Friction depends on

  • Nature of Surface - smooth or rough
  • Weight of object on the surface


Nature of Surface


If surface is smooth, interlocking of both surfaces will be less. Thus, friction will be less

If surface is rough, interlocking of both surfaces will be more. Thus, friction will be more



Concrete road is rough .If we run on it, we do not slip as there is more friction

Muddy road is smoother. if we run on it , we can slip as there is less friction


Running on ground.gif

Running on mud - falling.gif


Example 2

In new shoes,soles are rough.So we can walk fast without falling

In old shoes,soles become smooth.So if we walk fast,we can slip

Running with old shoes.jpg


Weight of object on the surface

It is easier to push a heavier box than a lighter box

Man pushing light and heavy box.png

  1. Class 8
  2. Chapter 12 Class 8 - Friction

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CA Maninder Singh
CA Maninder Singh is a Chartered Accountant for the past 9 years and a teacher from the past 16 years. He teaches Spoken English, Written English, Grammar and Vocabulary at Englishtan.