Download Due Next Class - Uplift Meridian

Due Next Class:
•
House Project Check-In #2
Create Initial Floor Plan Draft
•
New Vocab (total 36)
• Electric Field, E
Do Now:
1. Walk in silently.
2. Grab a calculator and any papers for today.
3.
4.
Put your HW on your desk ready to grade.
Summarize last class in exactly 10 words.
SOI : The many components of
a system and their
arrangement in context of the
whole can dramatically
change the operation of the
system.
By the end of the day today,
IWBAT…
• model the electric field using
field lines and calculate the
electric field strength on a test
charge or charge in that field.
Why it matters in LIFE:
Part of being a
functional human
being is being able to
understand what’s
happening in the world
around you!
Why it matters in THIS CLASS:
Our Goal = 80%
Mastering today’s lesson (focused
participation, asking questions, etc)
is the first brick that will help us
reach our goal for this unit, and
eventually for the year
TEKS:
5(C) describe and calculate
how the magnitude of the
electrical force between two
objects depends on their
charges and the distance
between them
By the end of today, IWBAT…
•model the electric field using
field lines and calculate the
electric field strength on a test
charge or charge in that field.
Topic:
Electric Fields
WHAT IT MIGHT LOOK LIKE ON A TEST:
Let’s demonstrate!
CHARGED OBJECTS
A charged object has an invisible property
called “electric field” that shows the
electrical force and allows it to do work on
other charged objects.
Because we can’t normally
see it, we like to draw it so
we can understand and
make predictions!
ELECTRIC FIELD
Electric field lines are drawn based on what
would happen if a positive “test” charge was
placed near the charged object.
ELECTRIC FIELD
POSITIVELY CHARGED OBJECT
If we place a positive “test” charge near a
positively charged object, what will happen
to the test charge?
+
+
ELECTRIC FIELD
POSITIVELY CHARGED OBJECT
If we place a positive “test” charge near a
positively charged object, what will happen
to the test charge?
+
+
Like charges
repel!
ELECTRIC FIELD
POSITIVELY CHARGED OBJECT
So we draw field lines radiating outward from
a positively charged object.
+
ELECTRIC FIELD
NEGATIVELY CHARGED OBJECT
If we place a positive “test” charge near a
negatively charged object, what will happen
to the test charge?
-
+
ELECTRIC FIELD
NEGATIVELY CHARGED OBJECT
If we place a positive “test” charge near a
negatively charged object, what will happen
to the test charge?
-
+
Opposite
charges attract!
ELECTRIC FIELD
NEGATIVELY CHARGED OBJECT
So we draw field lines radiating toward a
negatively charged object.
-
WHAT IT MIGHT LOOK LIKE ON A TEST:
What does the electric
field look like with
more than one
charged object?
VOCAB CARDS
LIGHTNING
ROUND!
ELECTRIC FIELD STRENGTH
Just how strong is
the electric field?
ELECTRIC FIELD STRENGTH, E
Units Newtons/Coulomb (N/C)
𝐹𝑒
𝐸=
𝑞0
Force on the test
particle
Charge of the test
particle
EXAMPLE 1
1 μC = 1 x 10 - 6 C
A positive test charge of 1.0 x 10-6 C is in an electric field that
exerts a force of 2.0 x 10-4 N on it. What is the magnitude of
the electric field at the location of the test charge?
G: Fe = 2.0 x 10 -4
q0 = 1.0 x 10 -6
U: E = ?
E: E = Fe
---------
q0
S: E = 200 N/C
ELECTROSTATIC FORCE
GUIDED PRACTICE!
Complete the GP with your partner!
INDEPENDENT PRACTICE!
Procedure for IP time:
1)
Silent work time
2) Try and solve without notes first!
Hierarchy of who to ask
1) Your brain
2) Your notes
3) Ms. Kelly (after you #embracethestruggle)
EXIT TICKET
A positive test charge of 5.0 x 10-6 C is in an electric field
that exerts a force of 2.0 x 10-4 N on it. What is the
magnitude of the electric field at the location of the test
charge?
EXIT TICKET
A positive test charge of 5.0 x 10-6 C is in an electric field
that exerts a force of 2.0 x 10-4 N on it. What is the
magnitude of the electric field at the location of the test
charge?
E = 40 N/C
G: Fe = 2.0 x 10 -4
q0 = 1.0 x 10 -6
U: E = ?
E: E = Fe
---------
q0
S: E = 40 N/C