Magnetic Fields Study Guide

What happens when two like magnetic poles are brought together?

They repel each other because two north poles or two south poles push away from each other.

What happens when two opposite magnetic poles are brought together?

They attract each other because a north pole and a south pole pull toward each other.

What is a magnetic field?

The region around a magnet where magnetic forces can act on other magnets or magnetic materials.

Can a magnet exert a force on another magnet without touching it?

Yes. Magnets can exert forces at a distance through their magnetic fields without physically touching.

What is the difference between attracting and repelling?

Attracting means pulling objects toward each other while repelling means pushing objects away from each other.

What are magnetic field lines?

Lines used to represent the pattern and direction of a magnetic field around a magnet.

What do magnetic field lines show?

They show the direction and pattern of magnetic forces around a magnet.

How do magnetic field line patterns differ between attracting and repelling magnets?

Attracting magnets have field lines that connect between opposite poles while repelling magnets have field lines that bend away from each other.

What is a magnetic pole?

One of the two ends of a magnet where its magnetic force is strongest. The two poles are called north and south.

What is potential energy?

Stored energy that has the ability to cause motion or other changes.

What is kinetic energy?

The energy an object has because of its motion.

What happens to potential energy when magnets are pushed against a magnetic force?

Energy is transferred into the magnetic field and stored as magnetic potential energy.

What happens when a magnet is released after being pushed against a repelling magnetic force?

The magnets repel and move apart as stored magnetic potential energy is converted into kinetic energy.

What is the difference between potential energy and kinetic energy?

Potential energy is stored energy while kinetic energy is the energy an object has because it is moving.

What does it mean to convert energy?

To change energy from one form into another

What does it mean to transfer energy?

To move energy from one object or system to another.

Where does the energy to launch the model spacecraft come from?

It comes from potential energy stored in the magnetic field of the launcher system

What happens to magnetic force as two magnets get closer together?

The magnetic force generally becomes stronger as the distance between the magnets decreases.

Why does moving a magnet against a stronger magnetic force transfer more energy into the magnetic field?

Because more work must be done to move the magnet against a stronger force

What happens to the magnetic potential energy when two like poles are pushed closer together?

The potential energy increases because energy is transferred into the magnetic field as the magnets are pushed against their repelling force.

What happens when you try to pull two attracting magnets apart?

You must work against the attractive magnetic force

Why does it take more effort to move a magnet against a stronger magnetic force?

Because the stronger force resists the movement more

How can magnetic potential energy turn into kinetic energy?

When magnets are released

What happens when two north poles are pushed together and then released?

They repel each other and move apart because like poles repel

When two magnets with opposite poles facing each other are pushed closer together

is the student pushing with or against the magnetic force?

How can a model spacecraft move without the launcher physically touching it?

The launcher's magnetic field exerts a force on the spacecraft

Why might a spacecraft launch faster on Wednesday than Tuesday?

The Wednesday launcher may have stored more magnetic potential energy

Which launcher could launch the same spacecraft faster: one with more or less magnetic potential energy?

The launcher with more magnetic potential energy could launch the spacecraft faster because more energy can be converted into kinetic energy.

Why does moving a magnet against a stronger magnetic force store more potential energy?

More work and energy are required to move the magnet against the stronger force

A student claims magnets only exert forces when they touch. Is this correct?

No. Magnets can exert forces at a distance through their magnetic fields without physically touching.

A student claims moving a magnet against a magnetic force does not transfer energy. Why is this incorrect?

Moving a magnet against a magnetic force requires work

What does attract mean in magnetism?

To pull objects toward each other because of an attractive magnetic force.

What does repel mean in magnetism?

To push objects away from each other because of a repulsive magnetic force.

What is a magnetic field line?

A line that represents the pattern and direction of a magnetic field around a magnet.

What does convert mean when discussing energy?

To change energy from one form into another.

What does refute mean?

To prove that a claim or statement is incorrect using evidence and reasoning.

How does energy change when two like magnetic poles are pushed together and released?

Pushing the magnets together transfers energy into the magnetic field as potential energy. When released

Why might two spacecraft launchers with magnets in different positions produce different spacecraft speeds?

Different magnet positions can create different magnetic forces and amounts of stored magnetic potential energy

What happens to magnetic force when magnets are moved farther apart?

The magnetic force generally becomes weaker as the distance between the magnets increases.

What happens to magnetic potential energy when magnets are moved farther apart?

It depends on whether the magnets are attracting or repelling. Moving like poles apart generally decreases their potential energy

A student says the closer magnets are

the weaker their magnetic force becomes. Why is this incorrect?

How can magnetic field line patterns help determine whether two magnets are attracting or repelling?

Field lines connecting between opposite poles indicate attraction while field lines bending away from each other indicate repulsion.

How does the position of magnets affect the potential energy stored in a magnetic field?

Changing the distance and position of magnets changes the magnetic potential energy because work is required to move them against magnetic forces.

Why is it important to consider the entire system when explaining where spacecraft launch energy comes from?

Because energy is transferred and stored within the launcher system and then converted into the spacecraft's kinetic energy during launch.

How can magnetic force and magnetic potential energy explain why a spacecraft launched faster on Wednesday than Tuesday?

The Wednesday launcher may have had magnets positioned to create a stronger repelling force and store more magnetic potential energy. When released