Homework 3/13

I am very sorry for not posting yesterday!!

Tuesday homework:

• ELA: 
• dictionary comprehension practice (16 questions total)
• Study spelling and vocabulary
• Cursive 5x's each are due Thursday morning so I can review before the test on Friday
• Math:
• Study guide
• Green:  all
• Pink:  1-10 (if you want to finish it, you can)
• HOTS POW
• Science: 
• Study - test is Thursday now.  Sorry for the TWO moves, but I feel the kids will perform best in this way.

Magnets Study Guide

Vocabulary:

attract:   pull towards

magnetic: describes things that attract objects containing iron

magnet:  a metal object that attracts other metal objects

repel: to push away

electromagnet:  a magnet that can be turned on and off

generator:  a machine used to make electricity

Short Answer Questions:

1.      What kind of magnet can be turned on and off?  What would this kind of magnet be used for?

A:  an electromagnet.  It can be used for moving junkyard cars that do not work anymore or other very heavy, large metal objects.  It can also be used to sort metals from plastic and glass at the recycling center.

2.     Where do you find the poles on a horseshoe magnet?

A:  On the ends of the horseshoe.       

3.     What is needed to make electricity (like in a generator)?

A:  You need a magnet and a coil of wire

4.      Which poles of two bar magnets would be attracted to each other?

A:  north and south or south and north, but never south and south or north and north  (opposites attract!)

5.     What objects are attracted to magnets?

A:  iron, steel, nickel (*but not the coin-our coins have copper in them, which does not attract), cobalt

6.    What objects are NOT attracted to magnets:

A:  copper, tin, aluminum (soda cans), paper, wood, cotton, etc.  

7.     What must an object contain for it to be attracted to a magnet?

A:  iron or magnetite

8.    What materials do you need to make a temporary magnet? How do you make a temporary magnet?

A:  For an electromagnet/temporary magnet, you need three things:  a battery, a wire, an a metal object (a screw or a nail) for the current to flow through. 

First wrap the wire around the screw.  Next, run electricity through the battery by attaching one side of the wire to the – side of the battery, and the other side to the + side of the battery.  A current is running through the wire, and the screw becomes a temporary magnet.  When you disconnect one side of the wire (or both) the current stops. 

9.     Give an example of a mineral that is magnetic.

A:  magnetite, nickel, cobalt

10.  What are some uses for magnets?

A:  compass (uses the Earth’s magnetic field to locate North), holding papers on the classroom white and blackboards or on your refrigerator, moving broken cars in junkyards, sorting large amounts of recycling, making a generator to use in a power outage, nametags for adult’s work badges, in the garage for holding up tools, etc. 

11.   Give three examples of shapes that magnets come in.

A:  bar magnet, horseshoe magnet, round magnets that we use on the board/fridge

12.  Explain how a compass works

A:  There is a bar magnet in the compass that spins, so that the north pole of the magnet points to the Earth’s north pole.

Math:  Green group: