Standard Science Primary 4 Energy

Thumbtacks were attached to rods of different materials using wax. The rods were heated at one end. Which thumbtack will fall off FIRST?

A The one on the copper rod
B The one on the wooden rod
C The one on the glass rod
D The one on the plastic rod
Show Worked Solution

Worked Solution

Step 1: Copper is a metal and a good conductor of heat. Step 2: Heat travels through the copper rod to the wax the fastest. Step 3: The wax will melt first on the copper rod, causing the thumbtack to fall.

Correct answer: The one on the copper rod

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