RIC-3531 Primary Science - Book D (Digital)

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Magnetic Forces Magnets – Activity 3 Lesson Focus Outcomes Energy and Change 2.6 Describes observable changes that occur in two objects that interact, identifying the energy source and the receiver. Indicators • Identifies how iron filings can show the lines of magnetic force. • Identifies how iron filings can support the ‘Law of Magnetic Poles’. Skills Focus • Records • Observes • Conducts simple tests • Identifies • Draw conclusions Background Information The ‘Law of Magnetic Poles’ states that unlike poles attract and like poles repel. Surrounding all magnets is a magnetic field which is invisible to the eye. It’s at its greatest strength at the two poles of a magnet. By sprinkling iron filings over a paper surface with a magnet underneath the ‘lines of force’ can be demonstrated. These lines of force make up the magnetic field which is the strongest at the poles. The iron filings become magnetised and collect where the magnetic forces are working their strongest. They show the ‘lines of force’. The iron filings may stand up at different angles depending on which forces around the magnet are working on them. The magnetic field is threedimensional. Before the Lesson Materials Needed Two bar magnets, paper, iron filings in container Preparation Collection of iron filings. Separate filings into several small containers with lids (film canisters are useful) to suit the number of groups. The Lesson Stimulus • Revise the forces of magnets by using two bar magnets clearly marked with ‘N’ and ‘S’ poles. Discuss what happens when ‘like’ and ‘unlike’ poles are put together. Get the students to describe the feeling when doing this (unlike poles attract, push together firmly; like poles have a repelling force stopping the magnets going together). What to Do • Place one bar magnet on a flat, non-magnetic surface (e.g. a desk). • Lay the paper over the magnet. • Sprinkle the iron filings gently over the paper (tap the paper gently if needed). • Draw what happens to the filings. Why do you think there are heavier lines near the poles? (The force of attraction is stronger at the poles.) • Gently fold the paper to form a scoop and carefully replace filings into their container. • Place two bar magnets on the desk about one centimetre apart. Try the three different pole positions. Predict the results based on the ‘Law of Magnetism’ demonstrated in the stimulus. Lay paper over the magnets. Sprinkle carefully with iron filings. Record results and replace iron filings carefully after each position. Position A – Like poles (N/N) together – will repel Position B – Like poles (S/S) together – will repel Position C – Unlike poles (N/S) together – will attract N S • Discuss the results with the class. • Did their predictions for ‘like’ or ‘unlike’ poles match the patterns of force shown by the iron filings? After the Lesson Answers 1. 2. The poles have a stronger magnetic force. 3. (a) (b) (c) Additional Activities • Challenge the students to make a class list showing the uses of magnets in our daily lives (e.g. computer disks, cassette players, compass, radio, TVs, telephones, loudspeakers, toys etc.). Review the list as it grows. • Investigate people’s jobs that involve the use of magnetism (e.g. tailors – pins/needles, mechanics – mechanic tools, window cleaners, teachers – magnetic boards). • Predict and draw what the lines of forces could look like for a horseshoe magnet. Test and compare results. The student should find the two ends of a horseshoe magnet (poles) attract each other. Why? – (Opposite poles attract.) Display Ideas • Use a digital or normal camera to record students working on experiments. Label with student texts describing what they were doing. 66 PRIMARY SCIENCE ~ R.I.C. Publications ® ~ www.ricpublications.com.au ISBN 978-1-925660-54-8 N S ©R.I.C. Publications Low Resolution Images Display Copy N N S S N S N S N S
Magnets – Activity 3 Magnetic Forces 1. Draw the lines made when iron filings are sprinkled over a magnet. 2. 3. Why do you think the filings collect mostly around the poles? Draw lines to show what patterns are made when using two magnets. Give reasons for this. a b ©R.I.C. Publications Low Resolution Images Display Copy c PRIMARY SCIENCE ~ R.I.C. Publications ® ~ www.ricpublications.com.au 67 ISBN 978-1-925660-54-8
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RIC-3531 Primary Science - Book D (Digital)

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