Siti wants to find out how the surface of a ramp affects the time taken for a toy car to reach the bottom. She uses the same car and height for each test. Which of the following should she change?
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Worked Solution
Step 1: Identify the independent variable (the factor being tested).
Step [2-9]: The aim is to test the effect of the surface.
Step [2-9]: Therefore, the material covering the ramp is the only variable that should be changed.
Correct answer: The material covering the ramp
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