Warm up the bridge. Fun physical experience at home

ENTERTAINING EXPERIENCES AT HOME
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Warm up the bridge. Physical experiments

Entertaining experiments in physics

Entertaining experiences at home / Physics experiments for children

How are we going to heat it up? With a match? Candle? Don't worry, the bridge will get warm without us. Let the sun bake well! And in winter, when it's cold, the bridge will, of course, cool down. But the bridge is steel, like a needle or a spoke. What does it mean that it lengthens when heated? So the bridge is longer in summer than in winter?

Yes, longer. Very little, just a few centimeters. But this may be enough to destroy the foundations? on which the bridge rests! Therefore, large bridges made of steel or reinforced concrete are placed in a special way. Only one end of the bridge is fixedly fixed, while the other lies on steel rollers. In summer, these rollers slightly drive off towards the coast, in winter - towards the river. The bridge is breathing!

We heat the bridge

For the same reason, gaps are left at the junctions of railroad rails. It would seem that these gaps only interfere, create unnecessary shaking and noise. To make the trains run more calmly, the rails after laying are welded into long "lashes", several pieces in each. But it is impossible to weld all the rails along the entire length of the road into one whip. They will either be torn apart in winter, or kicked out, bent into an arc on a hot summer day!

Author: Galpershtein L.Ya.

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