Magnets – lesson 3

TargetTo understand more about magnetic fields.

Saturday 8 April 2023

Homework answers

The Pole Star- This star is situated

exactly above the north pole. When the Earth spins on its axis the star does not appear to move in the sky- see picture.

Homework answers

The Southern Cross. This is a prominent star

formation, it can only be seen from the southern hemisphere.

A line drawn through the pointers to the horizon will indicate due south.

Homework answers

The Southern Cross. This star formation is also

part of the Australian flag. One of the pointers (alpha

centauri) is the 3rd brightest star in the sky and is the closest star to Earth (4.37 light years away).

It is actually a double star.

Homework answers

True north- This is the point on

top of the Earth’s axis. The Earth spins around this point.

Also called the geographic north pole.

Homework answers

Magnetic north- This is the point near

the actual north pole to which a compass will point.

This point varies as time passes.

Inducing magnetic fields• If a magnet is placed

near a piece of iron it will induce a magnetic field into the iron.

• The iron becomes a temporary magnet, with a north and south pole.

• If steel is used it may become a permanent magnet.

Iron bar

New temporary magnet

Before

After

Repulsion test

Repulsion is the only real test to see if something is a magnet because a magnet will attract – another magnet and/or an unmagnetised piece of iron or nickel.

Homework – Hodder B – page 65 Answer all the questions and box.

Quiz results

Name Magnets quiz 1Black Devil 6Crazy Cop Guy 9Cute Cat 9Flying Horse 5Kong Fu Skunk 8Man 2Merc 1 10Miley Cyrus 7Monkey Boy 8Purple Antelope 8Teletubbies 6Timothy Summer Surprise 7