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![[Post New]](/templates/default/images/icon_minipost_new.gif) 3 Oct 2007 14:41:07 IST
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All things have their natural frequency. As explained by sankydreams all things oscillate due to oscillations of atoms and the resulatnat oscillation is called natural frequency. That means all things around you are actually oscillating!!
When requency due to some external periodic force matches this, the object may break. This fact is taken in consideration while contrusting huge structures and the best example of it is bridge.
The bridge has a shape such that the centre part of it undergoes maximum 'bending' due to its owm weight and the restoring force pushes it upwards and thus bridges tend to oscillate with some 'natural' frequency. You might have experienced that when a heavy vehicle passes from the bridge, bridge oscillates with a slightly larger amplitude. Due to air (during storms) if the frequency due to force exerted by air on the bridge matches the natural frequency then the bridge may collapse. There are many examples of this fact in history. That is the reason that soldiers do not march on bridges.
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