Question

what is streamlining and how it is useful 

List the advantages of Friction 

List the Disadvantages of Friction 

List 4 methods to minimize the friction in case of two solid surfaces in contact with each other 

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Answer 1

Answer:

Streamline is slimmer at the ends and thicker at the middle. It helps to decrease the drag created by fluids and thus allowing the body to move freely.

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 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.

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

Sorry but the last one I don't know.....