Grade Seven Science Question?

Question

Grade seven science, chemical and physical changes.

Solids are described as having a fixed volume. Most solids expand (increase volume) slightly when heated.

Many bridges have expansion joints in them.

What would happen to a bridge on a hot day if it did not have expansion joints?

Answer 1

The bridge would crack at the joints and then when it got really weak collapse. Sort of like they are making earthquake proof buildings now. The buildings allow for movement. Also volumes restrict when they are cold.

Answer 2

it would collapse

Answer 3

i guess the bridge would fall because when heated the joints expands and when cooled the joints would contract .sometimes the bridge may have  cracks when heated or cooled which would resolve to it collapsing because it keeps on expanding and contracting (think of it as ur skin when you expose it to anything cold it would be scaly and unsmooth and when you put it in a warm object your skin starts to crack that is beacause the particles has  no time to cool down or heat up)

Answer 4

Buckle.

Answer 5

the bridge materials would expand with no pressure relief and would get stress cracks from the pressure and eventually collapse under its own weight from the stress (think of it as what would happen if you had no way to stretch your muscles... they would lock up and cease to work... similar thing)