​learning objectives:

• ​you should be able to describe the process of charging by friction by referring to the stimulation proposed by your teacher.

​previous knowledge

• ​charging(electrification).

• ​electrons and protons.

• ​neutral body.

• ​charged body.

Answer the questions below by referring to the previous slide's stimulation:

​1- what is the net charge on the balloon and blouse at the beginning?​

​2- drag the balloon near the blouse and rub both against each other.

​3- what is the net charge of the balloon and blouse?

​4- Could charges be created or destroyed? or just be transferred from one place to another? In which direction do electrons transfer ?​

​5- Deduce the net charge sign on the balloon and blouse?Explain.

6- Try to interpret the sign and source of the net charge on the balloon and blouse.

​7- what is 'charging by friction', using you own words?

Evaluation Question

Arrange the statements below to describe charging by friction of 2 bodies A and B in the correct order:

• ​result: 2 oppositely charged bodies.( )

• ​​​rubbing A by B.( )

• ​electrons transfer from A to B.( )

• ​

​exit ticket

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​In the next slide, there is a video about simple experiments you can try at home.

use the link below for revising at home​

(112) Electrification by Friction - Current Electricity (CBSE Grade 08 Physics) - YouTube​