HOTS Science Primary 3 Diversity

Alexa wants to find out which type of paper (A, B, or C) is the strongest. She hangs weights on strips of each paper until they tear. Which variables must she keep constant for a fair test?

A The thickness of the strips and the width of the strips.
B The length of the strips and the weight at which they tear.
C The color of the paper and the brand of the paper.
D The type of paper and the number of weights.
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Worked Solution

Step 1: Identify the independent variable (Type of paper). Step [2-9]: Identify the dependent variable (Weight held before tearing). Step [2-9]: To be a fair test, the physical dimensions (thickness, width) must be constant so only the material type affects the result.

Correct answer: The thickness of the strips and the width of the strips.

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