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Expansion and contraction
Lower Sec Science · Secondary 2 · Hard · Expansion and contraction
A metal bar is fixed between two walls. On a very hot day, the bar expands and bends upwards. Which statement best explains this?
Use the idea of expansion of solids when heated.
Use the idea of expansion of solids when heated.
- The bar expands when heated but its ends are fixed, so it bends upwards.
- The bar contracts when heated and pulls itself upwards.
- The bar melts and then solidifies in a bent shape.
- The walls expand more than the bar and push it upwards.
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