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SG3 Electricity and Magnetism
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Ted wants to use a magnet to hold the door of a playhouse closed. The door and the doorframe are both made of plastic. Ted places a magnet onto the doorframe. Will the magnetic force keep the door closed?
No, because the door is plastic, which is an insulator.
What happens during a static discharge?
Particles with an electric charge move between objects that are not touching.
How can an object be neutral if it contains many particles that have a negative charge?
The number of particles with a positive charge is equal to the number of particles with a negative charge.
What will happen when a particle with a negative electric charge is placed near a particle with a positive electric charge?
They will attract
This is an illustration of Earth's magnetic _______________, or the space where the force of a magnet acts.
Field
As opposed to permanent magnets, electromagnets attract magnetic objects only when the electric current is turned on. True or False?
True
The largest natural magnet on Earth is the planet itself. True or False?
True
The strength of electric force becomes stronger as electrically charged objects get closer to each other. True or False?
True
The strength of electric force becomes weaker as electrically charged objects get closer to each other.. True or False?
False
A lightning strike is an example of the transfer of particles that have an electric charge between objects that are not touching. This transfer is called a ____________________.
static discharge
Gold, silver, and copper allow electrical charges to move easily. These metals make efficient _______________.
conductors
Electric charges flow easily through insulators such as rubber, wool, glass, and wood. True or False?
False
The push or pull of charged objects on each other is _________.
an electric force.
True or false?
If the number of positive and negative charges are equal to each other, the matter has no electric charge. It is
neutral
A naturally magnetized mineral magnetite, called __________, was used as the first compass. It could turn an iron needle into a magnet, which would always point North. This enabled navigation.
Lodestone
____________ is a noncontact force that can either attract or repel other objects.
Magnetism
___________ is the force that acts between any two objects that pulls them toward one another.
Gravity
_____________ is a force that goes against the motion of an object.
Friction
A ________________ is a push or a pull.
force
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