Download Unit 6: Optics - APPhysicsTeacher

 Lesson
Steps: Introduce E&M with Video;
Explorer learning registration; Ready, Set,
Gizmo!
 Do
Now: What do you know about electrons,
protons and current?
 Homework:
None – yet…

Lesson Steps:
Introduce the big picture
LIBRARY
1.
2.




E&M Notes
Assignment 1 (Vocab, Bookwork and Questions)
Explorer learning registration
Gizmo!
All of this will be due on 4/17, so pace yourself
accordingly!

Do Now: Get a copy of “Pith Ball Lab” and attach
it to your notebook.

Homework: None – yet…
Since you are now responsible for vocab terms and
questions to go along with the notes, you can expect a
notebook quiz at the end of each assignment.
I WILL go over correct definitions/answers with you
in class before the quiz.
However, it is YOUR job, not mine, to make sure
that you have the correct definition. Your classwork
grades will be dependent on completeness, citations
and effort. NOT CORRECTNESS.
You can expect a notebook quiz before we begin
chapters 19 and 20. That means April 19th and 20th.

Lesson Steps:
Introduce the big picture
LIBRARY
1.
2.
E&M Notes

Assignment 1 (Vocab, Bookwork and Questions)

Explorer learning registration

Gizmo!
All of this will be due on 4/18, so pace yourself
accordingly!


Do Now: Get a copy of “Pith Ball Lab” and attach
it to your notebook.

Homework: None – yet…
Since you are now responsible for vocab terms and
questions to go along with the notes, you can expect a
notebook quiz at the end of each assignment.
I WILL go over correct definitions/answers with you
in class before the quiz.
However, it is YOUR job, not mine, to make sure
that you have the correct definition. Your classwork
grades will be dependent on completeness, citations
and effort. NOT CORRECTNESS.
You can expect a notebook quiz before we begin
chapters 19 and 20. That means April 19th and 20th.
1.
2.
3.
Answer all “Questions” in your notebook.
Cite where you found your answers if you
looked ‘em up (but I would recommend
your textbook here…).
Define any term that is underlined and
italicized in your notebook. You may use
your textbook, a dictionary or the internet.
CITE YOUR SOURCE, even if it’s yourself!
Bookwork! (in your notebook)
Weird… it all
goes in my
notebook…!
Chapters 17 - 20
 Objectives:

Understand basic properties of electric charge



Differentiate between conductors and insulators and
the 3 methods of charging
Coulomb’s Law
Electric Field strength
 Two
types of charge carriers: protons
(positive) and electrons (negative). Their
charge is conserved and quantized.


Question 1: What is the charge/mass of a proton?
An electron? Include units!
Question 2: Who figured this out? How?
 There
are two types of materials: conductors
and insulators.
 Three ways to charge an object: contact,
induction and polarization.

Question 3: What methods of charging work for
what materials?
 Coulomb’s
Law describes the FORCE generated
by two electric charges separated by a distance:
𝑞 1 𝑞2
𝐹𝑒𝑙𝑒𝑐𝑡𝑟𝑖𝑐 = 𝑘𝐶 2
𝑟


Question 4: What do each of these variables stand
for? What are the units?
Question 5: Write a word problem for your new
equation! (Check out the book if you need some
examples.)
 Electric

Force is a field force, much like gravity.
Question 6: Which field force is stronger, gravity or
electric force? What do they have in common?
 The
electric field is represented with the
following equation which supposes that a
small, positive test charge (q0) is brought in
to test the strength of the field made by q.
𝑘 𝐶𝑞
𝐹𝑒𝑙𝑒𝑐𝑡𝑟𝑖𝑐
𝐸= 𝑞 = 2
0
𝑟


Question 7: What is the equation for the electric
field strength from a point charge?
Electric field lines always point from a
positive charge to the negative charge.

Question 8: Draw the electric field lines for a:
a)
b)
+3 C charge and a -6 C charge at a distance, r.
+3 C charge and a +6 C charge at a distance, r.
 Conductors
in electrostatic equilibrium
follow four main rules:
1.
2.
3.
4.

The E-field is zero inside the conductor
Any excess charge is on the surface
The E-field just outside the conductor is
perpendicular to the surface
If the surface is irregular, the majority of the
charge will be at the sharp points.
Question 9: Draw this for both a sphere and an
irregular shape of your choice.
 Objectives:



Define and compute electrical potential energy
for various charge distributions
Distinguish between electrical potential energy,
electric potential and potential difference
Calculate the capacitance of various devices and
how much energy is stored in a capacitor
 There
are two equations for electric
potential energy:



In a uniform electric field:
𝑃𝐸𝑒𝑙𝑒𝑐𝑡𝑟𝑖𝑐 = −𝑞𝐸𝑑
For a pair of charges:
𝑞1𝑞2
𝑃𝐸𝑒𝑙𝑒𝑐𝑡𝑟𝑖𝑐 = 𝑘𝐶
𝑟
Question 10: What do each of the variables stand
for? What are their units?
 It
is important to understand the difference
between electric potential and potential
difference.

Question 11: What is this difference? (Explain in your
own words!)
 There
are three equations for potential
difference.



General: ∆𝑉 = ∆𝑃𝐸𝑒𝑙𝑒𝑐𝑡𝑟𝑖𝑐 𝑞
In a uniform electric field: ∆𝑉 = - E∆d
Between a point charge and a point charge at
𝑞
infinity: ∆𝑉 = 𝑘𝐶
𝑟

Question 12: What do each of the terms mean? What
are their units?
Capacitance is used in a lot of electric circuits, from
cars to radios. The most general equation that
represents it is:
𝑄
𝐶=
∆𝑉
 In some cases, capacitance takes place in a vacuum.
That is defined as:
𝐶 = 𝜀0 𝐴𝑑

Question 13: What is capacitance dependent on?
 Question 14: How do you use a capacitor in a circuit?


You can relate the electric potential of a circuit to
the capacitance though:
𝑃𝐸𝑒𝑙𝑒𝑐𝑡𝑟𝑖𝑐 = 12𝑄∆𝑉

Question 15: What do each of the variables in these 3
equations stand for? What are their units?
Page:
Number:
633
1
636
2a
669
18A: 2; SR: 1, 2
673
1
675
4
681
2
1.
2.
3.
Answer all “Questions” in your notebook.
Cite where you found your answers if you
looked ‘em up (but I would recommend
your textbook here…).
Define any term that is underlined and
italicized in your notebook. You may use
your textbook, a dictionary or the internet.
CITE YOUR SOURCE, even if it’s yourself!
Bookwork! (in your notebook)
Weird… it all
goes in my
notebook…!

Lesson Steps: Keep on with everything that is
due in class on 4/17 (that’s next class…):




E&M Notes
Assignment 1 (Vocab, Bookwork and Questions)
Explorer learning registration
Gizmo!

Do Now: What do you know about electrons,
protons and current?

Homework: Make sure you have enough done to
hand everything in on Tuesday by the last 30
minutes of class!

Lesson Steps: Keep on with everything that is
due in class on 4/18 (that’s next class…):




E&M Notes
Assignment 1 (Vocab, Bookwork and Questions)
Explorer learning registration
Gizmo!

Do Now: What do you know about electrons,
protons and current?

Homework: Make sure you have enough done to
hand everything in on Wednesday by the last 30
minutes of class!
 Lesson
Steps: LIBRARY! Everything is due by
the last 30 minutes of class TODAY! Then go
over solutions!




E&M Notes
Assignment 1 (Vocab, Bookwork and Questions)
Explorer learning registration
Gizmo!
 Do
Now: Any big questions about the work
you’re turning in?
 Homework:
None, you should be done!
 Lesson
Steps: LIBRARY! Everything is due by
the last 30 minutes of class TODAY! Then go
over solutions!




E&M Notes
Assignment 1 (Vocab, Bookwork and Questions)
Explorer learning registration
Gizmo!
 Do
Now: Any big questions about the work
you’re turning in?
 Homework:
None, you should be done!
We will start chapters 19 and 20. You can
expect Assignment 2 due sometime the
following week.
 Objectives:

Describe and solve problems relating to electric
current. Understand various speeds and types of
current.


Understand and be able to calculate resistance.


I = ΔQ/Δt
ΔV = IR
Relate and calculate electric power to known
terms.

P = IΔV = I2R = ΔV2/R
 Objectives:


Interpret and construct circuit diagrams
Differentiate and calculate equivalent resistance
of resistors



Differentiate and calculate equivalent current



In series: Req = R1 + R2 + R3 + …
In parallel: 1/Req = 1/R1 + 1/R2 + 1/R3 + …
In series: 1/Ieq = 1/I1 + 1/I2 + 1/I3 + …
In parallel: Ieq = I1 + I2 + I3 + …
Understand and apply the concept that magnets
can induce a current (p. 776)