Question

Define friction. Write its advantages and disadvantages​

Answer 1

Answer:

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Friction is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other.

Advantages of friction:

1. Friction enables us to walk freely.

2. It helps to support ladder against wall.

3. It becomes possible to transfer one form of energy to another.

4. Objects can be piled up without slipping.

5. Breaks of vehicles work due to friction.

Disadvantages

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.

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

Answer 2

Answer:

Friction is the force that resists motion when the surface of one object comes in contact with the other.

Advantages: It helps us walk

Brakes in the car make use of friction to stop the car

Asteroids are burnt up before hitting earth due to friction caused due to the air in atmosphere

Disadvantages:Friction produces unnecessary heat leading to wastage of energy

Forest fires are caused due to friction from tree branches

Explanation:

Hope this helps (;