Question

what is frictional force ?
write their advantages and disadvantages ​

Answer 1

Answer:

Friction is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other. There are several types of friction: Dry friction is a force that opposes the relative lateral motion of two solid surfaces in contact.

State two advantages and disadvantages of friction.

1.It always resists the motion, so extra energy is required to overcome it.

2.It causes wear and tear of machines.

3.It decreases the life expectancy of moving parts of vehicles.

Since friction is very useful in some cases while harmful in some cases, friction is called a necessary evil.

Explanation:

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Answer 2

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Advantages of friction:-

It is because of friction that we can walk, drive, open doors, turn tap and write.Screw and nails do not slip of because of the friction between the wood and the metal surface of the screw .

Disadvantages of friction:-

Friction causes the moving parts in machinery and automobiles to heat up this results in wastage of energy and fuel. Fiction also causes wear and Tear of the moving parts .