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# 26.6, 7, 8 Concept Q

### cdeutsch/ursuline

QuestionAnswer
Why do different objects make different sounds when dropped on the floor? Because it depends on the elasticity and shape of the object.
What are 2 factors that can affect the 'natural' frequency of an object? Elasticity & shape
Give 2 examples of forced vibrations. tuning fork on a table a music box on a ledge
When does resonance occur? When the frequency of the forced vibration of an object matches the object's natural frequency.
What effect does resonance have on the amplitude of waves? Resonance increases the amplitude.
How did resonance affect the Tacoma Narrows Bridge? When the natural frequency of the marching soldiers matched the rhythm of the bridge, the bridge collapsed. Wind caused the increasing amplitude to eventually caused the bridge to collapse.
Why is it dangerous for people in the balcony to stamp their feet in a steady rhythm? Because the natural frequency will match with their stomping and cause the balcony to collapse.
Created by: cdeutsch
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