Advanced Science Primary 4 Energy

A bimetallic strip is made of two different metals, Brass and Iron, bonded together. When heated, Brass expands more than Iron. In which direction will the strip bend?

A It will bend towards the Brass side.
B It will stay straight.
C It will twist into a spiral.
D It will bend towards the Iron side.
Show Worked Solution

Worked Solution

Step 1: Both metals gain heat and expand. Step [2-9]: Brass expands more than Iron. Step [2-9]: To accommodate the extra length, the Brass becomes the outer layer, causing the strip to bend toward the Iron.

Correct answer: It will bend towards the Iron side.

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