Ravi wants to test the flexibility of four different strips of materials, A, B, C, and D. He hangs a 500g weight on the end of each strip and measures how much it bends. Which variable must be kept constant?
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Worked Solution
Step 1: The aim is to test flexibility of different materials.
Step [2-9]: To ensure a fair test, all physical dimensions of the strips (length, width, thickness) must be the same.
Step [2-9]: Therefore, thickness must be a constant variable.
Correct answer: The thickness of the strip
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