Quiz about Forces Review PS3.1 & 3.2

Question 1

Which electric motor will turn the coil the fastest?

Accepted Answer

Question 2

Which force diagram best represents an object that is moving to the right?

Accepted Answer

Question 3

Question 3.

Accepted Answer

Question 4

Which arrangement of a magnetic toy car and a magnet shows the largest force between the objects?

Accepted Answer

Question 5

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?

Accepted Answer

Question 6

Which next step will allow the student to test a variable that changes the speed of the motor's rotation?

Accepted Answer

Replace the 1 V battery with a 3 V battery and repeat steps 1-5.

Answer

Reverse the magnets, and repeat steps 1-5.

Answer

Wind the wire in the opposite direction and repeat steps 1-5.

Answer

Increase the distance of the motor from the ground and repeat steps 1-5.

Question 7

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?

Accepted Answer

The force is gravity and is a noncontact force between the weights and Earth.

Answer

The force is gravity and is a contact force between the weights and the tower.

Answer

The force is magnetic and is a noncontact force between the weights and Earth.

Answer

The force is magnetic and is a contact force between the weights and the tower.

Question 8

How does the train stay elevated above the tracts?

Accepted Answer

the force of repulsion between the electromagnets

Answer

the force of attraction between the electromagnets

Answer

the pull of gravity on the train

Answer

the push of gravity on the train

Question 9

How does the student's device model a generator?

Accepted Answer

When the coil moves between the magnetic poles, a current is produced in the coil to power the light bulb.

Answer

When the coil is held still between the magnetic poles, a current is produced in the coil to power the light bulb.

Answer

When the coil rotates between the magnetic poles, it creates a magnetic field to produce electric current to power the light bulb.

Answer

When the coil is placed between the magnetic poles, the magnets behave like a battery to power the light bulb.

Question 10

Which type of noncontact force involves the movement of energy through a circuit?

Accepted Answer

electrical

Answer

gravitational

Answer

magnetic

Answer

static

Question 11

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?

Accepted Answer

motor

Answer

generator

Answer

spectroscope

Answer

transformer

Question 12

A student creates four models to show the forces between charged particles.

Which question is the student trying to answer with the models?

Accepted Answer

How do distance and charge affect the magnetic force?

Answer

How does distance affect the magnetic force?

Answer

How does charge affect the electric force?

Answer

How do charge and direction affect the electric force?

Question 13

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?

Accepted Answer

A gravitational force attracts the magnet, but a magnetic force repels the magnet.

Answer

The gravitational and magnetic forces both repel the magnet.

Answer

The gravitational and magnetic forces both attract the magnet.

Answer

A gravitational force repels the magnet, but a magnetic force attracts the magnet.

Question 14

A generator converts mechanical energy to electrical energy by using a conducting metal loop turning in a

Accepted Answer

magnetic field.

Answer

gravitational field.

Answer

steel sphere.

Answer

copper sphere.

Question 15

Which of the following will always produce a magnetic force on a nearby iron nail?

Accepted Answer

an electric current

Answer

a long piece of copper wire

Answer

a large static electric charge

Answer

an electric field

Question 16

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?

Accepted Answer

Question 17

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?

Accepted Answer

The balloon and the comb have the same electrical charge.

Answer

The balloon has a positive charge and the comb is neutral.

Answer

The balloon has a negative charge and the comb is neutral.

Answer

The balloon and the comb have opposite electrical charges.

Question 18

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?

Accepted Answer

The sock has a small positive charge but the shirt has a small negative charge.

Answer

Both the sock and shirt have large positive charges.

Answer

Both the sock and shirt have small negative charges.

Answer

The sock has a small positive charge while the shirt has a large positive charge.

Question 19

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?

Accepted Answer

The strength of the magnet depends mostly on the number of coils.

Answer

The strength of the magnet depends mostly on the length of the wire.

Answer

The strength of the magnet depends mostly on the number of batteries.

Answer

The more coils, the more electricity the electromagnet produces.

Question 20

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?

Accepted Answer

Yes, the motor would run faster because the increased electrical force increases the magnetic force in the motor.

Answer

No, because it is the magnetic force, not the electric force, that controls the motor speed.

Answer

No, the speed of a motor is controlled only by the number of wire coils in the motor.

Answer

Yes, the motor would run faster because increased current causes the motor to become warmer.

Question 21

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?

Accepted Answer

Yes, the motor would run faster because the increased electrical force increases the magnetic force in the motor.

Answer

No, because it is the magnetic force, not the electric force, that controls the motor speed.

Answer

No, the speed of a motor is controlled only by the number of wire coils in the motor.

Answer

Yes, the motor would run faster because increased current causes the motor to become warmer.

Question 22

Which change would increase the magnetic force between these magnets?

Accepted Answer

moving the magnets closer together

Answer

placing a piece of glass between the magnets

Answer

moving the magnets farther apart

Answer

placing a sheet of steel between the magnets

Question 23

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?

Accepted Answer

When the nail became magnetized the iron atoms in the nail were temporarily aligned and caused a physical change.

Answer

A new property was acquired when the nail became magnetized and caused a chemical change in the nail.

Answer

The electric current passing through the wires heated the nail and caused the nail to undergo a chemical change.

Answer

The electric current passing through nail temporarily changed the iron atoms into another substance and caused a physical change.

Question 24

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?

Accepted Answer

Question 25

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?

Accepted Answer

An attractive force between the two magnets causes the suspended magnet to swing to the right.

Answer

A repulsive force between the two magnets causes the suspended magnet to swing to the left.

Answer

A repulsive force between the two magnets causes the suspended magnet to oscillate like a pendulum.

Answer

An attractive force between the two magnets cause the suspended magnet to oscillate like a pendulum.

Question 26

Which device transforms mechanical energy into alternating current electrical energy?

Accepted Answer

generator

Answer

battery

Answer

motor

Answer

transformer

Question 27

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?

Accepted Answer

Mechanical energy of the flowing water is transformed into electrical energy by rotating coils in a magnetic field, producing an alternating current.

Answer

Mechanical energy of the flowing water is transformed into thermal energy by rotating coils in a magnetic field, producing a direct current.

Answer

Thermal energy of the flowing water is transformed into electrical energy by rotating coils in a magnetic field, producing an alternating current.

Answer

Thermal energy of the flowing water is transformed into mechanical energy by rotating coils in a magnetic field, producing a direct current.

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