science
Grade-3
Easy
Question
A ____ surface offers the least friction when rubbed against any other surface.
- Smooth
- Rough
- Scratched
- Wiped
The correct answer is: Smooth
Friction is the least when two smooth surfaces rub against each other. Two polished or lubricated surfaces freely slide on each other, as there is the least friction between them.
Hence, smooth is the right answer.
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