Embedded Files
W 3/12
Th 3/13
F 3/14
M 3/17
🟢 5: W 3/12💻 - superposition of force
🟢 5: W 3/12💻 - superposition of force
NJ GPA Testing
Test - 7:40 - 9:35 (115)
1 - 9:40 - 10:20 (40)
2 - 10:25 - 11:05 (40)
3 - 11:10 - 11:50 (40)
L - 11:54 - 12:35 (41)
4 - 12:40 - 1:20 (40)
5 - 1:25 - 2:05 (40)
6 - 2:10 - 2:50 (40)
Today, we will learn about the principle of superposition by finishing the Coulomb's Law Presentation. Remember that force is a vector quantity.
With the time remaining, you may work on Coulomb's Law problems by doing 📖 Coulomb's Law textbook problems #10, 11, 13, 14, 19, 67.
Homework: Finish these problems.
Optional Enrichment: Demonstrate your ability to apply an old concept to a new concept - superposition of electric force - by doing 📖 Mastering Physics "Ch 20 - superposition of electric force" textbook problems #17, 18, 56, 58, 61, 67, 68. In these problems, you will demonstrate your ability to quantify the force due to a configuration of multiple charges in space.
If you missed class or are looking for additional support on the principle of superposition, watch the following video:
🟩❗5: F 3/14💻 - electric field
🟩❗5: F 3/14💻 - electric field
First, you will watch the following video at your own pace. Pause, rewind, re-watch, and take notes. Then, complete the 📄 Electric Field Worksheet (PH).
If you finish early, move on to the next lesson which is longer.
Homework: Finish the 📄 Electric Field Worksheet (PH) which will be collected at the beginning of next class.
NJ GPA Testing
Test - 7:40 - 9:35 (115)
1 - 9:40 - 10:20 (40)
2 - 10:25 - 11:05 (40)
3 - 11:10 - 11:50 (40)
L - 11:54 - 12:35 (41)
4 - 12:40 - 1:20 (40)
5 - 1:25 - 2:05 (40)
6 - 2:10 - 2:50 (40)
Today, we'll discover what a field is by looking a gravitational fields with which we are a little bit familiar. We'll discuss what an electric field looks like and how to represent it with electric field lines. Finally, we will learn how to characterize and quantify the strength of an electric field by expressing the force per Coulomb.
💚 5: M 3/17 - 📖 E-field superposition
💚 5: M 3/17 - 📖 E-field superposition
"If there is more than one charge creating an electric field, then the total, or net, electric field at any point is found using the superposition principle for electric fields, which can be stated as follows: For a configuration of charges, the total, or net, electric field at any point is the vector sum of the electric fields due to the individual charges of the configuration."
We'll learn about the superposition of electric field by going through some problems in this Electric Field Presentation. When you're doing these types of problems, imagine that you are putting a small POSITIVE test charge at the location where you're trying to find the electric field, and draw the electric field contributions from each individual charge in the configuration (same as the direction of force on the positive test charge). Then add vectors in a vector kind of way: separate into x- and y-components, add x-components, add y-components, put together with Pythagorean Theorem to find magnitude, and use arctan to find direction.
Then, we'll try to collectively figure out what an electric field looks like around various configurations of charges by using the simulation found at https://phet.colorado.edu/sims/html/charges-and-fields/latest/charges-and-fields_en.html. Read the beginning of section 20.5 on pages 713-714 in your textbook to get an idea of how to draw electric field vectors using superposition.
Watch directions for this activity here (sorry for the low res, but you'll get the idea), and review the Electric Field Superposition "May the Field Be With You" activity.
Also, read the five general rules for electric field lines:
The general rules for sketching and interpreting electric field lines are as follows:
The closer together the field lines, the stronger the electric field.
At any point, the direction of the electric field is tangent to the field lines.
The electric field lines start at positive charges and end at negative charges.
The number of lines leaving or entering a charge is proportional to the magnitude of the charge.
Electric field lines never cross.
Finally, you'll practice solving problems with electric fields in 📖 electric fields textbook problems #20, 21, 44, 60, 65, 71, plus "electric field due to two point charges", but I recommend you finish these by next class so you can ask questions if you have them before the quiz.
Handout: Electric Field Superposition "May the Field Be With You"
Homework: QUIZ on electric field and force Thursday, March 20th. Finish 📖 electric fields textbook problems and Electric Field Superposition "May the Field Be With You".
Optional Extra Practice: FYP: Coulomb's Law. Solutions (plus #9 solution)
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