science
Grade-3
Easy
Question
The friction developed is the maximum when a ____ surface rubs against a ____ surface.
- Rough, rough
- Rough, smooth
- Smooth, smooth
- Both 1 and 3
The correct answer is: Rough, rough
Friction developed is the maximum either between two smooth or two rough surfaces. Friction is least between a smooth and rough surface. Hence, both 1 and 3 are correct.
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