Question

Friction is a neccessary evil. Why?

Answer 1

Friction is a necessary evil because it has both advantages and disadvantages.

Here are some of them...

Friction is necessity

(1) It is due to friction between the ground and the feet that we are able to walk.

(2) The brakes of a vehicle cannot work without friction.

(3) Various parts of a machine are able to rotate because of friction between belt and pulley.

(4) The tyres of vehicles are made rough to increase friction.

(5) Nails and screws join various wooden parts due to friction.

(6) In the absence of friction it will not be possible to write on paper with a pen or pencil.

Friction is an evil:

(1) Wear and tear of machinery is due to friction.

(2) A large amount of power is wasted in overcoming friction and the efficiency of the machines decrease considerably.

(3) Excessive friction between rotating parts of a machine producers enough heat and causes damage to the machinery.

Hope this helps you

Brainly Stars.

Answer 2

Explanation:

Friction although is necessary, can be excessive at times. Most machines require repair and maintenance because of the frictional force. The friction between parts over time is responsible for a majority of the wear and tear in a machine. So if you’re cycling needs to get repaired, you know who to blame. The frictional force also causes most of the injuries. When you fall down, the part of your body in contact with the ground scrapes the surface as you fall. The frictional force is responsible for the wound and blood. Without friction, it would be like slipping on ice. You’d just slip and slide away. It is also responsible for our cars and vehicles slowing down. When you are moving, you experience frictional forces due to multiple sources. The friction between you and the ground, the frictional force between you and the air you are moving through. Without frictional force, you’d just have to pedal your cycle once or twice and you’d keep going on and on. Thus when we are moving, we waste a lot of energy overcoming the frictional force opposing our motion.