Question

List few instances to show friction is evil

Answer 1

Friction plays an important role in our daily life.
lt is acting all the time around you. It helps you in many ways :-

ADVANTAGES OF FRICTION :-

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★ Friction helps us in walking and running. when we walk, there is friction between our foot ( or the sole of our shoe ) and the ground.
This prevents you from slipping .
on the other hand, If you try to walk on a wet floor on a wet floor , you tend to slip because the water reduces the friction between your foot . 

similarly , if you step on a banana peel , you will slip because the banana peel is smooth and reduces friction.

★ Friction helps us in writting and making drawings. If there were no friction, we would not be able to hold a pen vertically. It is friction that opposes slipping and helps us to hold the pen. also there is friction between our pen and the paper which prevents the pen from slipping on the paper.

It is the force of friction between our chalk and blackboard which enables your teacher to write on the blackboard.

★ Tyres of vehicles are made with special kinds of grooves so that they can move properly on road. These grooves help to have considereable friction and good grip between the tyres and the road.

similarly, when a tyre gets old , it's surface becomes smooth . vehicles with worn out tyres stop after covering a much longer distance ( when brakes are applied ) and hence, there is a greater risk of accident.

★ Friction produces heat. A matchstick lights up due to the friction against the side of matchbox when we strike it, This can destroy houses when catches fire.

★ The shoes of athletes are provided with spikes so as to increase friction and prevent slipping.

★ The force of friction helps to hold the nails and screws on the walls and in the wood.

★ wood can be cut because there is friction between the axe and the wood.

★ Friction helps us to open the lid of the bottle or the top of a pen, if your hands are oily or if you apply powder to your hands then , you will not be able to open, your hands will slip.

DISADVANTAGES OF FRICTION :-

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★ Tyres of vehicles wear out due to constant use. because of continuous friction between tyres and roads the grooves of tyres disappear and tyres become smooth. this may cause serious accidents.

★ the friction between branches of tress which rub against each other, forest fire occur.

★ friction produces heat, the engines of cars and other machinery , therefore, becomes very hot after running for sometime.

★ due to friction of pencil , chalk while writting they gets smaller and smaller.
similarly, continuous use of eraser makes it smaller.

★ Friction reduces the speed of moving vehicles to a great extent.

★ you have might seen while white washing the houses, the painter uses sand paper , this sand paper is worn-out and becomes smooth due to its repeated use.

★ In factories, specially you have seen where machines are used all the time, parts of machines rub against each other becomes hot and wear out quickly.