Get smart curated videos delivered to your inbox.   SUBSCRIBE
The Kid Should See This

Fun with Arches, a series of engineering demonstrations

Watch more with these video collections:

How do arches work? Explore compression, tension, equilibrium, and more in this Fun with Arches video by G. Wayne Brodland, professor of engineering at the University of Waterloo in Ontario, Canada. In this series of demonstrations, he explains how an arch gets its strength, revealing the vertical and horizontal forces that are transferred down into the arch’s base.

He also demonstrates how a chain suspended from both ends can reflect a successful arch. Dandi Zhao and Zi Yang assist. Via Wikipedia:

Architecturally, a catenary arch has the ability to withstand the weight of the material from which it is constructed, without collapsing. For an arch of uniform density and thickness, supporting only its own weight, the catenary is the ideal curve.

Catenary arches are strong because they redirect the vertical force of gravity into compression forces pressing along the arch’s curve. In a uniformly loaded catenary arch, the line of thrust runs through its center.

arch chain test
Brodland has a series of video lessons, activities, and downloadables on his Mechanical Models site that can be used for class or at home, including the arches activity above. Though his videos proceed methodically, he encourages learners to take their time, and to have fun exploring and testing how “the forces in an arch interact for equilibrium to exist.”

assembling an arch with blocks
Related activity: How to Build a Roman Arch with Sugarcubes.

Next, watch Red PaperBridge and how to make Leonardo da Vinci’s self-supporting bridge, two favorites.

Also, don’t miss Crash Course Kids’ Succeed by Failing: Failure points and how to fix them.

This Webby award-winning video collection exists to help teachers, librarians, and families spark kid wonder and curiosity. TKSST features smarter, more meaningful content than what's usually served up by YouTube's algorithms, and amplifies the creators who make that content.

Curated, kid-friendly, independently-published. Support this mission by becoming a sustaining member today.

🌈 Watch these videos next...

Why was the Golden Gate Bridge considered impossible?

Rion Nakaya

Why do honeybees love hexagons?

Rion Nakaya

Which ball will race to the bottom first?

Rion Nakaya

What happens to balloon animals in liquid nitrogen?

Rion Nakaya

What happens to a flame in an electric field?

Rion Nakaya

Weight distribution on light bulbs and eggs, a physics demonstration

Rion Nakaya

Topology, a 1961 Eames film for IBM’s Mathematica Exhibit

Rion Nakaya

Three striped balls & a polka dot ball (1976) – Sesame Street

Rion Nakaya

The most amazing thing about domino chain reactions

Rion Nakaya