1. Bellwork  What parts of the atom have electric charge?  The electron and proton

2. Cartoon and Advertisement Project 2/5/14

3. Presenting The Presenter: (Extra Credit)  Introduce yourself  Present your cartoon / advertisement  Explain how it relates to the physics topics The Audience: (Your C.W. Assignment)  Presenter’s name  As someone is presenting briefly describe the cartoon / advertisement.  What topic did the cartoon / advertisement cover?

4. Assignments  Cartoon, advertisement and descriptions together in the cabinet  Pass the class-work assignment forward

5. Electric Force and Electric Field Lines 2/5/14

6. Electric Force Electric force is an action at a distance force Electric force is an action at a distance force Can be attractive or repulsive Can be attractive or repulsive Different from gravity, which is an attractive force. Different from gravity, which is an attractive force.

7. Electric Field Lines Electric Field Lines: A way to represent the electric field around charges Electric Field Lines: A way to represent the electric field around charges

8. New Quantities Charge (scalar): Charge (scalar): variable (equations): q unit (measured in): coulombs (C) Electric Force (vector): Electric Force (vector): Variable: F elec Unit: newton (N) Electric Field (vector): Electric Field (vector): Variable: E field Unit: newtons per coulomb (N/C)

9. 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)

10. Bellwork (2/7/14) Turn in Electrostatic questions #1-25 Turn in Electrostatic questions #1-25 What is Mr. Z.’s favorite YouTube video of 2013? What is Mr. Z.’s favorite YouTube video of 2013?

11. Calendar Today – Electric Field Lines Today – Electric Field Lines Mon. 2/10 – E-Field Lab due Mon. 2/10 – E-Field Lab due Tues. 2/11 – E-Field H.W. due Tues. 2/11 – E-Field H.W. due

12. Electric Field Lines 2/7/14

13. 1.Lines start on positive charges and end on negative charges 2.Label the charges 3.The number of lines represents the magnitude of the charge 3.The number of lines represents the magnitude of the charge (1 charge = 4 lines) 4.Field lines cannot cross each other 5.Field lines must start or end on charges or extend out to or from infinity 6.Field lines should show the electric field between the charges evenly 7.Density of field lines represents the electric field strength

14. 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