Standard Science Primary 3 Diversity

Luke tried to scratch a plastic ruler with a metal nail. He found that the nail left a deep scratch on the ruler. What does this tell him about the materials?

A Plastic is a stronger material than metal.
B Both materials have the same hardness.
C The metal nail is harder than the plastic ruler.
D The plastic ruler is harder than the metal nail.
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Worked Solution

Step 1: Hardness is the ability to resist being scratched. Step 2: A harder material can scratch a softer material. Step 3: Since the nail scratched the ruler, the nail is harder.

Correct answer: The metal nail is harder than the plastic ruler.

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