Wk 14 Nov 15-19 (5)
Standards
PH 5. Electric and magnetic phenomena are related and have many practical applications. As a basis for understanding this
concept:
PH 5. e. Students know charged particles are sources of electric fields and are subject to the forces of the electric fields from other
charges.
Electrostatic force represents an interaction across space between two charged bodies. The magnitude of the force is expressed by a
relationship similar to that for the gravitational force between two bodies with mass. For both gravity and electricity, the force varies
inversely as the square of the distance between the two bodies. For two charges q and q separated by a distance r, the relationship is
1
2
called Coulomb’s law,
2
F = kq q /r , (eq. 37)
1 2
9
2
2
where k is a constant. Customary units for charge are coulombs (C), in which case k = 9 × 10 Nm /C
An electric field is a condition produced in space by the presence of charges. A field is said to exist in a region of space if a force can
be measured on a test charge in the region. Many different and complicated distributions of electric charge can produce the same
simple motion of a test charge and therefore the same simple field; for that reason it is usually easier to study first the effect of a model
field on a test charge and to consider only later what distribution of other charges might produce that field.
PH 5. h. Students know changing magnetic fields produce electric fields, thereby inducing currents in nearby conductors.
The concept of electromagnetic induction is based on the observation that changing magnetic fields create electric fields, just as
changing electric fields are sources of magnetic fields. In a conductor these induced electric fields can drive a current. The direction of
the induced current is always such as to oppose the changing magnetic field that caused it. This principle is called Lenz’s law.
Vocabulary
1.
2.
3.
4.
Charged bodies
Gravitational force
Electro-magnetic force
Coulomb’s law
5.
F = kq q /r
2
1 2
9
2
2
k = 9 × 10 Nm /C
6. Test charge
7. Changing magnetic fields produce electric fields
8. Induced currents
9. Electromagnetic induction
10. Lenz’s law
Standards Reading questions
Write & Answer
1. Do charged particles produce an electric field?
2. Are charged particles subject to the forces of the electric fields from other charges?
3. What does the Electrostatic force represent?
4. What relationship is like the magnitude of the force?
5. What does the force inversely depend upon?
6. What does the force directly depend upon? (Give all three)
7. What is the relationship that gives force dependents?
8. What does k stand for? Give value.
9. What must be present to create an electric field?
10.A field is said to exist in a region of space if a _______ can be measured on test
charge in the region.
11.Why is it easier to study first the effect of a model field on a test charge and to
consider only later what distribution of other charges might produce that field?
12.Changing __________ produce electric fields.
13.What is based on the observation that changing magnetic fields create electric fields?
14.In a conductor these___________ electric fields can drive a current.
15.The direction of the induced current is always ________ the changing …(fill in the
rest)_____________________________________________________________.
Agenda
M 11/15
None
T 11/16
W 11/17
CST review
CW
PEQ
Packet
HW
Vocab /
Ch 5 Read
w/Q’s
Packet
HandoutCoulomb’s law F
eq.
Ch 5
p.254-296
“Brochure”
due Friday
Packet
WorksheetCoulombs
Law Q’s
Finish
worksheet
Due friday
Qz
R 11/18
Vocab /
Read
Review
Packet
Packet
Study
Handout
woeksheet
F 11/19
Test
Name_______________ Per___ Grade__ Class_____ Assessments for Week___ Date______
Vocabulary
Review
1.
2.
3.
4.
5.
6.
7.
8.
9.
Charged bodies
Gravitational force
Electro-magnetic force
Coulomb’s law
9
2
2
k = 9 × 10 Nm /C
Test charge
Induced currents
Electromagnetic induction
Lenz’s law
a. Object with positive or negative net charge
b. force between two masses
2
c. F = kq1q2/r
d. Coulomb’s constant
e. Charge used to detect an E-field ”q2”
f. Observation that changing magnetic fields create
electric fields, just as changing electric fields are
sources of magnetic fields
g. force between two charged bodies
h. caused when a magnet moves in/out of coil
and a coil moves around a magnet
i. direction of the induced current is always such as
to oppose the changing magnetic field that caused
it
Reading
Review
1.
2.
3.
4.
Do charged particles produce an electric field?
What does the Electrostatic force represent?
What does k stand for? Give value.
What must be present to create an electric field?
Work Sheet Wednesday
Coulomb's Law
Static Electricity
Coulomb's Law can be states in equation form as
F =k Q1 Q2 / d2
This equation can be used as an algebraic recipe for solving computational problems or as a guide to thinking about how
an alteration in the quantity of charge or the distance between charged objects effects the amount of attractive or
repulsive force.
Using Coulomb's Law as a "Guide to Thinking"
Alteration in the Quantity of Charge
1. Two charged objects have a repulsive force of .080 N. If the charge of one of the objects is doubled, then what is the
new force?
2. Two charged objects have a repulsive force of .080 N. If the charge of both of the objects is doubled, then what is the
new force?
Alteration in the Distance between Charged Objects
3. Two charged objects have a repulsive force of .080 N. If the distance separating the objects is doubled, then what is the
new force?
4. Two charged objects have a repulsive force of .080 N. If the distance separating the objects is tripled, then what is the
new force?
5. Two charged objects have an attractive force of .080 N. If the distance separating the objects is quadrupled, then what
is the new force?
6. Two charged objects have a repulsive force of .080 N. If the distance separating the objects is halved, then what is the
new force?
Alteration in both the Quantity of Charge and the Distance
7. Two charged objects have a repulsive force of .080 N. If the charge of one of the objects is doubled, and the distance
separating the objects is doubled, then what is the new force?
8. Two charged objects have a repulsive force of .080 N. If the charge of both of the objects is doubled and the distance
separating the objects is doubled, then what is the new force?
9. Two charged objects have an attractive force of .080 N. If the charge of one of the objects is increased by a factor of
four, and the distance separating the objects is doubled, then what is the new force?
10. Two charged objects have an attractive force of .080 N. If the charge of one of the objects is tripled and the distance
separating the objects is tripled, then what is the new force?
Using Coulomb's Law as an "Algebraic Recipe"
11. A balloon with a charge of 4.0 x 10-5 C is held a distance of 0.10 m from a second balloon having the same charge.
Calculate the magnitude of the repulsive force. PSYW
12. Calculate the electrical force (in Newtons) exerted between a 22-gram balloon with a charge of -2.6 μC and a wool
sweater with a charge of +3.8 μC; the separation distance is 0.75 m. (NOTE: a μC or microCoulomb is a unit of charge;
106 μC = 1 C) PSYW
13. Suppose that two equally charged spheres attract each other with a force of -0.492 N ("-" means attractive) when
placed a distance of 29.1 cm from each other. Determine the charge of the spheres.
PSYW
14. A +5.0 μC charge and a -6.0 μC charge experience an attractive force of -0.72 N ("-" means attractive).
Determine their separation distance. PSYW
15. A balloon has been rubbed with wool to give it a charge of -1.0 x 10-6 C. A plastic tube with a charge of +4.0 x 10-6 C
is held a distance of 0.50 m above the balloon. Determine the electrical force of attraction between the tube and the
balloon. PSYW
16. In the space at the right, construct a free-body diagram showing thedirection and the type of all forces acting upon
the 30.0-gram balloon.Will the balloon accelerate up, down, or not at all? _____________If there is an acceleration,
then calculate its value. (Assume that the plastic tube is held a constantdistance of 0.5 m from the balloon.) PSYW
Name_____________________________ Per____ Grade___ Class ICS1 WK# 14 Date 11/15-19 Topic Physics
1.
Title E-M
2.
Objective
3.
Overview
4.
Standard
Fields
To understand the relationship between electricity, charged particles
and magnetic fields.
Electrostatic energy is considered a force. When you get
Shocked you experience a force that is equal to the electrons
involved and the distance between the two surfaces. I.e. the
electron and your hand, or the electron and the TV
When an electric field exists a magnetic field is present as
well. Charged Particles in motion cause E-M fields to be
present.
PH 5. e. Students know charged particles are sources of electric fields and are subject to the forces of the
electric fields from other charges.
PH 5. h. Students know changing magnetic fields produce electric fields, thereby inducing currents in nearby
conductors.
5.
Analyzed Standard- (3-sentences)
____________________________________________________________________________________________________________
____________________________________________________________________________________________________________
____________________________________________________________________________________________________________
____________________________________________________________________________________________________________
6.
Graphic Organizer-
Creates
Electric and
Magnetic
Field felt by
test charge
Charged
Particle
7. Pivot Points- What you know as of Monday
Protons in the
nucleus are Positive
(+) and Electrons
“Clouding” the
Nucleus are
Negative (-). The
polarity of the
particle can be
detected by a
compass needle
Current in a coil of wire creates both electric and
magnetic fields that are perpendicular to the current
and each other. The E-M field can be detected in the
wire or outside the wire by a Test Charge and
Coulomb’s Law
Topic
1.
Coulomb’s
2. E-M
field
3. Coil of
Wire
4.
Compass
Know …(Standards)
8. Inquiry Activity
Developing Observation Skills:
a. Give the features.
9. Interpreting Activity
Developing Inferring Skills:
a. What is given?
Charge particle and e-fields
Phet solution e-field patterns demo
b.
b.
c.
What can be reasoned?
Describe the features.
e-field goes down in all pic’s
test charge changes direction
based on charge type and if a force
is given
Uses in the scientific
community.
c.
9
2
How does doubling the distance increase the
Force felt by the test charge, in the math skills
Problem?
2
= (9 × 109 )(1.5 x 107 ) (2.0 x 108 ) N
___________________________________
(3.0 x 104)2
= (9.0)(1.5)(2.0) x 109+7+8 N
______________________
9 x 104+4
9.0 x 108
N
Describe the action and give reason
12. Critical Thinking
___________________________________
(3.0 x 104m)2
_____________
c.
Understanding of e-field can give charge
characteristics, current, magnitude,
composition…
F = (9 × 109 Nm2/C 2 )(1.5 x 107 C) (2.0 x 108 C)
= 27.0 x 1024
What can you infer?
What does this lead to?
2
k = 9 × 10 Nm /C
q1 = 1.5 x 107 C
q2 = 2.0 x 108 C
r = 3.0 x 104 m
b.
Charge type influences e-field direction
11. Math Skills
F = k q1q2/r
10. Exploration Activity
Developing Analysis Skills:
a. State observations?
= 3.0 x 1016 N
13. Notes -tuesday
Phet solutions
Balloon and shirt
demo
Static increased hold negative charge
Phet E_M field
direction of E-field from charge
positive charge: away
negative charge: toward
III.
E-M fieldbattery or current
in wire
positive charge has a flow of electrons “away”
negative charge has a flow of electrons “toward”
adding electrons increase collision in a wire and increases
“energy flow” current, because volume of the wire is
constant
IV.
Coil of wire
Electrons flowing around in circles in a wire cause E-M
fields to be produced. The right hand rule can help tell the
direction of each.
I.
II.
Summary
Same charge type –“push” Opposite charge type-“pull”
Thursday On your own paper
14. Dispatch-
The force of two charged particles is 1 x 106 N.
If the charge of 1 is doubled, the charge of
the other is tripled, and the distance between
them is halved?
1 x 106 x (2) x (3) / (1/2)2 = ____
Following from a presentation on cd: use notes for help
15. Phet solutions
Why did the balloon hold the negative charge?
Static increased or decreased
Why was the balloon pushed by the wall?
Same or Opposite charge type
Why was the balloon pulled by the Sweatshirt?
Same or Opposite charge type
16. Phet E_M field
What direction does the E-field point:
a) from a positive charge: away or toward
b) from a negative charge: away or toward ____
17. E-M field
“Remember the positive charge has a
flow of electrons ____”
Why did adding electrons increase
the chance of a collision?
18.
Pivot Points-Learned
Topic
1. Coulomb’s
2. E-M field
3. Coil of
Wire
4. Compass
Learned…
19. Understanding and Applying
Name _____________________________Period _____ Date ____________ handout Tuesday
1. F = k q1q2/r
9
2
2
k = 9 × 10 Nm /C
q1 = 1.5 x 107 C
q2 = 2.0 x 108 C
r = 3.0 x 104 m
2
F=
3.
9
2
2
k = 9 × 10 Nm /C
q1 = 2.0 x 10-3 C
q2 = 2.0 x 108 C
r = 3.0 x 102 m
F=
5.
9
2
2
k = 9 × 10 Nm /C
q1 = 5.0 x 10-2 C
q2 = 1.0 x 10-1 C
r = 3.0 x 1012 m
F=
7.
9
2
2
k = 9 × 10 Nm /C
q1 = 2.5 x 107 C
q2 = 2.0 x 1010 C
r = 3.0 x 104 m
F=
2.
9
2
2
k = 9 × 10 Nm /C
q1 = 5.0 x 10-3 C
q2 = 2.0 x 108 C
r = 9.0 x 102 m
F=
4.
9
2
2
k = 9 × 10 Nm /C
q1 = 0.5 x 102 C
q2 = 6.0 x 109 C
r = 3.0 x 10-2 m
F=
6.
9
2
2
k = 9 × 10 Nm /C
q1 = 4.0 x 105 C
q2 = 2.0 x 102 C
r = 8.0 x 105 m
F=
8.
9
2
2
k = 9 × 10 Nm /C
q1 = 2.0 x 101 C
q2 = 2.0 x 101 C
r = 6.0 x 104 m
F=