Question

Why are army troops not allowed to march in steps while crossing a bridge?

Answer 1

Because of resonance effect,if they keep martching then their frequency will match with bridge frequency and because of that bridge will collapse

Answer 2

Answer:

Hi,

Please find below the solution to the asked query:

Every object has some definite frequency with which it can oscillate. When the soldiers cross the bridge by marching, then  frequency of marching soilders may match with the intrinsic fequency of the bridge. In this case, the bridge will picks up the motion of the marching soldiers and it will starts oscillating and eventually breaks. this is called resonance. So generally soldiers are asked to break their steps when crossing a bridge.

Hope this information will clear your doubts about the topic.