1. Parts of the Atom
Physics 3

3. Bohr Model of the Atom

4. Where are the neutron, proton and electron located?
Protons and Neutrons= Nucleus
Electrons= Electron Orbital/Cloud

5. Differences in Size
The electron is much lighter in comparison to the proton thus they are free to transfer between objects
Also they are located on the outer boundary of the atom

6. Law of Attractive Forces
Likes Repel (- and -) (+ and +)
Opposites Attract (- and +)

7. Electrification By Contact (EBC)
Contact is required
Electrons are transferred between objects
PROTONS DO NOT MOVE!!!

8. Induction Contact is not made Electrons do not transfer
Electrons move away while protons are left behind

9. Balloon With Hair Balloon is Rubbed on the head
Balloon become negative while hair is positive
Opposites attract
Induction or EBC?

10. Balloon with Paper Balloon is charged by EBC Balloon has a – charge
Neutral paper is attracted to Balloon
Induction or EBC?

11. Lightning - charge builds at bottom of cloud
Induces a positive charge on the ground
Attraction!!!
If your hair stands up on a stormy day….RUN FOR YOUR LIFE!!! LIGHTNING IS ABOUT TO STRIKE!
Thunder is caused by the expansion and contraction of air…

12. Aluminum Can - Balloon (charged by EBC) is brought near a pop can
Can is attracted to balloon
Induction or EBC?

13. Van De Graff with Hair
Van De Graff builds a negative charge by the rubber belt
When you touch it you become negative
All your hair is negative and it repells each other
Note: You cannot be grounded. Why???

14. Balloon on Wall Balloon is charged by EBC Balloon is negative
Sticks to neutral wall because electrons move away and protons are left behind
Induction or EBC?

15. Balloon with H20 Balloon is charged by EBC
Stream of water is attracted to the balloon
Induction or EBC?

16. What is a Conductor? Material that allows electrons to flow freely
Examples include common metals like Copper, Iron, Nickel, etc.
EBC- whole object is charged
Induction- side closest to object is charged

17. What is an Insulator
An object that does not allow electricity to flow freely through it
Examples include rubber, plastic, wood, etc.
EBC- only the part that touched is charged
Induction- only part closest to charged object is charged

18. Triboelectric Series
Shows if an object likes to gain or lose electrons

19. Grounding
Providing a path to the ground so charges can balance out safely