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. A generator produces an electric current how? Create a foldable as seen on page 423 with at least 3 items in each column.