Standard Science Primary 6 Interactions

Ravi wants to test how the type of lubricant affects the distance a block travels. He uses water, oil, and soapy water. Which variable must he change?

A The material of the block
B The height of the ramp
C The type of lubricant
D The mass of the block
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Worked Solution

Step 1: The aim is to test the effect of the type of lubricant. Step [2-9]: The variable being tested (independent variable) must be the only one changed. Step [2-9]: Therefore, he must change the type of lubricant.

Correct answer: The type of lubricant

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