Standard Science Primary 6 Interactions

Siti released a wooden block from the top of a ramp. She noticed the block moved more slowly when the ramp was covered with sandpaper compared to when it was smooth. Why did this happen?

A The sandpaper increased the gravitational force acting on the block.
B The sandpaper provided more friction to oppose the motion of the block.
C The sandpaper increased the potential energy of the block.
D The sandpaper decreased the weight of the block.
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Worked Solution

Step 1: Identify the surfaces (Sandpaper vs. Smooth). Sandpaper is rougher. Step 2: Recall that rougher surfaces produce more friction. Step 3: Friction opposes motion, causing the block to move more slowly.

Correct answer: The sandpaper provided more friction to oppose the motion of the block.

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