HOTS Science Primary 6 Interactions

Ravi wants to test if the angle of a ramp affects the speed of a toy car. He performs three trials. In Trial 1, he uses a smooth plastic ramp at 20°. In Trial 2, he uses the same ramp at 40°. Which setup should he use for Trial 3 to ensure a fair test?

A The same plastic ramp at 60°
B A longer plastic ramp at 20°
C A rough wooden ramp at 40°
D The same plastic ramp at 40° with a heavier car
Show Worked Solution

Worked Solution

Step 1: Identify the independent variable (Angle of ramp). Step [2-9]: To ensure a fair test, all other variables (surface, car, etc.) must remain the same. Step [2-9]: Only the angle should change; 60° follows the pattern of changing the angle while keeping the ramp identical.

Correct answer: The same plastic ramp at 60°

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