Learning Path
Question & Answer1
Understand Question2
Review Options3
Learn Explanation4
Explore TopicChoose the Best Answer
A
Rougher surfaces generally increase friction due to greater interlocking of surface features.
B
Smoother surfaces always result in higher friction regardless of the materials.
C
Surface roughness has no impact on friction; only the materials' chemical properties matter.
D
Friction is solely determined by the weight of the materials in contact with each other.
Understanding the Answer
Let's break down why this is correct
Answer
Surface roughness changes how the two materials touch each other by creating tiny bumps and valleys that can lock together. When the surfaces are rough, the bumps press into each other, increasing the real area of contact and making it harder to slide, so friction goes up. If the surfaces are very smooth, fewer bumps meet, the contact area shrinks, and friction drops. In some cases, an extremely rough surface can trap air or debris, which may actually reduce friction. For instance, a tire’s tread grips a rough asphalt road better because the tread cuts into the bumps, giving the car more traction.
Detailed Explanation
A rougher surface has many bumps and valleys. Other options are incorrect because The idea that smoother surfaces always give more friction is a mistake; Thinking that only chemical properties matter ignores texture.
Key Concepts
Surface Roughness
Topic
Friction Behavior Demonstration
Difficulty
easy level question
Cognitive Level
understand
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