WorksheetsForces Review PS3.1 & 3.2
Total questions: 28
Worksheet time: 14mins
Which electric motor will turn the coil the fastest?
Which force diagram best represents an object that is moving to the right?
Which arrangement of a magnetic toy car and a magnet shows the largest force between the objects?
A student tests a model generator by using a voltmeter to measure electricity production. The student changes the size of the copper coil and the strength of the magnet in the generator. Which design will allow the generator to produce the most electricity?
Which next step will allow the student to test a variable that changes the speed of the motor's rotation?
Reverse the magnets, and repeat steps 1-5.
Replace the 1 V battery with a 3 V battery and repeat steps 1-5.
Wind the wire in the opposite direction and repeat steps 1-5.
Increase the distance of the motor from the ground and repeat steps 1-5.
A group of students conduct an experiment, where they build a tower using drinking straws and add metal weights to the tower until the tower breaks. The students need to explain why the metal weights cause the tower to break. Which statement best describes the force that causes the metal weights to break the tower?
The force is gravity and is a noncontact force between the weights and Earth.
The force is gravity and is a contact force between the weights and the tower.
The force is magnetic and is a noncontact force between the weights and Earth.
The force is magnetic and is a contact force between the weights and the tower.
How does the train stay elevated above the tracts?
the force of attraction between the electromagnets
the force of repulsion between the electromagnets
the pull of gravity on the train
the push of gravity on the train
How does the student's device model a generator?
When the coil is held still between the magnetic poles, a current is produced in the coil to power the light bulb.
When the coil moves between the magnetic poles, a current is produced in the coil to power the light bulb.
When the coil rotates between the magnetic poles, it creates a magnetic field to produce electric current to power the light bulb.
When the coil is placed between the magnetic poles, the magnets behave like a battery to power the light bulb.
Which type of noncontact force involves the movement of energy through a circuit?
electrical
gravitational
magnetic
static
A magnet is attached to the negative terminal of a battery, and a wire connects the positive battery terminal to the magnet, as shown.
The wire spins around the battery. What type of device is created by this design?
generator
motor
spectroscope
transformer
A student creates four models to show the forces between charged particles.
Which question is the student trying to answer with the models?
How does distance affect the magnetic force?
How do distance and charge affect the magnetic force?
How does charge affect the electric force?
How do charge and direction affect the electric force?
A student slides two magnets onto a stick. One magnet sits at the bottom, and the student holds the other at the top. Next, the student releases the magnet at the top and observes that it does not touch the other magnet, as shown.
Which explanation describes the forces acting on the top magnet after it is released?
The gravitational and magnetic forces both repel the magnet.
The gravitational and magnetic forces both attract the magnet.
A gravitational force repels the magnet, but a magnetic force attracts the magnet.
A gravitational force attracts the magnet, but a magnetic force repels the magnet.
A generator converts mechanical energy to electrical energy by using a conducting metal loop turning in a
magnetic field.
gravitational field.
steel sphere.
copper sphere.
Which of the following will always produce a magnetic force on a nearby iron nail?
a long piece of copper wire
a large static electric charge
an electric current
an electric field
Marty rubbed a balloon on his shirt. The balloon was then able to stick to the wall of the room. Which picture best represents the charges of the particles on the balloon and the wall that cause the balloon to be attracted to the wall?
One student rubs a balloon against his hair several times. Another student passes a comb through her hair several times. The students place the comb near the balloon and observe that the comb repels the balloon. Which is the most likely reason the comb is able to repel the balloon?
The balloon has a positive charge and the comb is neutral.
The balloon and the comb have the same electrical charge.
The balloon has a negative charge and the comb is neutral.
The balloon and the comb have opposite electrical charges.
When Mandy took clothes out of a dryer, she observed that a sock was clinging to a shirt. Which situation could cause the sock to be attracted to the shirt?
Both the sock and shirt have large positive charges.
Both the sock and shirt have small negative charges.
The sock has a small positive charge but the shirt has a small negative charge.
The sock has a small positive charge while the shirt has a large positive charge.
Students made an electromagnet by wrapping a copper wire around a steel rod and then attaching the ends of the wire to a battery. Using different configurations, they counted the number of paper clips that the electromagnet picked up. They obtained the data shown in the table.
Which conclusion is supported by the data?
The strength of the magnet depends mostly on the length of the wire.
The strength of the magnet depends mostly on the number of batteries.
The more coils, the more electricity the electromagnet produces.
The strength of the magnet depends mostly on the number of coils.
Would increasing the number of batteries in a circuit that is connected to a small electric motor affect the speed of the motor, if all other variables are kept constant?
No, because it is the magnetic force, not the electric force, that controls the motor speed.
Yes, the motor would run faster because the increased electrical force increases the magnetic force in the motor.
No, the speed of a motor is controlled only by the number of wire coils in the motor.
Yes, the motor would run faster because increased current causes the motor to become warmer.
Would increasing the number of batteries in a circuit that is connected to a small electric motor affect the speed of the motor, if all other variables are kept constant?
No, because it is the magnetic force, not the electric force, that controls the motor speed.
Yes, the motor would run faster because the increased electrical force increases the magnetic force in the motor.
No, the speed of a motor is controlled only by the number of wire coils in the motor.
Yes, the motor would run faster because increased current causes the motor to become warmer.
Which change would increase the magnetic force between these magnets?
moving the magnets closer together
placing a piece of glass between the magnets
moving the magnets farther apart
placing a sheet of steel between the magnets
Jenna has a cupboard with a door held shut by a magnet on the doorframe and a steel plate on the door. Jenna’s cat can open the door. How can Jenna increase the strength of the magnetic force holding the door so that her cat cannot open it?
Replace the steel plate with a copper plate so a stronger force forms.
Add a second steel plate to the door so that both plates touch the magnet.
Add a second magnet to the door frame so that both magnets touch the steel plate.
Reverse the direction of the magnet so that the opposite pole touches the plate.
A student wrapped a wire around an iron nail and connected the wire to a battery. The nail became magnetized, as shown in Diagram 1. When the battery was disconnected, the nail was no longer magnetized, as shown in Diagram 2.
Which statement best describes what occurred during this investigation?
A new property was acquired when the nail became magnetized and caused a chemical change in the nail.
When the nail became magnetized the iron atoms in the nail were temporarily aligned and caused a physical change.
The electric current passing through the wires heated the nail and caused the nail to undergo a chemical change.
The electric current passing through nail temporarily changed the iron atoms into another substance and caused a physical change.
A student wants to study the magnetic forces between three magnets. The student sets up an experiment by hanging three magnets next to each other. Which position will the magnets most likely take once the student places the magnets on the strings?
The magnet on the right is moved toward the suspended magnet on the left.
Which statement describes the interactions of the magnets in terms of their magnetic fields?
A repulsive force between the two magnets causes the suspended magnet to swing to the left.
A repulsive force between the two magnets causes the suspended magnet to oscillate like a pendulum.
An attractive force between the two magnets causes the suspended magnet to swing to the right.
An attractive force between the two magnets cause the suspended magnet to oscillate like a pendulum.
Which device transforms mechanical energy into alternating current electrical energy?
battery
motor
transformer
generator
The Hoover Dam produces about 4.2 billion kilowatt-hours of energy each year, using flowing water to rotate fan-like blades in turbine generators. Which of the following summarizes the production of energy at Hoover Dam?
Mechanical energy of the flowing water is transformed into electrical energy by rotating coils in a magnetic field, producing an alternating current.
Mechanical energy of the flowing water is transformed into thermal energy by rotating coils in a magnetic field, producing a direct current.
Thermal energy of the flowing water is transformed into electrical energy by rotating coils in a magnetic field, producing an alternating current.
Thermal energy of the flowing water is transformed into mechanical energy by rotating coils in a magnetic field, producing a direct current.
