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. This is because __________.

A the block had more potential energy on the sandpaper
B the gravitational force acting on the block increased
C there was more frictional force between the block and the sandpaper
D the sandpaper ramp was steeper
Show Worked Solution

Worked Solution

Step 1: Identify the change in surface (sandpaper is rougher than smooth wood). Step 2: Recall that rougher surfaces produce more friction. Step 3: Frictional force opposes motion, causing the block to slow down. Step 4: Conclusion: More friction on sandpaper.

Correct answer: there was more frictional force between the block and the sandpaper

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