WorksheetsUnit 2-Forces in Nature
Total questions: 38
Worksheet time: 23mins
Items that use electricity often have the wires covered in plastic. This is because plastic _____.
can be bent into any shape.
is a poor conductor of electricity.
can absorb heat well.
is a cheap way to cover exposed wire.
The figure shows a negatively charged sphere and a balloon that has been rubbed with a cloth. If the two are brought close to each other but do not touch each other, you can predict that the objects will ___.
repel each other.
attract each other.
charge each other.
polarize each other.
Which electromagnet would have the most strength?
The one with 50 coils.
The one with 100 coils.
The one with 200 coils.
The one with 150 coils.
Which of the following would increase the strength of an electromagnet?
A smaller battery.
Fewer coils around the iron core.
larger diameter iron core.
smaller diameter wire.
What is the force that causes all objects to fall to Earth?
friction
gravity
magnetism
air resistance
If you have pairs of magnets of different sizes, which ones would attract each other from the farthest distance?
the largest pair
the smallest pair
all magnets have the same attractive force
the pair that is not covered in plastic
What is the arrangement of the poles in A, B, and C in order for the 3 rings to repel each other?
north, south, north
north, south, south
south , south, north
south, north, south
Which of the following best explains this phenomena?
The magnets are attracting each other even though they are not touching.
The magnets have opposite ends facing each other creating a magnetic field.
The magnets are repelling each other even though they are not touching.
The magnets have the same ends facing each other creating a gravitational field.
What can be concluded from this information?
Increasing the number of turns of wire increase electromagnetic strength.
Increasing the number of turns of wire has no effect on electromagnetic strength.
Increasing the number of turns of wire decreases electromagnetic strength.
Increasing voltage increases electromagnetic strength.
This is a strong, short-lived magnet created by looping current carrying wire around and iron core.
generator
motor
magnetism
electromagnet
A force of attraction or repulsion due to the arrangement of electrons.
magnetism
electromagnetic wave
electrical charge
electricity
A machine that can convert mechanical energy into electrical energy
generator
motor
electricity
magnetism
During a storm, wind causes clouds to rub together transferring electrons to lower clouds by friction. The negative charge on the bottom of the clouds becomes so large that a positive charge forms on the ground surface. There is a massive discharge of electrons from the clouds to the ground causing a lightning bolt. How did the charges get from the cloud to the ground?
Negative charges move from the cloud to the ground through conduction.
Negative charges move from the cloud to the ground through induction.
Positive charges move from the cloud to the ground through insulation.
Positive charges move from the cloud to the ground through friction.
A machine that can convert electrical energy into mechanical energy.
electric motor
electric generator
How would you increase the gravitational force between two bodies?
increase the masses of the bodies and increase the distance between them
increase the masses of the bodies and decrease the distance between them
decrease the masses of the bodies and increase the distance between them
decrease the masses of the bodies and decrease the distance between them
Choose ALL that apply:
Which of the following would cause an increase in the electric or magnetic force?
Increase the amount of charge on each object
Decrease the distance between the objects
Decrease the charge on one of the objects
Increase the distance between the objects
Increase the mass of the objects
The diagram shows the electric field lines around the two spherical charges (gold circles), what are the signs of the left and right charge respectively?
negative, negative
negative, positive
positive, positive
positive, negative
The positively charged glass rod has induced a charge on the once neutral metal spheres. Which numbered picture would represent the final distribution of charges in the spheres?
1
2
3
4
Which direction do the magnetic field lines run in this bar magnet?
south to north
north to south
Which of the following is the only subatomic particle that can be gained or lost by an atom and is used in electricity?
a
b
c
I have no idea!
The iron filings around the magnet in this picture are arranged this way showing the _____ produced by the magnet.
vibration
force field
magnetic field
magnetic impulse
Which is NOT a method to demagnetize a magnet?
cooling the magnet
heating the magnet
dropping or hitting the magnet too many times
putting a magnet in a strong magnetic field that is opposite of its own
A child is jumping on a trampoline. No matter how high he jumps he will always land because _____.
inertia pulls him down.
the force of gravity pulls him down.
a magnetic force pulls him down.
air resistance pushes him down.
A ripe acorn falls from an oak tree. What force causes it to fall to the ground?
air resistance
friction
gravity
magnetism
Which colored spheres represents the particle used in the accumulation of charge either through friction, induction or conduction?
the gray spheres
the red spheres
the blue spheres
Which material is a conductor?
glass
plastic
rubber
graphite
What is the biggest static discharge in the world?
(a)
Objects become charged when they gain or lose (a) .
Which material is a conductor?
air
glass
copper
styrofoam
Which material is an insulator?
plastic
aluminum foil
paper clips
iron pot
Choose all the items that are conductors.
aluminum
iron
glass
graphite
cobalt
Which metals can be magnetized?
nickel
aluminum
copper
cobalt
iron
Choose all the materials that are insulators.
styrofoam
wood
paper
paper clip
plastic
What determines the strength of a magnet? Choose all that apply.
The number of magnetic field lines.
The direction the magnetic field lines run.
How close the magnetic field lines are to each other.
The length and width of the magnet.
What items do an electric motor and an electric generator share? Choose all that apply.
iron core
permanent magnet
wire coils
a battery source
A number of devices use electromagnets. Some devices require strong magnetic fields. You investigate how to increase the strength of a basic electromagnet. How can you test whether the magnetic field produced by an electromagnet is increasing in strength?
A stronger magnet will require less wire for the coils.
A stronger magnet will have more widely spaced coils.
A stronger magnet will have a reduced measureable current.
A stronger magnet will attract a greater number of metallic items.
What would need to be done in order to increase the strength of the motor?
Reduce the size of the axle running through the center of the motor.
Increase the number of coils of wire within the two sections of the motor.
Decrease the voltage of the power source being used to operate the motor.
Place the permanent magnets & coils of wire farther apart inside the motor.
What 2 changes should be made to BEST investigate the strength of the force between the paper clip and the magnet?
Move the magnet farther away from the paper clip.
Replace the spring scale with a larger one.
Replace the bar magnet with a horseshoe magnet.
Increase the length of the string attaching the spring scale to the wall.
Increase the length of the string attaching the spring scale to the paper clip.
