MC	5^th Grade	Standard: 03
Objective: 02. Describe how the magnetic field of Earth and a magnet are similar.
ILO:

Which of the following shows the correct shape of a bar magnetÕs magnetic field?

Correct Answer: a

MC	5^th Grade	Standard: 03
Objective: 02. Describe how the magnetic field of Earth and a magnet are similar.
ILO:

Which of the following would be the best way to observe and compare the magnetic fields of various magnets?

a. Conduct an experiment using different types of magnets and iron filings.

b. Ask a high school science teacher about the history of natural magnets.

c. Search for an Internet web site to find experiments on electricity and magnets.

d. Use a reference book and read a section about electromagnetism and magnets.

Correct Answer: a

E	5^th Grade	Standard: 03
Objective: 02. Describe how the magnetic field of Earth and a magnet are similar.
ILO:

What does the magnetic field of a bar magnet, horseshoe magnet, and disc magnet have in common?

Correct Answer:

The lines of force all curve from the North Pole to the South.

E	5^th Grade	Standard: 03
Objective: 02. Describe how the magnetic field of Earth and a magnet are similar.
ILO:

A Ôpith ballÕ is a Styrofoam ball coated with graphite. You find yourself conducting an experiment in which a pith ball has an unknown electrical charge. Your task is to determine the type of charge on the pith ball. The following materials are available to you:

Extra pith balls

Glass rod

Plastic rod

Silk

Fur

Paper

How would you determine the type of charge on the unknown pith ball?

Scoring Guide:

á Students should indicate the following:

á Like charges repel each other, and unlike charges attract each other.

á They can create a known electric charge by rubbing glass rod with silk, or by rubbing a plastic rod with fur.

á They should describe the creation of the known electric charge, then bringing that charge near the unknown pith ball to observe the effect. If the pith ball is attracted, it is opposite the known charge. If the pith ball is repelled, it is the same as the known charge.

á Students should explain what they would do using at least three paragraphs, and have correct spelling, grammar, and punctuation.

MC	5^th Grade	Standard: 03
Objective: 02. Describe how the magnetic field of Earth and a magnet are similar.
ILO:

How is EarthÕs magnetic field similar to that of a magnet?

a. it has a North and South Pole

b. it is hundreds of miles long

c. it is made in EarthÕs core

d. it is shaped like a horseshow

Correct Answer: a

MC	5^th Grade	Standard: 03
Objective: 02. Describe how the magnetic field of Earth and a magnet are similar.
ILO:

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

a. all things fall toward EarthÕs center

b. a compass needle lines up with it

c. winds blow from east to west

d. EarthÕs oceans all have currents

Correct Answer: b

MC	5^th Grade	Standard: 03
Objective: 02. Describe how the magnetic field of Earth and a magnet are similar.
ILO:

Which of these drawings correctly show the shape of EarthÕs magnetic field?

Correct Answer: a

MC	5^th Grade	Standard: 03
Objective: 02. Describe how the magnetic field of Earth and a magnet are similar.
ILO:

EarthÕs magnetic field and bar magnet both attract particles to the same locations. Where are they?

a. the middle

b. all around the outside

c. the North and South poles

d. first to the middle, then to the ends

Correct Answer: c

MC	5^th Grade	Standard: 03
Objective: 02. Describe how the magnetic field of Earth and a magnet are similar.
ILO:

After reading about ancient explorers using a rock called magnetite to build a type of compass, Cosby wondered whether this was really possible. What would be the best way for Cosby to find out if a rock could be used in a compass?

a. Search the Internet about the history of magnetite.

b. Try to build a compass using a piece of magnetite.

c. Ask his science teacher if there is a rock thatÕs magnetic.

d. Decide the book was really mixing up myth for truth.

Correct Answer: b

E	5^th Grade	Standard: 03
Objective: 02. Describe how the magnetic field of Earth and a magnet are similar.
ILO:

Why does a compass needle point north?

Correct Answer:

It is attracted to EarthÕs magnetic pole.

E	5^th Grade	Standard: 03
Objective: 02. Describe how the magnetic field of Earth and a magnet are similar.
ILO:

Describe the steps you would take to make a simple working compass.

Correct Answer:

I would take a cup of water and a slender needle that has been magnetized by a strong magnet. I would place the needle through a small piece of cork so that it would float on the surface of the water. I would figure out which direction was North by looking at the sun or the North star. The opposite direction would be South. East would be to my right and West to my left.

MC	5^th Grade	Standard: 03
Objective: 02. Describe how the magnetic field of Earth and a magnet are similar.
ILO:

The fact that a compass needle is designed to always point north tells us what?

a. Most compasses needed to be set.

b. ThereÕs too much static in the air.

c. The solar rays affects magnetism.

d. Earth is surrounded by a magnetic field.

Correct Answer: d

I	5^th Grade	Standard: 03
Objective: 02. Describe how the magnetic field of Earth and a magnet are similar.
ILO:

During a science activity, Lee noticed when you place a strong magnet near a compass, the compassÕs needle will line itself with opposite poles together. Also that when he moved the magnet around the compass and the needle will always follow the magnet. How could LeeÕs observation with a magnet and a compass relate to EarthÕs magnetic field?

a. Earth itself is a giant magnet.

b. The compassÕs needle is weak.

c. Magnets will mess up a compass.

d. EarthÕs gravity affects magnetism.

Correct Answer: a

P	5^th Grade	Standard: 03
Objective: 02. Describe how the magnetic field of Earth and a magnet are similar.
ILO:

Title: Showing Magnetic Lines of Force with A Compass

Activity Description:

Students will first predict how a compass will react when placed around a bar magnet. Next, they will investigate how magnetism extends in every possible direction around the poles of a magnet into the surrounding space. Finally, students will use these observations to write and report a conclusion of how the needle of a compass is effected by a magnet and compare this effect with EarthÕs magnetic field.

Time Needed:

45 minutes

Materials Per Group:

¥ a compass

¥ bar magnet

¥ piece of paper and a pencil

Procedure:

¥ Using a labeled diagram, predict how a compass will react when placed around a bar magnet.

Investigations #1

1. Lay a bar magnet lengthwise in the center of a piece of paper, and a place a compass about 2 inches away.

2. Observe the direction the needle is pointing and record using a diagram format by drawing a small arrow pointing in exactly the same direction as the compass needle does.

3. Move the compass to another spot and record the direction the needle is pointing.

4. Continue moving the compass around the magnet in 10 more different spots and record.

Investigations #2

¥ Repeat this experiment but place the compass further from the magnet (about 3 inches away). Move the compass around the magnet and make observations on the effects of the compassÕs needle.

Investigations #3

¥ Stand the magnet on its North end and repeat the experiment, however move the compass around to six different spots, make observations, and record.

Investigations #4

¥ Flip the magnet over on its South end and repeat the experiment, however move the compass around in six different spots, make observations, and record.

¥ Students need to then write and report to class their conclusions of the effects a magnet has on a compass. Have students compare this effect with EarthÕs magnetic field.

Scoring Guide:

Student makes and records a prediction, completes all four investigations with thoroughness and competency, records observations in a logical and accurate way, writes a meaningful conclusion based on scientific principles and includes a comparison of the EarthÕs magnetic field.....ÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉ...ÉÉÉÉ.50 pts.

Student makes and records prediction, completes all four investigations, records observations, writes a conclusion based on scientific principles, makes a comparison of the EarthÕs magnetic field but does not show a complete understanding..ÉÉ...............É.............................40 pts.

Student makes a prediction, completes most of the investigations, somewhat records observations, makes an attempt to write a conclusion but has some errors and does not make a comparison with the EarthÕs magnetic field ÉÉÉÉÉÉÉÉÉ.................................30 pts.