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Intro

Explore the world of electrostatics, including concepts like like and opposite charges, electric force, charging by conduction and induction, and the relationship between force and distance.

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Intro

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Presentation Transcript

  1. Intro • Size of electron and electron orbit in respect to perceived matter. • Force: electron and proton vs. gravity • Tape, wool, balloon, paper punch holes, graphite styrofoam balls

  2. Warm up b • Given: • a=3, b=3 • Find  • Given: • a=4, b=7 • Find  • Given: • a=5, b=8 • Find  a c 

  3. Electrostatics Force and Charge

  4. Charges • Like charges repel • Opposite charges attract

  5. Like charges • Each strip of clear tape has the same type of charge when prepared in the same manner (i.e. both positive or both negative) • These strips of tape repel each other

  6. Opposite charges • When one strip is peeled from the roll and one strip is peel from the desk, the charges are opposite. • These strips of tape attract each other.

  7. Electrostatic related words • Neutral • Equal number of positive and negative charges • Insulator • Charge does not move easily through this material (e.g. plastic or styrofoam) • Conductor • Charge moves easily through this material (e.g. metals)

  8. Electric Force Force between two point sources

  9. Electric force • Two kinds of electric charges: positive and negative • Charges exert forces on other charges at a distance (contact not required) • The force decreases with distance • Like charges repel; opposite charges attract.

  10. Electroscope • Charging by conduction: object come into contact • Charging by induction: object are in proximity but never touch (requires grounding) • Examples • Wool • Monitor • Tape • Balloon • Van Degraff • Plastic Example: electroscope

  11. Charging by conduction • A charge is created on an object. • The object is brought into contact with another object. • The electrons transfer to even out the distribution Example: pans

  12. Charging by induction • Charge is created on an object. • The object is brought near another object (which is grounded). • The charged object repels or attract electrons on the grounded object. • The grounded object transfers electrons to or from the ground to reach equilibrium. • If the ground is removed, the previously grounded object will have an unbalanced number of electrons and now be charged. Example: styrofoam

  13. Force and distance • Force increases with charge • Force decreases with distance

  14. Proportional to the inverse square • qA=10C, qB=10C • r=1mm • r=1.414mm • r=2mm • r=3mm • r=4mm • r=5mm • r=6mm • Find the pattern Pg 552 #11

  15. Homework • Pg 557: • Explain Key Concepts in your own words. • Relate to your things you experience in real life. • Ch 20 Study Guide • Pg 558 #20-40 • Pg 559 #42-49, 51,59,60

  16. Concepts section 1

  17. Concepts section 2

  18. Your Topic Goes Here • Your Subtopics Go Here

  19. Your Topic Goes Here • Your Subtopics Go Here

  20. TRANSITIONAL PAGE

  21. elements www.animationfactory.com

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