How Sandpaper Smooths Wood
Written by Studio AM.
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Sandpaper feels rough because hard grains cover its surface. Each grain acts like a tiny cutting edge. When the paper moves across wood, the grains shave off high spots and leave small scratches. Coarse paper has larger grains, so it removes material quickly.
Fine paper has smaller grains. It removes the deeper marks left by coarse paper and makes the surface feel smoother. A worker often begins coarse and changes to finer paper in steps. Dust can hide scratches, so wiping the wood helps reveal the result. As grains wear down or fill with dust, the sheet cuts less well and must be cleaned or replaced. Sandpaper does not press bumps flat. It slowly cuts them away until the surface is even.
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Questions
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Question 1 of 4
What is the main idea of the passage?
The answer is A: Sandpaper smooths wood by using hard grains to cut away uneven material in stages.
The passage explains how abrasive grains cut wood and why workers move from coarse to fine paper for a smoother surface.
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Question 2 of 4
After using coarse paper, a worker still sees deep scratches. What should the worker try next?
The answer is B: Use fine paper to remove the deeper scratches left by coarse paper.
The text says fine paper removes the deeper marks from coarse paper, so changing grades improves the surface step by step.
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Question 3 of 4
What does “coarse” mean in this passage?
The answer is C: Rough, with larger grains
The passage contrasts coarse paper's larger grains with fine paper's smaller grains, showing that coarse means rougher.
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Question 4 of 4
What action helps a worker see scratches hidden by dust?
The answer is D: Wiping the wood
The passage directly says that wiping the wood helps reveal the result when dust hides scratches.
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