Ross wants to test the strength of four different types of string (W, X, Y, Z). He hangs weights on them until they break. What must he keep the SAME to make it a fair test?
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Worked Solution
Step 1: To compare the strength of different materials fairly, other physical factors must be constant.
Step 2: Thickness affects how much weight a string can hold regardless of its material.
Step 3: Therefore, thickness must be kept the same.
Correct answer: The thickness of the string
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