Advanced Science Primary 6 Interactions

Siti conducted an experiment using a spring balance to pull a block over two surfaces, A and B. She needed 5N of force for A and 8N of force for B. Which conclusion is correct?

A The mass of the block changed between tests.
B Surface B exerts more frictional force than Surface A.
C Surface A is rougher than Surface B.
D There is no friction acting on Surface A.
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Worked Solution

Step 1: Identify that force needed to move an object equals the frictional force acting against it. Step 2: Compare the values (8N > 5N). Step 3: Higher force requirement indicates higher friction on surface B.

Correct answer: Surface B exerts more frictional force than Surface A.

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