Do now! Do you know the formulae for Wenesday’s Test? D = m/V p = F/A p = ρhg p 1 V 1 = p 2 V 2 (constant temp and fixed mass) p 1 /T 1 = p 1 /T 1 (constant.

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Presentation transcript:

Do now! Do you know the formulae for Wenesday’s Test? D = m/V p = F/A p = ρhg p 1 V 1 = p 2 V 2 (constant temp and fixed mass) p 1 /T 1 = p 1 /T 1 (constant volume and fixed mass) Henry (aged 8¾)

What do you need to know about magnets?

ALL magnets have two poles NORTH seeking pole SOUTH seeking pole

Breaking a magnet produces two magnets! NS NS NNSS

Opposites attract!

Opposite poles attract and like poles repel

Magnetic materials

Iron (steel), Cobalt and Nickel

Magnetic induction

When a magnetic material is close to a magnet, it becomes a magnet itself We say it has induced magnetism N S N S magnet

Hard and Soft Magnetism

Soft Magnetism Pure iron is a soft magnetic material It is easy to magnetise but loses its magnetism easily N S beforeafter Iron nail S N N S Not a magnet N

Hard Magnetism Steel is a hard magnetic material It is harder to magnetise, but keeps its magnetism (it is used to make magnets!) N S beforeafter Steel paper clip N N S It’s a magnet! N S SN

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1. Two magnets, opposite poles facing each other 6 cm apart 2. Two magnets, like poles facing each other 6 cm apart 3. Two magnets along side each other, 5 cm apart, opposite poles opposite each other.

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