Storing Energy Experiment . T 5

https://youtu.be/Fo5F9SXoFH4 

storing energy 2https://youtu.be/cJQhVMmWiGE

friction with toy carshttps://youtu.be/zojtEhKZe1Q

LESSON 6:

simple machines https://youtu.be/zDR8tcGPA3s

Pulley system: https://youtu.be/d5FnoMUNODc