Complete the concept map comparing series circuits to parallel circuits. Materials Managers – get the journals for your team Practice Sheet #23 is due tomorrow! D. F. Goldsberry Cooper Middle School
Complete the concept map
comparing series circuits to parallel
circuits.
Materials Managers – get the journals
for your team
Practice Sheet #23 is due tomorrow!
D. F. Goldsberry Cooper Middle School
D. F. Goldsberry Cooper Middle School
D. F. Goldsberry Cooper Middle School
What is the key difference that
causes one atom of one element
to be different from an atom of a
different element?
The number of protons in the atom
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What happens when elements
form a mixture?
Elements keep their original
properties because there is no
chemical reaction.
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Review the structure of the atom.
Name the three subatomic particles, their
charges, and their locations.
Protons are positive and are found in the
nucleus.
Neutrons are neutral and are also found
in the nucleus.
Electrons are negative and are found in
the electron cloud outside the nucleus.
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The amount of matter present before
a change is the same as the amount
present after the change.
What does the Law of Conservation
of Matter say?
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How is a mixture different from a pure
substance?
In a pure substance all the particles are
the same kind of atoms or molecules. In a
mixture, there are different kinds of atoms
or molecules.
A mixture can be separated by physical
means and each ingredient in a mixture
retains its own chemical identity.
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S8P5. Students will recognize characteristics of
gravity, electricity, and magnetism as major
kinds of forces acting in nature.
b. Demonstrate the advantages and
disadvantages of series and parallel circuits and
how they transfer energy.
c. Investigate and explain that electric currents
and magnets can exert force on each other.
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What is the difference
between a motor and a
generator?
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Why does a compass point
to the Earth’s North Pole?
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Key Idea
A compass points to the
Earth’s North Pole because
the Earth acts like a giant
magnet. (The core of the
Earth is mostly molten
iron.) D. F. Goldsberry Cooper Middle School
Earth has a north
magnetic pole and a south
magnetic pole.
D. F. Goldsberry Cooper Middle School
Earth’s magnetic poles
are not exactly the same
locations as the
geographic poles (axis
where the Earth spins).
D. F. Goldsberry Cooper Middle School
D. F. Goldsberry Cooper Middle School
A compass can be used to
find directions because its
needle lines up with the
Earth’s magnetic poles.
D. F. Goldsberry Cooper Middle School
D. F. Goldsberry Cooper Middle School
Consider the following:
What would happen to the
magnetic properties of a
bar magnetic if you cut it
into two pieces?
D. F. Goldsberry Cooper Middle School
D. F. Goldsberry Cooper Middle School
How can a magnet lose its
magnetic properties?
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Record in your notes:
Losing Magnetic Alignment by:
a) Dropping a magnet or hitting it too hard
b) Putting magnet in opposite field for too
long
c) Increasing the temperature
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Key Idea
An electromagnet is a coil of current-carrying wire that acts as a magnet that can be turned on and off.
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Solenoid = a current-carrying coil of wire with many loops.
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When a solenoid is turned on, a magnetic field is created.
Record in your notes
D. F. Goldsberry Cooper Middle School
If a piece of iron or other ferromagnetic material is wrapped by the coils of wire in a solenoid, a magnet is created when the current is turned on.
Record in your notes
D. F. Goldsberry Cooper Middle School
The strength of an electromagnet
can be increased by:
1) Increasing the electric current in
the solenoid
2) Increasing the number of coil
loops around the ferromagnetic
material
3) Using a stronger ferromagnetic
material (more iron content)
Record in your notes
D. F. Goldsberry Cooper Middle School
D. F. Goldsberry Cooper Middle School
Examples of Electromagnet Uses:
a) A doorbell or an alarm
D. F. Goldsberry Cooper Middle School
D. F. Goldsberry Cooper Middle School
Examples of Electromagnet Uses:
a) A doorbell or an alarm
b) Moving junk cars
D. F. Goldsberry Cooper Middle School
D. F. Goldsberry Cooper Middle School
Examples of Electromagnet Uses:
a) A doorbell or an alarm
b) Moving junk cars
c) Recording data on your
computer
d) Reading the magnetic strip on
the back of a credit card
D. F. Goldsberry Cooper Middle School
D. F. Goldsberry Cooper Middle School
Examples of Electromagnet Uses:
a) A doorbell or an alarm
b) Moving junk cars
c) Recording data on your
computer
d) Reading the magnetic strip on
the back of a credit card
e) Electric motors
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Big Idea about
Electricity and Magnetism
Electromagnetism - interaction
between electricity and magnetism
D. F. Goldsberry Cooper Middle School
Big Idea about
Electricity and Magnetism
a. Magnetic forces arise from the
movement of electrical charge.
b. Electrical forces arise from the
movement of a magnet (induced
current)
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Motors
An electric motor is a device that
changes electrical energy into
mechanical energy.
All electric motors have an armature—a
loop or coil of wire that can rotate. The
armature is mounted between the poles
of a permanent magnet or electromagnet.
D. F. Goldsberry Cooper Middle School
D. F. Goldsberry Cooper Middle School
Generators
A generator is a device that uses
electromagnetic induction to change
mechanical energy into electrical
energy.
An electric current is made when a
magnet moves in a coil of wire or when a
wire moves between the poles of a
magnet (electromagnetic induction).
D. F. Goldsberry Cooper Middle School
D. F. Goldsberry Cooper Middle School
D. F. Goldsberry Cooper Middle School
Task #1 – Index Card (Front) 1. Why are some substances magnetic?
2. What happens if you cut a magnet in half?
3. Name three uses of magnets in everyday life.
Task #2 – Index Card (Back)
Answer questions for three mini-labs.
Task #3 – Review Quiz Questions
Task #4 – Complete Practice Sheet #23