En anglais

What Sticks to a Magnet

Science · Forces & Motion · ages 7-8

Name ______________________ Date ____________

Two magnets can pull together while there is still a gap between them.
Circle one: True False
Which sample will a classroom magnet attract strongly?
- A plain glass bead
- A plain rubber bead
- A bead of pure cobalt
A coin is called a nickel. Does its name tell you that it is made of pure nickel?
- No. The coin may contain a mix of metals
- Yes. Its name means it is pure nickel
- Yes. All coins named nickels contain only nickel
Which pure metal sample will not stick to a classroom magnet?
- A pure iron sample
- A pure nickel sample
- A pure copper sample
Lina predicts a sample will stick. An adult carefully tests it with a working magnet and finds no attraction. Lina should record 'stuck' to match her prediction.
Circle one: True False
Ben's magnet picked up 4 steel paperclips and 2 iron nails. How many objects did it pick up in all?
Answer: ______________
Mia's two magnets push apart when she brings them close. What is happening?
- They are repelling
- They are attracting
- They have stopped being magnets
Sam tested 8 objects with a magnet. Five stuck. How many did not stick?
Answer: ______________
Lina tested 10 objects once each. Her record says 6 stuck and 5 did not stick. Each object should be in just one group. What should she do?
- Check the record: the counts total eleven
- Keep the record: the counts total ten
- Drop one result without checking the record
Tom's magnet pulls a clip known to stick. An adult then tests an unknown object and feels no pull. Afterward, the same clip no longer sticks. What should Tom do before deciding the unknown object is not attracted?
- Keep the no-attraction result
- Decide from the object's color
- Check the magnet and test again

Answer key

For grown-ups. Fold this page away before handing over the rest.

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True · Magnetic attraction can act across a gap.
A bead of pure cobalt · Cobalt is strongly attracted. Plain glass and rubber do not stick in this test.
No. The coin may contain a mix of metals · A coin's name is not a list of its materials. A nickel coin may contain a mix of metals.
A pure copper sample · Copper does not stick in this test. Iron and nickel are strongly attracted.
False · Record the observed result, even when it differs from the prediction. Lina should record that the sample did not stick.
6 · Add the two recorded groups: four plus two equals six objects.
They are repelling · Repelling means pushing apart.
3 · Eight take away five leaves three objects that did not stick.
Check the record: the counts total eleven · Six plus five is eleven, but Lina tested ten objects. She should check the record instead of accepting it or removing a result without checking.
Check the magnet and test again · The final check did not work. An adult should check the magnet, get the known clip to stick again, and then repeat the unknown object's test.