Standard Science Primary 4 Energy

Ravi stuck four identical metal pins onto a copper rod using wax. He heated one end of the rod. Which pin will fall off FIRST?

A The pin furthest from the heat source.
B The pin in the middle of the rod.
C All pins will fall off at the same time.
D The pin closest to the heat source.
Show Worked Solution

Worked Solution

Step 1: Heat travels from a hotter region to a colder region through conduction. Step 2: The wax closest to the flame will reach its melting point first. Step 3: Therefore, the pin closest to the heat source falls first.

Correct answer: The pin closest to the heat source.

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