oneone Objective: To perform simulations in order to explain how magnetism occurs in some substances Energy Note: Why are some materials magnetic? Drill: 1. Look over your answer to the homework prompt. 2. Get a Lesson Sheet from the SET. 3. Complete Activity 1 on the ditto. EEM-10B

oneone How do you think you can get the domains in a magnetic material to line up...creating a magnet? EEM-10B

oneone Activity 2: Picture This!!! Look at these pictures. Do they give you any ideas? EEM-10B

oneone AMAZING SCISSORS 1.Obtain materials from your teacher. 2.Place a handful of paperclips on your table. 3.Hold the scissors above the paperclips. 4.Record your observations in the “Initial Observation” column of Chart 1, “Magnetic Observations.” 5.Stroke the scissor blades in the same direction several times using the bar magnet. 6.Repeat step C. EEM-10B

oneone AMAZING SCISSORS 7.Record your observations in the “After Stroking” column of Chart 1, “Magnetic Observations.” 8.Strike the scissors on the table several times. 9.Repeat step C. 10.Record your observations in the “Final Observation” column of Chart 1, “Magnetic Observations.” EEM-10B

oneone INITIAL OBSERVATIONS The paper clips were not affected by the scissors. EEM-10B

oneone After Stroking The paper clips are attracted slightly to the scissors. EEM-10B

oneone Final Observations The paper clips were not affected by the scissors. EEM-10B

oneone Group Discussion Question: Using your observations and what you know about domains, can you explain what was happening in the scissors activity? 1.The scissors were not magnetized at the beginning. 2.Stroking the scissors with a magnet turned the scissors into a magnet. 3.Banging the scissors on the table destroyed the magnetism. EEM-10B

oneone Activity 4: Summary and Extension In the previous activity you stroked a magnetic material with one pole of a bar magnet to align the domains inducing magnetism in that material. There are two other ways to induce magnetism, conduction and induction. Does that sound familiar? EEM-10B

oneone Conduction: Magnetism is induced when a magnetic material comes into direct contact with a magnet. Induction: Magnetism is induced when a magnetic material is placed into the magnetic field of a magnet. EEM-10B

oneone DESTROYING MAGNETISM In order to remove the magnetic force within a magnetic material you need to cause the domain to become unaligned. This can occur in several ways. 1.Banging the temporary magnet with a hard object. 2.Heating the temporary magnet. EEM-10B

oneone Homework: Analysis Ditto - What Causes Magnetism? EEM-10B

oneone Activity 1: Drill T F 1. All magnetic materials are magnets. T F 2. A spinning electron produces a small magnetic field. T F 3. Every atom acts like a tiny magnet. T F 4. Groups of atoms that are lined up with each other are called magnetic domains. T F 5. Not all substances form magnetic domains. T F 6. In a magnetized substance all or most of the domains are arranged in the same direction. T F 7. A magnetic substance is not magnetized if the domains point in random directions. T F 8. If a magnet is broken in half, it becomes two new magnets, each with its own poles. EEM-10A

oneone Activity 2: Ditto – Exploring Domains 1.Electrons…let’s spin! 2.Substances that are not magnetic 3.What’s a domain? 4.Magnetized or not magnetized. 5.Oh No! We have to move the school! 6.I broke my magnet…or did I? EEM-10A

oneone Slide #1 A spinning atom produces a magnetic field. N _ S Let’s stand. EEM-10A

oneone Slide #2 Every atom acts like a tiny magnet. S N.

oneone Slide #3 In most substances the atoms point in random directions. These materials are not magnetic. EEM-10A

oneone Slide #4 Sometimes groups of atoms line up with each other. These groups are called magnetic domains. This is a domain. EEM-10A

oneone Slide #5 A magnetic substance is not magnetized if the domains point in random directions. Can we save the school? EEM-10A domain:

oneone Slide #6 A substance is magnetized if all or most of the domains are lined up. Mrs. Magness to the rescue!!! EEM-10A domain:.

oneone Slide #7 If a magnet is broken into two pieces, two magnets are formed each with their own north and south poles. EEM-10A S N S N S N

oneone Drill REDO T F 1. All magnetic materials are magnets. T F 2. A spinning electron produces a small magnetic field. T F 3. Every atom acts like a tiny magnet. T F 4. Groups of atoms that are lined up with each other are called magnetic domains. T F 5. Not all substances form magnetic domains. T F 6. In a magnetized substance all or most of the domains are arranged in the same direction. T F 7. A magnetic substance is not magnetized if the domains point in random directions. T F 8. If a magnet is broken in half, it becomes two new magnets, each with its own poles. EEM-10A

oneone SUMMARY NOTES EEM-10A

oneone Homework Prompt: In your log book write about how you can make a magnet. EEM-10A