science
Grade-3
Easy

Question

The friction developed is the maximum when a ____ surface rubs against a ____ surface.

  1. Rough, rough
  2. Rough, smooth
  3. Smooth, smooth
  4. 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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