Question on: JAMB Physics - 2017
Why do soldiers march disorderly while crossing a bridge?
A
To prevent resonance on the bridge
B
To set the bridge into resonance
C
To make the b ridge collapse
D
To spread their weight evenly on the bridge
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Correct Option: A
Soldiers march disorderly while crossing a bridge to prevent resonance because when soldiers march in orderly manner across a bridge, they generate a rhythmic oscillation of wave out. The bridge and at a certain point, would start oscillation to the same rhym as that of the marching steps. This oscillation would reach a maximum peak when the bridge can no longer sustain its own strength and hence collapses. So for this reasons, soldier are ordered to march disorderly while crossing a bridge
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