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OCR: RESONANCE LL OBJECTS vibrate with a particular Afrequency, or regularity. The swinging of a pendulum is an obvious movement, but the particles that make up any object vibrate too. Resonance results when the vibrations of an object are matched with similar vibrations. That A is why soldiers never march in time over 7 a bridge. The vibrations of their marching could match and increase the bridge's vibrations, causing it to break up and collapse. Breaking glass A RESONATING A wineglass can BRIDGE COLLAPSES be shattered by a In 1940 a strong wind sound wave if the caused a bridge to resonate wave matches the and collapse over the natural vibrations Tacoma Narrows, of the glass. Washington State. SEE PENDULUMS ALSO