Across:First row: Substance used as synthetic wool.Second row: A plastic used for making containers and carry bags.Third row: Substance made up of a large number of smaller molecules. Fourth row: This fabric is also known as artificial silk. Down:First column: A type of fibre obtained naturally from the cocoon.Second column: A synthetic fibre classified as a polyester.Third column: A polymer used for making ropes.

I want  complete notes on the chapter friction 

In my book subtopics are:

Friction 

Types of friction 

Factors affecting friction 

Methods of reducing friction 

Methods of increasing friction 

Advantages and disadvantages of friction 

Some real life based situation where friction is applied.

How to make a monomer into polymer if it is an addition polymer example

This planet, _______ is yellowish in colour and has many rings and satellites.

A. Uranus

B. Jupiter

C. Neptune

D. Saturn

Pasteurized milk does not need to be boiled. Why?

Write the $pH$ value of the

1. Saliva (before meal)

2. Saliva (after meal)

3. Lemon juice

4. Colourless aerated drink

5. Carrot juice

6. Coffee

7. Tomato juice

8. Tap water