SME
Grade 8 Science · Problem type
Magnetic pull by distance
Use this to record how a magnet’s pull falls as it moves away.
Record and look
12
6
3
2
1
1 cm
2 cm
3 cm
4 cm
5 cm
1 cm
2 cm
3 cm
4 cm
5 cm
Clips pulled across (clips)
12
6
3
2
1
The pull fell from 12 clips at 1 cm to 1 at 5 cm.
The field weakens quickly with distance.
Tap a bar at the height you want.
Assumptions
•
Set a magnet a measured distance from a pile of clips and count how many it pulls across.
•
Doubling the distance cuts the pull to half or less.
•
Forces at a distance need no contact: the field does the pulling.
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