Standard Science Primary 6 Interactions

Siti released a wooden block from the top of a ramp. She noticed that the block moved slower when the ramp was covered with sandpaper compared to when it was smooth wood. Which of the following explains her observation?

A The gravitational force acting on the block increased.
B The frictional force between the block and the sandpaper is greater.
C The magnetic force between the ramp and the block decreased.
D The sandpaper reduced the mass of the block.
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Worked Solution

Step 1: Identify the change in variable (sandpaper vs smooth wood). Step 2: Sandpaper has a rougher surface than smooth wood. Step 3: Rougher surfaces produce more frictional force, which opposes motion and slows down the block.

Correct answer: The frictional force between the block and the sandpaper is greater.

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