Standard Science Primary 6 Interactions

Siti pushed a 500g wooden block across two different surfaces, X and Y. She measured the force needed to move the block using a spring balance. The reading for Surface X was 5 N and for Surface Y was 8 N. Which of the following is correct?

A Surface X is rougher than Surface Y.
B Surface Y has less friction than Surface X.
C Frictional force is the same on both surfaces.
D Surface Y is rougher than Surface X.
Show Worked Solution

Worked Solution

Step 1: Frictional force opposes motion and depends on the roughness of surfaces. Step [2-9]: A higher reading on the spring balance indicates that more force was needed to overcome friction. Step [2-9]: Since Surface Y required 8 N (higher than 5 N), Surface Y has more friction and is rougher.

Correct answer: Surface Y is rougher than Surface X.

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