Bellwork What parts of the atom have electric charge? The electron and proton.
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Transcript of Bellwork What parts of the atom have electric charge? The electron and proton.
BellworkBellwork
What parts of the atom have What parts of the atom have electric charge?electric charge?
The electron and protonThe electron and proton
Cartoon and Cartoon and Advertisement Advertisement ProjectProject2/5/142/5/14
PresentingPresentingThe PresenterThe Presenter: (Extra Credit) : (Extra Credit) Introduce yourselfIntroduce yourself Present your cartoon / advertisementPresent your cartoon / advertisement Explain how it relates to the physics Explain how it relates to the physics
topicstopicsThe AudienceThe Audience: (Your C.W. Assignment): (Your C.W. Assignment) Presenter’s namePresenter’s name As someone is presenting briefly As someone is presenting briefly
describe the cartoon / advertisement.describe the cartoon / advertisement. What topic did the cartoon / What topic did the cartoon /
advertisement cover?advertisement cover?
AssignmentsAssignments
Cartoon, advertisement and Cartoon, advertisement and descriptions together in the descriptions together in the cabinetcabinet
Pass the class-work Pass the class-work assignment forwardassignment forward
Electric Force and Electric Force and Electric Field LinesElectric Field Lines
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Electric ForceElectric Force
Electric force is an action at a distance Electric force is an action at a distance forceforce
Can be attractive or repulsiveCan be attractive or repulsiveDifferent from gravity, which is an Different from gravity, which is an
attractive force.attractive force.
Electric Field LinesElectric Field Lines
Electric Field LinesElectric Field Lines: A way to represent : A way to represent the electric field around chargesthe electric field around charges
New QuantitiesNew QuantitiesChargeCharge (scalar): (scalar):
variable (equations): qunit (measured in): coulombs (C)
Electric ForceElectric Force (vector): (vector):
Variable: Felec
Unit: newton (N)Electric FieldElectric Field (vector): (vector):
Variable: Efield
Unit: newtons per coulomb (N/C)
Electrostatics Notes and Homework Assignment
• Read pages 500-514 and outline in your notes, there will questions about the information on a future Pop Quiz.
• Answer questions #1-25, in complete sentences, on page 515-516 to be turned in. (Due on Fri. 2/7/14)
Bellwork (2/7/14)Bellwork (2/7/14)
Turn in Electrostatic questions #1-25Turn in Electrostatic questions #1-25What is Mr. Z.’s favorite YouTube video What is Mr. Z.’s favorite YouTube video
of 2013?of 2013?
CalendarCalendar
Today – Electric Field LinesToday – Electric Field LinesMon. 2/10 – E-Field Lab dueMon. 2/10 – E-Field Lab dueTues. 2/11 – E-Field H.W. dueTues. 2/11 – E-Field H.W. due
Electric Field LinesElectric Field Lines
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Electric Field LinesElectric Field Lines1.1. Lines start on positive charges and end on Lines start on positive charges and end on
negative chargesnegative charges2.2. Label the chargesLabel the charges3.3. The number of lines represents the The number of lines represents the
magnitude of the charge magnitude of the charge (1 charge = 4 lines)4.4. Field lines cannot cross each otherField lines cannot cross each other5.5. Field lines must start or end on charges or Field lines must start or end on charges or
extend out to or from infinityextend out to or from infinity6.6. Field lines should show the electric field Field lines should show the electric field
between the charges evenlybetween the charges evenly7.7. Density of field lines represents the electric Density of field lines represents the electric
field strengthfield strength
Examples
Example #1: Two charges where one is +3q and the other is -3q
Example #2: Two charges where one is -2q and the other is -3q