Unit 6: Objects and machines

Have you ever wonder how do computers work? Here you can find a very clear explanation:

 

Unit 6: Tools and machines

What is a simple machine? How many simple machines do we know? Let's see if you have ever used one:

Unit 6: Electricity and inventions

Static electricity experiments:

Electric circuits:

Types of electric circuits:

Test your knowledge:

What do we know about electric circuits?