Ch. 2 Sec. 1 Electric Charge & Static Electricity

YouTube video-Bill Nye Static Electricity

Interactions Between ChargesInteractions Between Charges

• same

• differentrepel

attract

electric field

• exerts force on other charged particles

• extends outward from every charged particle

static electricity

•buildup of charges on an object

– charges build up - do not flow

•neutral object becomes charged by gaining or losing electrons

• loses electronsmore protons positively charged

• gains electronsmore electrons negatively charged

++++

+

-

----

-

+ -+

+ - -

STATIC TUBE ACTIVITYMATERIAL PREDICTION

# 1-5

(1= MOST

5= LEAST)

# OF STYROFOAM

PELLETS

COTTON (purple)COTTON (purple)

RAYON (red)RAYON (red)

NYLON (white)NYLON (white)

SILK (yellow)SILK (yellow)

WOOLWOOL (brown tweed) (brown tweed)

3 methods by which

charges are transferred

friction conduction induction

frictionfriction

• transfer of electrons by rubbing

conconductionduction

• transfer of electrons by direct concontact

inductioninduction

•movement of electrons caused by electric field of another object

Examples of Static Cling

–clothes sticking together in clothes dryer

–wrapping food with plastic wrap

–using a photocopier

• when negatively charged object & positively charged object brought together electrons move until both objects have same charge

static discharge • loss of static electricity as electric charges move off an object

Lightning is a dramatic example of static discharge.

● electroscope

instrument that detects electric charge

Van de Graaff generator

• Produces static electricity

• Electrons are carried up a rubber belt & are transferred to the metal sphere

• The charge built up on the sphere is enough to send a spark several meters through the air.

Activity-The Versorium pg. 42

Unrubbed foam plate

Rubbed foam plate

Rubbed wool fabric

Aluminum Tent: Prediction

Aluminum Tent:

Observation

Paper Tent: Prediction

Paper Tent:

Observation