WorksheetsElectromagnetism and Gravitational Attraction Review
Total questions: 107
Worksheet time: 1hrs 14mins
An object that is magnetic without human influence is?
magnetic field
natural magnet
permanent magnet
magnetic pole
The area where a magnetic force acts is a?
magnetic field
permanent magnet
electromagnet
natural magnet
Something that is always magnetic is a?
magnetic pole
magnetic field
natural magnet
permanent magnet
A magnet that can be turned on and off with an electric current is an?
electromagnet
natural magnet
magnetic field
magnetic pole
The point on a magnet where magnetic force is the strongest is the?
magnetic field
natural magnet
electromagnet
magnetic pole
If a magnet has a south end and a north end together will they attract or repel?
attract
repel
If a magnet has a south end and a south end together, will it attract or repel?
attract
repel
If a magnet has a north end and a south end together, will it attract or repel?
attract
repel
Only a few magnets have ends called poles.
FALSE, they all have ends called poles.
TRUE
There is a north and a south pole on every magnet.
TRUE
FALSE, there is not a north and south pole on every magnet.
You can see a magnetic field with your own eyes.
TRUE
FALSE, they are invisible to the human eye.
If a magnet is cut into a smaller magnet, you will get two smaller magnets. Each one of those new magnets has its own north and south pole.
TRUE
FALSE, the new magnets will have two north poles.
Choose 2 items that would be magnetic.
refrigerator
treehouse
water bottle
velcro
swing set
The diagram shows the magnetic field surrounding a bar magnet. The closer together the lines of force, the stronger the magnetic field. According to the diagram, where is the magnetic field the strongest.
north pole
south pole
both poles
in the middle
Alexandra was preparing to go on a hike in the woods. She gathered the equipment she would need and placed it on the kitchen counter. By chance, she placed her compass near an electrical outlet. Although the compass was not moving, the compass needle turned toward the outlet because....
the electric current in the outlet produced a magnetic field
the compass only works properly outside
the kitchen counter was made of a ferrometal
the kitchen has a microwave
Which pair of magnets would result from cutting the magnet in half?
According to the diagram, which pair could both be north poles?
A and B
B and C
A and C
C and D
The picture shows an experiment used to determine the effect of using more nails in the core of an electromagnet. Which of the following would make this a better-designed experiment?
Using a different number of batteries for each electromagnet
Using the same number of turns of wire for each electromagnet
Inserting an ammeter in each circuit between the battery and the nails
Using a different size battery for each electromagnet
A magnet will not attract all metal objects. Which object below will a magnet not attract?
Nail
Foil
Battery
compass needle
Harry wanted to find out how to make an electromagnet stronger. The results of his experiment are listed in the table above. According to his data, which of the following foes not make an electromagnet stronger?
increasing the number of batteries that are connected
increasing the number of wire turns around the core
increasing the number of mails inside the core
increasing the number of tacks used
Scientists believe that magnetism is caused by the spin of certain atomic particles called....
electrons
protons
neutrons
magnetrons
Looking at the diagram of a simple electric motor, what would be a way to increase the speed of the fan.
decrease the coil size
decrease the size of the permanent magnet
increase the fan size
increase the battery size
Which is best represented by the diagram?
aluminum foil
nail in contact with a magnet
normal iron nail
glass
A student performed an experiment to determine the number of paper clips that are attracted to an electromagnet as the amount of current changes. The data collected is displayed in the table.
Which graph best describes the relationship between magnetism and electrical current?
A material through which electrons do NOT flow easily is a(n) ______.
insulator
conductor
fuse
circuit breaker
Which of the following statements about electric charge is true?
Objects must be touching on another to exert electrical force.
Electrical forces act at a distance.
Air cannot conduct electricity; it is conducted only by solid materials.
Opposite electric charges always repel one another.
Which two areas of physical science are closely related to the development of electric motors and generators?
sound and light
electricity and sound
light and magnetism
electricity and magnetism
Which of the following will decrease the strength of the magnetic field around a wire?
increasing the current flowing through the wire
using less loops around the iron core
flipping the direction of the current flowing through the wire
using a larger iron core
The function of a generator is to change ______
chemical energy to electrical energy
electrical energy to chemical energy
mechanical energy to electrical energy
electrical energy to mechanical energy
This exerts a force that causes other electric charges to move.
electrical poles
electrical fields
insulators
conductors
Alexandra was preparing to go on a hike in the woods. She gathered the equipment she would need and placed it on the kitchen counter. By chance, she placed her compass near an electrical outlet. Although the compass was not moving, the compass needle turned because ______.
the electric current in the outlet produced a magnetic field
the compass could only be used outdoors
the kitchen counter was made of a magnetic substance
the kitchen had a microwave oven
What happens when you split a magnet in half?
It becomes twice as strong
You end up with two smaller magnets
You end up with a North Pole magnet and a South Pole Magnet (as long as you split it perfectly in half)
Your magnet loses all of it's magnetism (it leaks out of the break)
Why does a compass align itself with Earth's North Pole?
Because compass needles are slightly magnetized and align themselves with earth's magnetic field
Because one of the poles of the magnet is called the North Pole, so it would only make sense that it would be on the North side
They don't actually do this, they just align themselves with the North side of a map
Because North is slightly downhill (as long as you are in the Northern Hemisphere) so gravity causes the compass to point North
What happens when an object with random magnetic domains is placed into a strong magnetic field?
It is attracted to the magnetic field
It aligns with the field and shoots off like superman
It aligns with the field and usually becomes a temporary magnet itself
Its domains start moving faster and it gets warmer
What happens magnetically when electricity runs through a wire (or any charged particle moves).
Nothing, magnetism and electricity are separate phenomenon
The magnetic field matches that of the Earth
It generates a magnetic field around the wire
It uses magnetism to move the charge through the wire
How can I make a permanent magnet no longer magnetic? (Select all that apply)
Hit/Drop it repeatedly
Put it near a tv or cell phone
Submerge it in water for several hours
Put it next to another magnet long term
Heat it up
This is when the magnetic domains within a piece of metal (like a nail) are oriented by an electrical current, making a very strong temporary magnet. (Vocab)
Magnetic Pole
Dipole
Electromagnet
Electric Motor
Magnetic Domain
When there is a permanent magnet, these are the atoms with partial magnetism that are all arranged along the same direction. (Vocab)
Magnetic Pole
Dipole
Electromagnet
Electric Motor
Magnetic Domain
What are the components of the electromagnets?
battery, wire and bulb
battery , copper wire and paper clips
battery, copper wire and iron nail
battery, wire and aluminum
What would happen if you took one end of the wire off the battery?
The nail will be a magnet.
The nail would no longer be a magnet
Nothing will happened.
The nail will heats up.
Which part of the electromagnets turned into a magnet when electricity flows through a coiled wire?
Battery
Copper wire
Iron Nail
Bulb
Electric currents produce _____________
electron clouds
magnetic fields
sound waves
How can the strength of an electromagnet be decreased? (mark all that apply)
increase the current flowing through the coil
increase the number of coils
reduce the number of coils
Decrease the size/power of the battery
Aisyah places two ring magnets A and B as shown.
If the top of magnet A is North pole, what pole is x in magnet B?
North
South
Name this magnet
Rod Magnet
Horseshoe maget
Button magnet
Ring magnet
What kind of magnet is this?
Round
Horseshoe
Bar
Ring
Choose the right name of the magnet below.
Ring magnet
U-shaped magnet
Horseshoe magnet
Button magnet
Choose the right name of the magnet below.
Cylinder magnet
Bar magnet
Horseshoe magnet
Button magnet
Electricity happens with the flow of
electrons.
water
sand
What's one example of a powerful electrical charge?
Lightning
fire
The accumulation of excess electric charge on an object is called
Static electricity
Electric discharge
Resistance
Current electricity
Mr. Anady rubbed two balloons against his wool sweater for 30 seconds each. What will happen when the balloons are brought near each other?
The balloons will repel each other.
The balloons will attract each other.
The balloons will become positively (+) charged.
The balloons will pop.
What are electric motors?
It is a device that converts mechanical energy into electrical energy to produce a turning effect.
It is a device that add electrical energy to mechanical energy to produce a turning effect.
An electric motor is a device that produce a turning effect.
It is a device that converts electrical energy into mechanical energy to produce a turning effect.
What is one way to decrease the strength of a motor?
Use thinner wire
Use more permanent magnets
Use more electrical tape
use a larger battery
Looking at the field lines in this picture, these two magnets are ________
Attracting
Repelling
Attracting and Repelling
Doing nothing
Which magnet below would provide the best example for the magnetic poles and magnetic fields of Earth?
How would you label pole 3 in the picture below?
North because it is being attracted to pole N across from it.
South because it is being attracted to pole N across from it.
North because it is being repelled from pole N across from it.
South because it is being repelled from pole S across from it.
By sprinkling iron filings in a magnetic field on a flat surface, it is possible to see the __________ of a magnetic field.
shape
distance
mass
temperature
The image above shows how iron filings respond to magnetic fields generated by two magnets with ____________ poles facing each other.
opposite
like
positive
negative
The image above shows how iron filings respond to magnetic fields generated by two magnets with ____________ poles facing each other.
like
opposite
positive
negative
A horseshoe magnet will generate a magnetic field similar in shape to that of two ________ poles brought near each other.
like
opposite
positive
negative
turn
The image above shows how iron filings respond to magnetic fields generated by two magnets with ____________ poles facing each other.
opposite
like
positive
negative
Choose 2 materials that cannot be attracted by a magnet.
iron
copper
steel
ceramic
Mr. Anady rubbed two balloons against his wool sweater for 30 seconds each. What will happen when the balloons are brought near each other?
The balloons will repel each other.
The balloons will attract each other.
The balloons will become positively (+) charged.
The balloons will pop.
Which of the following actions would increase the amount of force applied to the wheels of the toy car?
decreasing the number of loops in the electromagnet's coil
decreasing the electric current running through the electromagnet
replacing the magnet with a stronger magnet
increasing the distance between the magnet's poles and the electromagnet
The motor is used to lift metal boxes. How can the motor be changed to be able to lift a heavier box?
change the polarity of the magnet
add more loops of wire between the magnets
rotate the coil in a counter-clockwise direction
decrease the size of the magnets
What can be done to make the coil rotate faster?
change the polarity of the magnets
decrease the size of the magnets
use a plastic wire loop
add one more battery
Electric motors are devices that convert __________energy into __________ energy.
electricial; mechanical
chemical; potential
mechanical; electrical
mechanical; kinetic
Which best describes how an electric motor works?
When a fan blows on a wire, it causes it to spin, creating a force.
When a wire that carries electrical current is placed in zero gravity, the wire experiences a force
When a fan blows on a wire, it causes it to spin creating an electrical current
When a wire carrying electrical current is placed in a magnetic field, the wire experiences a force.
𝐀 𝐠𝐞𝐧𝐞𝐫𝐚𝐭𝐨𝐫 𝐜𝐨𝐧𝐯𝐞𝐫𝐭𝐬 𝐦𝐞𝐜𝐡𝐚𝐧𝐢𝐜𝐚𝐥 𝐞𝐧𝐞𝐫𝐠𝐲 𝐭𝐨 𝐞𝐥𝐞𝐜𝐭𝐫𝐢𝐜𝐚𝐥 𝐞𝐧𝐞𝐫𝐠𝐲. 𝐖𝐡𝐚𝐭 𝐜𝐨𝐮𝐥𝐝 𝐛𝐞 𝐝𝐨𝐧𝐞 𝐭𝐨 𝐦𝐚𝐤𝐞 𝐭𝐡𝐞 𝐥𝐚𝐦𝐩 𝐥𝐞𝐬𝐬 𝐛𝐫𝐢𝐠𝐡𝐭?
use a lamp that lights up with a lower current
increase the strength of the magnets
turn the coil faster
move the magnets farther from the coil
In a simple electric generator, a conducting loop of wire is placed in a magnetic field. The loop of wire is then rotated. Why is it necessary for the wire to be rotated?
Its motion through the air transforms heat into magnetism.
Its motion removes the magnetic field by using up the magnetic energy.
Its motion when it moves upward changes gravity into magnetism.
Its motion through the magnetic field creates a current in the wire.
A generator converts mechanical energy to electrical energy. What could be done to make the lamp brighter?
change the polarity of the magnets
turn the coil slower
turn the coil faster
decrease the size of the magnets
An electric current is generated in the wire loop whenever the crank turns, causing the magnet to spin.
How could the amount of electric current his generator produces be increased ?
increase the rate at which he turns the crank
replace the magnet with a weaker magnet
increase the distance between the magnet and the wire loop
replace the wire loop with an unlooped strand of wire
Many bicycles have generators that have a light that can be powered without a battery. Currently, no electric current is flowing through the circuit shown. What needs to happen to cause an electric current to flow through the circuit?
A smaller wire needs to be used.
A bigger light bulb needs to be used.
The magnet's north pole needs to point up.
The magnet needs to be in constant motion.
The force of attraction between all things that have mass
Gravity
Weight
Friction
Air Resistance
Nothing.
An image of the Earth-moon-sun system is shown. The moon remains in orbit around Earth because of the force of —
Earth’s rotation
the moon’s rotation
Earth’s gravity
the sun’s gravity
As the MASS of an object increases, its gravitational pull _________.
Stays the same
Decreases, then increases, then decreases
Decreases
Increases
The three examples pictured are of
Non-contact Forces
Contact Forces
The force between the phone and the mount is a
contact force
non-contact force
The moon has a smaller mass than the Earth. If you traveled to the moon your weight would?
Increase
Decrease
Remain the same
Change whenever you feel like it
Why do planets orbit the Sun?
The Sun is the only celestial object that has a gravitational pull.
The Sun’s chemical composition makes it attract planets.
Only celestial bodies that emit light, like the Sun, can be at the center of an orbit.
The Sun is the most massive object in our solar system, so it exerts the greatest gravitational pull.
What TWO ways can you increase gravitational attraction between two objects?
Give the objects more mass
Make the objects closer to each other
Give the objects less mass
Make the objects further to each other
