Vocabulary:

call

earth

each 

other

increase

strong

approach

iron

steel

become

touch

pull

over

bar magnet

full

little

aligned

show


Phrases:

Magnets have two magnetic poles, called south pole (S) and north pole (N), referring to the magnetic poles of the earth.

Equal poles repel each other. Opposite poles attract each other. The magnetic force increases strongly approaching one pole to the other.

Ferromagnetic materials, such as iron or steel, can become magnetized touching them with the pole of a magnet and then pulling the magnet over them. 

It is possible to explain the magnetism of a bar magnet imagining that it is full of little elementary magnets. If the elementary magnets are aligned, a magnetic effect is observable, if they aren't, the metal bar shows no magnetic effect.

The magnetic field is represented with lines. Along the field lines the magnetic force acts. The magnetic field lines point from the north to the south pole.