Uploaded May 2019 | Updated September 2026, 2 weeks ago

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When two 1-pound, 2-inch diameter, chrome steel spheres are smashed together, enough heat is generated at the point of contact to burn a hole in a piece of ordinary paper! This amazing demonstration graphically illustrates the conversion of mechanical energy into heat energy. Although there are no flames, a charred hole appears along with the odor of burnt paper.
Available at teachersource.com/product/smashing-steel-sphere-demo-kit/energy-conversion