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

 

Example

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

Running on mud and falling

 

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

I t is easier to push a lighter box than a heavier box

Man pushing light and heavy box.png

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

About the Author

Davneet Singh's photo - Teacher, Computer Engineer, Marketer
Davneet Singh
Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 9 years. He provides courses for Maths and Science at Teachoo.