HOTS Science Primary 6 Interactions

Alexa releases a block from the top of a ramp. She wants to test if the surface texture affects the time taken to reach the bottom. She uses four ramps with different textures but different heights. Why is her experiment NOT a fair test?

A She did not measure the distance travelled.
B She should have used the same surface for all ramps.
C She should have used blocks of different masses.
D She changed more than one variable.
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Worked Solution

Step 1: A fair test changes only the independent variable (surface texture). Step [2-9]: All other variables (ramp height, block mass, ramp length) must be constant. Step [2-9]: By changing both texture and height, she cannot know which one caused the difference in time.

Correct answer: She changed more than one variable.

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