Siti wants to test how the type of surface affects the distance a toy car travels. She uses a ramp and releases the car from the same height on different surfaces. Which variable must be kept constant?
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Worked Solution
Step 1: Identify the aim (Surface vs Distance).
Step 2: The surface is the independent variable (changed).
Step 3: All other variables, including the mass of the car and the ramp height, must be kept the same for a fair test.
Correct answer: The mass of the toy car
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