept
Teamwork
Key Skill

Engineering Physics

It's not just about stacking—it's about understanding the forces at play.

Structural Stability

Teams learned that a wide base and low center of mass are crucial for preventing towers from toppling over.

Triangulation

Using triangles (trusses) proved to be the strongest shape, preventing the marshmallows from sliding or collapsing.

Load Distribution

Understanding how to spread the weight of the tower evenly to avoid crushing the bottom marshmallows.

Iterative Design

Test, fail, improve! Students had to quickly adapt their designs when towers started leaning.

Construction Zone

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