Warm-up, 12.01.2009

What is magnetism? What are some machines that require

magnets in order to function?

Assignment, due Friday: Cool Science Stuff, Part 2

• Bring in an article, picture, book, video, or song about a topic in science that is interesting or exciting.

– Brief (1-2 minute) presentation = 2 grades.

– Power point or poster-board presentation = 4 grades.

– Group presentation (3 people max) with Powerpoint and multimedia (music/video) = 6 grades.

– Group presentation with powerpoint, multimedia, in-class demonstration/experiment = 8 grades.

Chapter 14 Scavenger Hunt• Get into a group of three. (No, you can’t have more

than three. Yes, you can work on your own.)

• Get a book (Physical Science).

• First team to find all of the missing words gets a prize.

• All of the answers are found in chapter 14 (p. 422-449).

• You may start when I change the slide.

1) A light display that occurs when charged particles from the sun are captured by Earth’s magnetic field.

2) MRI stands for “________.”

3) DC (direct current) flows only in _____ through a wire.

4) Alternating current (AC) ________ in a regular pattern.

5) A transformer does this to the voltage of an AC.

6) The force between two magnets depends on this.

7) A magnet is surrounded by this.

8) The group of atoms with aligned magnetic poles is called the ____.

9) Three metals that are attracted by magnets are _____, 10) _____, and 11)_____.

12) Magnets are surrounded by a _____. This is strongest at the regions called 13) ______.

14) A small magnet that is used to determine north and south (directions).

15) A magnet that is broken in half will have this many poles.

16) The name of the Danish physics teacher who found that electricity and magnetism are related.17) A wire wrapped into a cylindrical wire coil is called this.18) As the current moving through a wire increases, the strength of its magnetic field ____.19) A moving electron charge is surrounded by a ____.20) An electromagnet is a (Choose one: temporary/permanent) magnet.21) In a simple motor, a(n) _________ rotates between the poles of a (n)22) _________.23) In order to create an electromagnet, you need three things: ______, 24) _______ and 25)_____.26) A gauge that measures electric current.27) An electrical current is produced by ________ or 28) _________.29) An MRI is used to take this kind of picture.30) A generator produces an electric current how?31) Create a foldable as seen on page 423 with at

least 3 items in each column.