Warm up 12.01.08

•Take an Anchor Question from the gray tray and glue it in your notebook.

•You will need a new sheet for the C-notes.

Goals for today:Goals for today:AnnouncementsAnnouncementsElectricity Intro: Electricity Intro:

ChargesChargesAnchor QuestionsAnchor Questions

ReflectionReflection

Topic: Electrical Charges

Electrical Charge is a property of matter.

Examples of properties of matter:Water- boiling point, freezing

point, density

Topic: Electrical ChargesElectrical Charge is a property that allows an object to exert

force on another object without touching it.

Topic: Electrical ChargesElectrical Charge is related to

atoms and their particles:Electrons are negative

Protons are positive

Topic: Electrical FieldsElectrical Field is the space around which an object can exert a force:

•The force is stronger nearer the object.•The force is stronger is the charge is

large.

Topic: Electrical FieldsElectrical Field is the space around which an object can exert a force:

•The force is stronger nearer the object.•The force is stronger is the charge is

large.

Topic: Electrical FieldsElectrical Field is the space around which an object can exert a force:

•The force is stronger nearer the object.•The force is stronger is the charge is

large.

Topic: Electrical FieldsElectrical Field is the space around which an object can exert a force:

•The force is stronger nearer the object.•The force is stronger is the charge is

large.

Brain Break 1

Ask the person next to you:

What was the favorite dish you had during the break?

Topic: Static ChargeStatic Charge is the buildup of

electric charge in an object caused by the presence of many particles

with the same charge•Example:

•Balloon and hair•Balloon and paper

Opposites attract. And likes repel.

Topic: Static Charge

Charging objects can be done two ways:

1.Charging by contact2.Charging by induction

Topic: Static Charge

Charging objects can be done two ways:

1.Charging by contact- charges move when the

objects TOUCH

Topic: Static Charge

Charging objects can be done two ways:

1.Charging by induction- charges move without

TOUCH

Topic: Static Charge

Topic: Static ChargeCharge

Polarization is the process of separating

opposite charges within an object. The

positive charge becomes separated from the negative

charge.

Diagram the electric field lines for the following configuration of

two objects. Place arrows on your

field lines.

Which is an example of polarization?

Opposites attract. And likes repel.

Respond to the following student statement:

"A positively charged object is an object which has an excess of positive

electrons."

Topic: Charge Movement•Static Charges have Potential

Energy.•Potential Energy is stored energy.

Topic: Charge Movement•Static Charges have Potential

Energy.•Potential Energy is stored energy. •Electric Potential is the amount of

electric potential energy that a unit of charge has at a certain position in an

electric field.•Electric Potential is measured in

Volts

Topic: Charge Movement

•Charges can move only if there is a

DIFFERENCE in electric potential.

Topic: Charge Movement

•Charges can move only if there is a

DIFFERENCE in electric potential.

Examples of Charge Movement

“Static Shock”

Opposites attract. And likes repel.

Examples of Charge Movement

Lightning

Opposites attract. And likes repel.

Opposites attract. And likes repel.

Several electric field line patterns are shown in the diagrams below. Which of these patterns are incorrect? _________ Explain what is wrong with all incorrect diagrams.

                                                                                                           

Several electric field line patterns are shown in the diagrams below. Which of these patterns are incorrect? _________ Explain what is wrong with all incorrect diagrams.

                                                                                                           

Answer: C, D and EIn C, the lines are directed towards a positively charged object.In D, the lines are not symmetrically positioned despite the fact

that the object is a symmetrical sphere.In E, the lines are directed away from a negative charge.

Opposites attract. And likes repel.