Magnetism

A magnet will pick up a nail, but not a penny because the nail

• has rust on it.
• is lighter than the penny.
• has a sharp point.
• contains iron.

When you put ring magnets on a pencil, the magnets stay apart from each other because

• magnets are too weak to stay together.
• material that makes up the magnets aren't magnetic.
• same poles of the magnets are facing each other.
• the pencil stops the force of the magnets.

Which of these is attracted to a magnet?

• iron nail
• copper penny
• piece of paper
• notebook

Magnets will stick to refrigerator doors because the doors are 

• Painted with plastic.
• Made of metal.
• Easy to open. 
• Heavy.

Which of these can move a nail lying on the table without touching the nail?

• A magnet
• String
• A wire
• A ruler

Which is NOT a use of magnets?

• Generating electricity
• Holding cabinet doors closed
• Sorting paper from plastic
• Storing information on computer hard drives.

_{^{The magnet's shown will}}

• not move
• attract
• repel
• all of the above

_{^{The magnet's shown will}}

• not move
• attract
• repel
• all of the above

Amy used a magnet to hold one piece of paper on the refrigerator. Later, she tried to use the same magnet to hold a stack of four pieces of paper, and the magnet wouldn't stick to the fridge. Why did this happen?

• The magnet needs glue
• The magnet couldn't hold due to the thickness of the paper
• Paper repels magnets
• A magnet isn't attracted to the refrigerator.

What do you call it when two magnets come together?

• attract
• iron
• poles
• repel