Physics · Sound Waves

When an army group crosses a bridge, the soldiers are instructed not to march in step because:

Verified Solution4 OptionsUpdated: October 2026👁️1 View

1It decreases the frictional force between boots and the bridge surface
2Marching in step causes excessive horizontal swinging of the bridge
3There is a risk of the bridge breaking due to resonance caused by periodic footsteps✓
4The combined weight weakens the bridge structure

Correct answer

There is a risk of the bridge breaking due to resonance caused by periodic footsteps

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