Ravi wants to test how the surface of a ramp affects the distance a toy car travels. He uses four different materials for the ramp. Which variable must he keep the same to ensure a fair test?
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Worked Solution
Step 1: Identify the aim (Surface vs Distance).
Step [2-9]: The independent variable is the surface material.
Step [2-9]: To ensure the car starts with the same potential energy, the height of the ramp must be kept constant.
Correct answer: The height of the ramp
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