Magnets and Magnetism

Which diagram shows magnets that will attract each other?/ Attraction of Magnets

- south and north together

Which statements describe the characteristics of a magnet? /Characteristics of a Magnet

-A magnet attracts objects containing iron. -A magnet repels other magnets. -A magnet attracts other magnets. -A magnet aligns with Earth's north pole.

Which statements best describe magnetic fields?/ Characteristics of Magnetic Fields

-A magnetic field is the area around a magnet where a force is exerted on certain objects. -Magnetic field lines spread out of the north end of the magnet. -Magnetic fields are three-dimensional and resemble a bubble.

If a magnet is broken into two pieces, what happens to the magnetic poles?/ Broken Magnetic Poles

-Each piece will still have a north pole and a south pole.

Understanding Earth's Magnetism

-The core is composed primarily of iron, with a small percentage of lighter elements. The outer core is in constant motion, due both to the Earth's rotation and to convection. The convection is driven by the upward motion of the light elements as the heavier elements freeze onto the inner core. -On Earth, flowing of liquid metal in the outer core of the planet generates electric currents. The rotation of Earth on its axis causes these electric currents to form a magnetic field which extends around the planet. The magnetic field is extremely important to sustaining life on Earth

Lesson Summary

All magnets have two magnetic poles and a magnetic field over which they exert force. Opposite magnetic poles attract each other, and like magnetic poles repel each other. Magnetism is the ability to be attracted by a magnet and to act as a magnet. ... Magnetite is a natural permanent magnet.

Lesson Goals:

Content Key Vocabulary: attract, repel, north and south poles, predict, force field, visible, invisible Goals and Aim 1. Using the bar magnets, experiment putting north and south poles together, see where they attract and where they repel 2. Predict and test which part of the magnet is the strongest : north, middle or south 3. Study three different magnets, predict and test which is the strongest. 4. Students will learn about Invisible/Visible force fields 5. Students will participate in discussion 6. Students will cooperate and work together in a group setting Objectives 1. Students will demonstrate an understanding of north and south poles by predicting and testing magnets 2. Students will demonstrate an understanding of prediction 3. Students will co-operate and work together 4. Students will demonstrate their understanding of force fields by filling in their work sheets, and completing the activity 5. Students will participate by answering questions, and making observations 6. Students will demonstrate working cooperatively in groups by sharing materials

Identifying Components of Earth's Magnetic Field

In the diagrams, the solid green line represents Earth's rotational axis and the dashed red line represents the magnetic field axis. Which diagram accurately shows Earth's magnetic field: -[the picture]

Key Concepts

Key Concept #1 Like magnetic poles repel one another, and opposite magnetic poles attract one another. Key concept #2 A magnetic field, which is strongest near a magnet's poles, will either attract or repel another magnet that enters the field. Key concept #3 When a material is magnetized, most of its magnetic domains are aligned. Key concept #4 Moving electric charges create a magnetic field. Key concept #5 Changing the current in an electromagnet controls the strength and direction of its magnet field. Key concept #6 Electromagnetic devices such as galvanometers, electric motors, and loudspeaker change electrical energy into mechanical energy. Key concept #7 According to Faraday's law, a voltage is induced in a conductor by a changing magnetic field. Key concept #8 The two types of generators are AC and DC generators. Key concept #9 A transformer changes the voltage and current by inducing a. Changing magnetic field in one coil. This changing field then induces an alternating current in a nearby coil with a different number of turns, Key concept #10 Most of the electrical energy generated in the US is produced using coal as an energy source. Some other sources are water (hydroelectric), nuclear energy, wind, natural gas, and petroleum.

Three magnets are placed on a plastic stick as shown in the image. Explain how the magnets need to be rearranged so that they stick together and why rearranging them this way allows them to stick together:

The magnets need to be arranged so that the blue side of one magnet faces the red side of another magnet. When they are arranged in this way, the opposite poles of the magnets will be closest together. Because opposite poles attract, the force of the magnets will make the magnets stick together.

Identifying Why a Compass Works

Why does a compass point toward Earth's geographic North Pole? Select three options: -Earth's geographic North Pole is close to the magnetic south pole. -Magnets allowed to move freely align themselves to point north. - north pole on a compass is attracted to Earth's magnetic south pole.

Maglev trains use magnets on the train and guideway to levitate the train off the track. The north pole of the magnets on the train must face the:

north pole of the magnets on the guideway so they repel.