science
Grade-3
Easy
Question
The friction developed is the minimum when a ____ surface rubs against a ____ surface.
- Rough, rough
- Rough, smooth
- Smooth, smooth
- Both 1 and 3
The correct answer is: Smooth, smooth
Friction is the least when a smooth surface rubs against another smooth surface. Two polished or lubricated surfaces freely slide on each other, as there is the least friction between them.
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