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Why are bridges made of steel girders put on rollers? - Physics

Short Note

Why are bridges made of steel girders put on rollers?

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Solution

The beams of the bridges expand maximum during the summer days and contract maximum during the winter nights. If the beams are fixed at both ends on the pillars, they may develop crack due to expansion and contraction. To avoid this, beams are made to rest on rollers on the pillars to provide space for expansion.

Concept: Temperature
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APPEARS IN

Frank Class 9 Physics ICSE
Chapter 5 Heat
Exercise | Q 40 | Page 230
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