Standard Science Primary 6 Interactions

Ravi wants to find out how the type of surface affects the frictional force acting on a block. He uses a spring balance to pull the block across different surfaces. Which variable must he change in this experiment?

A The speed at which he pulls
B The force applied to the block
C The type of surface used
D The mass of the wooden block
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Worked Solution

Step 1: Identify the aim: effect of surface type on friction. Step [2-9]: The variable to be tested (independent variable) must be the type of surface. Step [2-9]: All other variables must be kept constant to ensure a fair test.

Correct answer: The type of surface used

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