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Becky Carson
4th
Week 38
Magnets – Properties of Magnets
4-5.9 Summarize the properties of magnets and
electromagnets (including polarity, attraction/repulsion, and
strength).
How are magnetism and electricity related?
Which is stronger, a magnet’s push or pull?
magnet, polarity, attract, repel, strength
• Place two ring magnets on a pencil…what happened?
• Flip the top magnet…what happened?
• PPT
• Read Properties of Magnets from AIMS (p179-180)
• Students conduct several trials to determine if two
magnets have a stronger attraction or repulsion, or if
the forces are nearly equal.
• Letter to mom
Per Group for experiment:
4 ring magnets (Two per partnership)
Tell students if the difference between the push and pull
medians is 1 cm or less, then the forces are about the
same
Name: ____________________
Date: _________
Magnetic Tug of War
Between two magnets, is the attraction stronger, is the repulsion stronger, or are
the two forces the same?
I predict _______________________________________________________
______________________________________________________________
_
PULL
Distance apart
when A moves
Trial 1
Trial 2
Trial 3
#s in order
Median
PUSH
Distance apart
when A moves
Trial 1
Trial 2
Trial 3
#s in order
Median
Find the difference between the two medians.
Is the difference less than or equal to 1cm or more than 1 cm?
Our data proves ________________________________________________
____________________
Dear __________________
Today we learned more about the properties of magnets and
electromagnets. Magnets have something called polarity. When like poles face
each other, the magnets ___________________. When unlike poles face
each other, the magnets___________________. Look at my diagram below
to understand what happens:
Like Poles
Unlike Poles
Did you know not all ______________ is attracted to a magnet. For
example, a penny does not stick to a magnet. Objects containing
___________ or ____________ are attracted to a magnet. A few examples
of these objects include _____________, ______________ and
________________.
A magnet is strongest at its _______________. Some magnets are
stronger than others. Strength can be measured by the number of
______________ a magnet will pick up.
Today I learned ____________________________________________
_____________________________________________________________
___________,