Magnetic Mystery
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Magnets can attract or repel other magnets and attract certain materials like iron. Students will perform experiments to test these magnetic properties and determine which pole is north or south on magnets. They will place labels on the magnets once identified and record their results. The experiments involve using magnets to attract or repel each other when labeled north and south, and testing different materials to see which are magnetic or not. Students will answer questions in their science journal about their observations and whether their initial predictions were correct.
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Magnetism is the force of attraction or repulsion between magnetic materials. Magnets usually have two poles - a North pole and a South pole. There are two types of magnets - permanent magnets that retain their magnetism, and temporary magnets that can be magnetized but lose their magnetism over time. Magnets can exert both attractive and repulsive forces on other magnets and some non-magnetic materials depending on whether the poles are the same or opposite.
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Magnets have two poles, north and south, that exert an invisible magnetic force. Magnets either attract or repel each other depending on whether the poles that face each other are opposite or the same. If a magnet's north pole faces another's south pole, they attract, but if two same poles face each other, such as north to north, they repel each other due to the magnetic force pushing against each other. A paperclip can be identified as having a north or south pole based on whether it is attracted or repelled by the poles of a reference magnet.
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Magnets have north and south poles that attract or repel each other. Like poles repel while opposite poles attract. Magnets can attract certain metals like iron and steel. The magnetic force is invisible but can be detected using a compass. Magnets are found in many devices like computers, engines, and MRI machines. The Earth itself acts as a large magnet which allows compasses to point north.
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Magnetism is a property of a material that enables to attract or repel other materials. The presence and strength of the material’s magnetic properties can be observed by the effect of the forces of attraction and repulsion on other materials.
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Magnets are actually created by tiny spinning electrons in an atom. The electrons move about the nucleus and spin like a top, creating a tiny magnetic field.
If electrons are spinning in the same direction there is more magnetism, while electrons spinning in opposite directions cancel out each others’ magnetic fields. Magnetic fields are invisible, we can only see the effects of the magnetic force.
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— The shape of a magnetic field is revealed by magnetic field lines
Directed away from north poles and toward south poles
Magnets have two ends or poles, called north and south poles. At the poles of a magnet, the magnetic field lines are closer together.
The magnetic field lines around horse-shoe and disk magnets are closest together at the magnets’ poles. Unlike poles of magnets attract each other and like poles of magnets repel. Magnetic Poles: A region on a magnet which produces magnetic forces
The poles of a suspended magnet will align themselves to the poles of the Earth
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If a force of attraction only is possible between an object and a magnet, then the object interacting with the magnet contains a ferromagnetic substance and is considered naturally magnetic.
If a force of repulsion is only between an object and a magnet, then the object interacting with the magnet may also be a permanent magnet or a temporarily magnetized ferromagnetic material.
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Magnetic materials can be used to make permanent or temporary magnets unlike the non-magnetic materials which cannot.
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Magnetic Mystery
- 1. Magnetic Mystery Brooke Icenogle
- 2. Science Standard 4.3.15 Demonstrate that without touching them, a magnet pulls all things made of iron, and either pushes or pulls other magnets. http://dc.doe.in.gov/Standards/AcademicStandards/StandardSearch.aspx
- 3. Definitions: Magnet: an object than can attract other objects that are made up of iron, steel, or alloy. Pole: one of the two ends of a magnet where the magnetism seems to be concentrated
- 4. Background Information Magnets are a material or object that produces a magnetic field. This magnetic field is invisible but is responsible for the most notable property of a magnet: a force that pulls on other materials like iron and attracts or repels other magnets.
- 5. Purpose and Materials The purpose of this experiment is to demonstrate that without touching, magnets either push or pull other magnets. Materials needed: - Bar magnets, tape, small sticky notes, construction paper, crayons or markers, and science journal
- 6. Science Journal In your science journal, please reflect on the following: Do magnets attract everything? Are some objects easier to pick up with magnets? Which material do you think the magnet will pick up the easiest? After the experiment we will go back over your answers to see if they have changed any.
- 7. Magnet Models In this activity students will be modeling how magnets attract and repel one another. Each student will receive a piece of construction paper. Half of the class will write “N” on their chest, and the other half “S” and tape them to their chest. Students will then move slowly around the room interacting as magnets would. Once a North and South are attached, they have to remain that way until the teacher gently pushes them apart.
- 8. Magnetic Mystery Students are divided into groups of two, and each pair are given two bar magnets. One with covered ends and the other uncovered. Ask students what the difference is between the two magnets and explain why the paper is covering the ends. The goal is to determine the correct labeling of each pole. Students will create a plan to test and determine what each end is and record it in their science journals. Once ends have been determined, label them N or S and record result in journal.
- 9. Magnet Test In the box there are several different materials that are listed on the chart provided. Students are to take the bar magnets provided in the box and test the various materials using both the North and South ends of the magnet. Using the chart, record results
- 10. Assessment In the science journal, answer the following questions: Do magnets pull all things made of iron without touching them? Which materials were the magnets attracted to the most? Were your predictions correct at the beginning of the experiment? What did you observe when you placed two magnets next to each other? Why do magnets push or pull other magnets