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______________ – Region of influence surrounding an object. (Think about baseball fields, battlefield, football field, etc.)
 A field model can be used to explain how 2 objects exerting (applying) forces on each other without touching.
 When a second object is placed in this region, the field exerts a force on the object and can cause the object to change motion.
______________ Field – Region where
______________ Field – Region where a
_________________ Field – Region of space
charged objects exert forces on other
magnet, electric current, or a moving
surrounding a body in which another
Definition charged objects .
charged particle in which a magnetic
body experiences a force of
force exerts force on another magnet,
gravitational attraction.
electric current, or charged particles.
Examples: Light bulbs, computers, cell
Examples: Magnets, TV, cell phones,
Examples: Gravity acting on Earth and
Examples phones, batteries, TV, etc.
solar wind, auroras, ______________, mid- pulling objects toward the ground.
ocean ridges, etc.
Charged and Uncharged Particles
Weight vs. Mass
 Have 2 distinct, ______________ ends
 ______________ – Positive charge
 ______________ is a gravitational force.
o North pole and South pole
o Field lines start from N to S.  Mass is the amount of matter a body
 ______________ – Negative charge
Properties
 2 types of magnets
contains.
 ______________ – No charge
o Permanent magnet
 Object on Earth will weigh
o ______________
______________ than on the moon.
Picture
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Attractive/
Repulsive
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______________ charges attract each
other.
Similar charges ______________ each
other.
Electric force ______________ as electric
charges increase.
Electric force ______________ (weakens)
with increasing distance.
Force
increase &
decrease

Benefit us?
The electricity that we use is transformed
from mechanical energy to electrical
energy in ______________ ______________.



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______________ poles attract each
other.
______________ poles repel each other.

Gravity is an attractive force since it
pulls objects ______________ each
other.
Magnetic force increases rapidly
with decreasing distance.
Magnetic force ______________
(weakens) rapidly with increasing
distance.
Earth’s magnetic field protects us
from ______________ ______________.
Directions – Compass!

Gravitational force ______________ with
the mass of objects.
Gravitational force ______________
(weakens) with increasing distance.

Keeps us on the ground instead of
floating everywhere!
Electric and Magnetic Fields are Related
 Magnetic fields can produce ______________ currents in conductors (copper).
 Electromagnets – ______________ magnets that lose their magnetism when the electric current is turned off.
o Magnet that runs on ______________.
o An electromagnet works as the electric current passes through the wire, small magnetic regions align with the wire’s magnetic
field.
o The strength of the electromagnet can be increased or decreased by changing the electric current passing through the wires.
o If the wire is twisted into a loop, the magnetic field is increased.
o The coil of wire spinning around a magnet can form an electric current.
o Examples: Motors, generators, blenders, speakers, hard drives, and electric toothbrushes.
Electric Motors 
Generators

Description
Electric motors turn ______________ energy into ______________ energy.
o It contains an electromagnet that rotates between the poles of a magnet.
o The coil of the electromagnet is connected to a battery or other source of electric
current.
o When an electric current flows through the wire in the electromagnet, a magnetic
field is produced in the ______________.
o The coil rotates because like poles ______________ and opposite poles ______________.
o The rotating coil can be attached to a shaft and a blade in an electric fan.
Generators work the opposite way (Turn ______________ energy into ______________
energy.)
o A coil of wire is wrapped around an iron core.
o The wire is placed inside a magnetic field, and the magnets are turned using a
turbine.
o Generators at Power Plants produce electric energy for our homes.
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