Why is friction a necessary evil?

It is both good thing and bad thing for us

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Why friction is necessary? (Advantages of Friction)

Or we can also say, what are the different uses of Friction

Friction is used to-

 

Help us walk without slipping

Friction helps in walking on the ground because friction between our soles and ground prevent us from slipping

Friction helps in walking.jpg

Walking on slippery ground is difficult because friction is less there. So, we may slip

 

Make Moving objects Stop

If there is no friction

An object which starts moving, it will never stop

 

Picking and Holding Things

We would not be able to pick or hold a thing as it would slip from our hands

 

Helps in Writing

We are able to write because graphite particles from our pencil rub off on paper due to friction

Similarly teacher is able to write on board because chalk powder rubs off on board due to friction

If there is no friction, we would not be able to write

 

Lighting a matchstick

When we rub matchstick with side of matchbox,it produces heat due to friction.Without friction,we would not be able to light fire

 

Fixing a Nail in Wall

When we hammer a nail in wall, friction is produced between surface of nail and wall.

This friction helps in holding surface of nail properly

Advantages of Friction.jpg

 

Why friction is evil? (Disadvantages of friction)

 

It wears out different products

Example

When we wear shoes,soles wear out after some time because of friction

Steps of bridges wear out because of friction

Ball bearing of machines wear out due to friction

Tyres of car wear out after some time due to friction

 

It increases heat which may damage machines

When we use machines for a long period,it gets heated up

This is because of friction produced

Thus friction helps in heating of machine which may damage them

 

Friction Slows down speed of Object

Since friction opposes motion,it slows down speed of motion

Without friction,vehicles would move faster

 


Friction Reduces Efficiency and Increases Costs

Because of friction,more fuel is required to run vehicles like car

Hence it increase costs of operating vehicles and reduce their efficiency

Disadvantages of Friction.jpg

 

 

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

About the Author

CA Maninder Singh's photo - Expert in Practical Accounts, Taxation and Efiling
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.