Marvelous Magnets
Name something in our classroom that IS magnetic.
Name something in our classroom that is NOT magnetic.
Answers vary
How can you give a balloon a static charge?
Rub the balloon against your hair or clothes.
Helena kicks the ball with her foot.
Scott jumps over the ball without touching it.
Which student exerted a force on the ball?
Helena
A magnet has a north ______ and a south ______.
Pole
True or False:
All metals are magnetic.
False
What is an electromagnet?
A magnet that you can turn on or off with electricity
What kind of force causes an object to move?
Balanced Force or Unbalanced Force
Unbalanced Force
What is a magnetic field?
The area around a magnet that has magnetic force.
What does the word magnetic mean?
Bonus 100 points: How can you tell if something is magnetic?
Anything that sticks to a magnet is magnetic.
Try to stick a magnet to it!
Why do magnets sometimes attract other magnets, but sometimes repel other magnets?
It depends on the direction of the magnets poles.
Opposite poles attract, similar poles repel.
Which of these forces is a pull and which is a push?
(teacher should model both examples)
The push was the force that showed the teacher moving an object away from himself.
The pull was the force that showed the teacher moving an object towards himself.
What does each word mean?
Attract
Repel
Magnetic
Attract: Objects pulled together
Repel: Objects pushed apart
Magnetic: Anything that is attracted to a magnet
Sarah says she can turn a regular paper clip into a magnet.
Is she correct? Explain how she could do it.
Mr. Howe rubs a balloon against his head. The balloon has a negative charge and his hair has a positive charge.
What will happen when Mr. Howe moves the balloon slowly away from his head?
Adhya kicked the soccer ball straight up in the air, and it came back down.
What will happen the next time she kicks the ball straight up in the air? Explain how you know.
The soccer ball will come back down again. I know this because gravity causes all objects to fall towards the earth.
Name an example of a balanced force.
Name an example of an unbalanced force.
Answers vary
1. In class, our magnets could move paper clips even through a folder. Why?
2. Why can't a magnet move a paperclip from across the room?
1. The magnetic field is large enough to go through the folder and move the paper clip.
2. The distance is too large. The magnet's magnetic field is not large enough.
Will the following pairs attract or repel?
North - North
South - North
Positive - Negative
Negative - Negative
Repel
Attract
Attract
Repel
A team of 5th graders defeats a team of 2nd graders in tug of war.
Was this a balanced or unbalanced force? Explain how you know.
Unbalanced
The rope moved when the 5th graders pulled it
Emma is sitting on a swing without moving her body.
Bradley is sitting on a swing while leaning his body back and forth, and moving his legs.
What will happen to each student? Which example shows a force in motion?
Emma will stay still. Bradley will swing back and forth.
Bradley is showing a force in motion because he is moving his body, and moving on the swing.