year 8 physics lent term

MAGNETITE, POLES, NORTH, SOUTH, REPEL, ATTRACT, FIELD .

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​Magnet and magnetic fields

magnet, magnetite, lodestone, magnetic, non-magnetic, poles, attract, repel.

Keywords

Understand the concept of magnet

understand magnetic and non-magnetic materials

understand properties of magnet

​learning objectives

First class (introduction to magnet

The word magnet has been derived from the word "Magnetite" which in Latin means "Magnesia or Magnes". Magnes was the shepherd who discovered the natural magnet (lodestone) and magnesia was a territory

Magnet

magnetic and non magnetic materials

Materials that can be attracted by a magnet are called magnetic materials. examples cobalt, nickel, iron, steel.

Materials that can't be attracted by a magnet are called non-magnetic materials. examples aluminium, copper, wood, plastic, real gold

​Properties of magnet

1) magnet has two poles, North and South poles

2) the poles are the places where the magnetic force is strongest

3) Like poles repel and unlike poles attract

4) Magnet always comes to rest in the North/South direction when allowed to swing freely

Application of magnet

magnet is used in making compass

magnetic toys

Fridges door have magnets

Magnets are for separation techniques

For generating electricity

Multiple Choice

Magnet is from a word called

• manganese

• magnetite

• magnet

• magnetic

Multiple Choice

A magnet allowed to swing freely would always come to rest in the direction of

• East

• South west

• North-South

• South- east

Multiple Choice

Which of these is not a magnetic material

• steel

• cobalt

• iron

• gold

Multiple Choice

like poles of a magnet will always

• like each other

• repel each other

• attract each other

• hate each other

Multiple Choice

the magnetic force is greatest at

• the sides

• every point

• center

• the poles

Multiple Choice

Which of these is non-magnetic

• aluminium

• gold

• nickel

• iron

magnetic field

A region around a magnet

A field is a region!

magnetic field is a region around a magnet where the force of the magnet can be felt

Magnetic field lines around a bar magnet

Magnetic field lines

​imaginary line along which free north pole will tend to move from

Theses lines show the strength of the magnet. the more they are the stronger the magnet. The point where the lines are closest, the stronger the magnetic field.