Between two magnets, is the attraction stronger, is the repulsion stronger, or

are the two forces the same? •attract

•repel

•polarity

•strength

An electromagnet becomes a magnet when an electric current passes through an insulated wire that is wrapped around an iron core (nail).

These are the properties of an electromagnet:Polarity

Attraction

Repulsion

Strength

Polarity• Magnets and electromagnets have areas on their ends, or tops and bottoms, that are called poles.

• The magnetic pull or attraction is strongest at the poles.

• Every magnet has a North pole and a South pole.

PolarityThe poles of magnets affect each other in the following ways:

Like poles repel each other.

Unlike poles attract each other = opposites attract

AttractionMagnets and electromagnets attract or tend to move toward each other (unlike poles) and certain types of metals (mainly iron or steel). When iron nails or steel paper clips are held near a magnet, they will move toward or be attracted to the magnet.

Repulsion

Magnets and electromagnets can repel or move away from each other if their like poles (North-North or South-South) are brought near each other.

StrengthThe attractive strength of a magnet or electromagnet is greatest at its poles.

Some magnets have a greater attraction for magnetic materials than others.

The strength of the magnetic attraction of a magnet or electromagnet can be measured by counting the number of objects, for example paper clips that a magnet can pick up.

Let’s read about the properties of

magnets!

Tune: The More We Get Together!Did you ever see a magnet, a magnet, a

magnet?Did you ever see a magnet pull this way and

that?

On iron and steel, its pull is unreal!Did you ever see a magnet pull this way and

that?

Did you ever see a magnet, a magnet, a magnet?

Did you ever see a magnet pull this way and that?

A magnet has action, it's called an attraction!Did you ever see a magnet pull this way and

that?

Did you ever see a magnet, a magnet, a magnet?

Did you ever see a magnet pull this way and that?

Meisha Goldish

Magnetic Tug of War

Between two magnets, is the attraction stronger, is the repulsion stronger, or are the two forces the same? I predict ___________________________________________________________________

PULL Distance apart when A

moves

PUSH Distance apart when A

moves

Trial 1 Trial 1

Trial 2 Trial 2

Trial 3 Trial 3

#s in order #s in order

Median cm. Median cm.

PULL Distance apart when A

moves

PUSH Distance apart when A

moves

Trial 1 Trial 1

Trial 2 Trial 2

Trial 3 Trial 3

#s in order #s in order

Median cm. Median cm.

Now I think ___________________________________________.

__________________

Dear __________________Today we learned more about the properties of magnets and

electromagnets. Magnets have something called polarity. When like poles face each other, the magnets ___________________. When unlike poles face each other, the magnets___________________. Look at my diagram below to understand what happens:

Did you know not all ______________ is attracted to a magnet. For example, a penny does not stick to a magnet. Objects containing ___________ or ____________ are attracted to a magnet. A few examples of these objects include _____________, ______________ and ________________.A magnet is strongest at its _______________. Some magnets are stronger than others. Strength can be measured by the number of ______________ a magnet will pick up.

Today I learned _______________________________________________________________________________________________________________________________________________________________________

___________,

Like Poles Unlike Poles