Siti released a wooden block from the top of a ramp. She repeated the experiment by covering the ramp with different materials. Which material will likely result in the block taking the LONGEST time to reach the bottom?
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Worked Solution
Step 1: Identify that the time taken depends on the frictional force between the block and the ramp.
Step 2: A rougher surface creates more friction, which opposes motion more strongly.
Step 3: Sandpaper is the roughest material listed.
Step 4: More friction results in a slower speed and a longer time to reach the bottom.
Correct answer: Sandpaper
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