G5 Magnetism:

What substance is attracted to a magnet?

• silver

• lead

• water

• iron

What characteristics do magnetic substances have?

• They can give a "shock" when you touch them.

• They can push or pull objects they are not touching.

• They are always black and cold to touch.

• They fall faster than other objects when you drop them.

Ancient people discovered magnetic rocks called lodestone. What did they use them for?

• to start fires

• compasses

• sculptures

• telephone receivers

What must happen for an electromagnet to have a magnetic field?

• It must be heated.

• It has to be touching another magnet.

• It must be lined up with Earth's magnetic field.

• It must be connected to an electrical source.

What happens when two north poles of magnets are placed together?

• They repel.

• They attract.

• They cancel each other out.

• The strength of the magnet is doubled.

How is Earth's magnetic field similar to that of a magnet?

• It has a North and South poles.

• It is hundreds of miles long.

• It is made in Earth's core.

• It is shaped like a horseshoe.

What is our best evidence that Earth has a magnetic field?

• All things fall toward Earth's center.

• A compass needle lines up with it.

• Winds blow from east to west.

• Earth's oceans all have currents.

Which of these drawings correctly shows the shape of Earth's magnetic field?

• 
• 
• 

Which of the following shows the correct shape of a bar magnet's magnetic field?

• 
• 
• 

Earth's magnetic field and a bar magnet both attract particles to the same locations. Where are they?

• the middle

• all around the outside

• the North and South poles

• first to the middle, then to the ends