1. Warm Up #10 Which particles in an atom have electric charges?
Where are electrons in an atom?

2. Lesson 1: Electric Charge and electric forces
Ch. 9 Electricity
Lesson 1: Electric Charge and electric forces

3. Essential Questions How do electrically charged objects interact?
How can objects become electrically charged?
What is an electric discharge?

4. How can you bend water? ACTIVITY
Inflate a balloon and tie the end. Place an X on one side of the balloon.
Hold a funnel over a large bowl and pour a cup of water through the funnel. As the water flows gently, bring the balloon as close to the stream without getting it wet.
What do you notice?
Rub the X side of the balloon on a sweater. Repeat step above with the X side facing the stream of water.
Why did this happen?
What do you think would happen if I just touched my sweater instead of rubbing it?

5. Electric Charges All matter is made of particles called atoms
All atoms are made of smaller particles – protons, neutrons, and electrons
Protons = positive, inside nucleus
Neutrons = neutral, inside nucleus
Electrons = Negative, around nucleus
Worksheet on parts of atom

6. Electric Charges
How can objects become electrically charged?

7. Electric Charges
Electrically neutral atoms – have same amount of protons and electrons
Electrically positive atoms – have more protons than electrons
Electrically negative atoms – have more electrons than protons
Electrically charged atoms are called ions
Static charge – an unbalanced negative or positive electric charge on an object
Electrical Charge Worksheet

8. Electric Forces Electric field – area surrounding a charged object
Electric force – the electric field applies a force to other charged objects
The strength of the electric force between 2 charged objects depends on the total amount of the charge on both objects and the distance between the objects
Attract/Repel
Worksheet

9. Warm Up #11
What is 1 material through which electrons can move easily?
How does an electric insulator differ from an electric conductor?

10. How can a balloon push or pull? activity
Inflate 2 balloons and attach a 10 cam length of string to each balloon.
Hold balloons by the string and slowly bring together.
What did you observe?
Hold 1 balloon over some packing peanuts.
Rub each balloon against a piece of wool cloth. Repeat Step 2.
Rub 1 balloon with wool. Repeat Step 3.

11. Transferring electrons
Electric insulator – a material in which electrons can’t easily move
Ex. Glass, rubber, wood, air
Electric conductor – a material in which electrons can easily move
Ex. Metals (copper, aluminum)

12. Transferring electrons
When objects made of different materials touch, electrons tend to collect on the object that holds electrons more tightly – transferring charge by contact
Transferring charge by induction – a process by which one
object causes 2 other objects that are conductors to become
charged without touching
Polarized – when electrons concentrate at 1 end of an object
Static Electricity Worksheet
BrainPOP – Static Electricy

13. Transferring electrons
Transferring charge by conduction – conducting objects with unequal charges touch, electrons flow from the object with a greater concentration of negative charge to the one with a lower concentration, which continues until the concentration on charge of both is equal
I.E. water flowing from a container with a higher water level to one with a lower level until both are equal

14. Warm up #12
Why is grounding important?

15. Electric Discharge
Electric discharge – the process of an unbalanced electric charge becoming balanced
Can occur slowly when hair loses negative charge when being brushed
Can occur quickly when a flash of lightning occurs
Grounding – providing a path for electric charges to flow safely into the ground
Very important when dealing with lightning