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When a Troop Crosses a Suspension Bridge the Soldiers Are Asked to Break Steps. Explain the Reason. - Physics

Short Note

When a troop crosses a suspension bridge the soldiers are asked to break steps. Explain the reason.

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Solution

When a troop crosses a suspension bridge, the soldiers are asked to break steps. The reason is that when soldiers march in steps, all the separate periodic forces exerted by them are in same phase and therefore forced vibrations of a particular frequency are produced in the bridge. Now, if the natural frequency of the bridge happens to be equal to the frequency of the steps, the bridge will vibrate with large amplitude due to resonance and suspension bridge could crumble.

Concept: Sound - Forced Vibrations and Resonance
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APPEARS IN

Selina Concise Physics Class 10 ICSE
Chapter 7 Sound
Exercise 7 (B) | Q 30 | Page 165
Frank ICSE Class 10 Physics Part 2
Chapter 3 Sound
Exercise 3.2 | Q 13 | Page 145
ICSE Class 10 Physics
Chapter 6 Echoes and Vibrations of Sound
Short Answers | Q 51
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