![]() Grades 310 and 316 will in most instances still be almost totally non-responsive.Īs for "non-magnetic" specifications: Our SS305 cables are designed to meet the mechanical performance criteria of specification MIL-DTL-18375, the federal specification for non-magnetic cable. After substantial cold working, Grade 304 may exhibit quite strong response to a magnet. All stainless steels, with the exception of the austenitic group, are strongly attracted to a magnet.Īll austenitic grades have very low magnetic permeability’s and hence show almost no response to a magnet when in the annealed condition the situation is, however, far less clear when these steels have been cold worked by wire drawing, rolling or even center-less grinding, shot blasting or heavy polishing. Magnetic permeability is the ability of a material to carry magnetism, indicated by the degree to which it is attracted to a magnet. Here’s an in depth explanation from our Engineers in the FAQ Department: In fact, they are not mutually exclusive: stainless steel is not totally non-magnetic. Investigate the metals that make up this group of materials.“ I asked for stainless steel aircraft cable, but this cable is magnetic.”Īnd it just may be both. ![]() What do you think is different about the metal items that stick to magnets compared with those that don’t? (They are all made out of the same kind of metal.)Įxplain to the students that there are certain materials that magnets stick to, namely ferromagnetic materials. Is there anything you noticed on your results list that is the same about all of the things that stick?Īre any metals in the “things that don’t stick” column? (aluminum foil) Instruct them to include any thoughts about items that acted in ways they didn’t expect.ĭid any of the items you tested surprise you? (Students may mention the aluminum or brass objects that didn’t stick to the magnet.) Students should compose a conclusion indicating which objects they were correct about in the hypothesis and which incorrect. Make a new list based on your results with columns labeled as follows:ī. ![]() ![]() Separate the objects into the two tubs based on whether they are attracted to the magnet or not. Remove the objects one at a time to test. Once all of the students (or groups) have composed their lists, tell students that it is time to complete the experiment and give each student a magnet. Students should separate the groups into the two tubs first and then make the lists. This should be done using a braillewriter for braille students so that this list can be easily accessed while looking at your results later. Based on your experience in the past with magnets and the warm up activity, compose two lists of items. You’ll first be composing a hypothesis before testing the magnets. They might stick to a magnet or they might not. Introduce the bags to the students as follows: We will be looking at various objects in today’s lab. Question: Which items in the bag will stick to the magnet? More independent groups of students may work alone while younger students and less independent students should work as groups of two. Give each student or lab group a bag full of common objects. Pick up the magnets before the following activity. Begin by having students determine what their magnet can stick to without leaving their seats.ĭiscussion: What did the magnets stick to? Share ideas about what is similar about the items that stick to the magnet It may be necessary to gather enough braillewriters for the class if many of your students use braillenotes. Students should use braillewriters rather than braillenotes for this activity if possible. Try to include several metal items that do not have any iron (like aluminum foil).Ģ small tubs for each student group (I use the tubs from mushrooms.) – Prepare a bag of common objects for each group. Repel – to act with a force that drives something away Magnetic field – the area around a magnet in which magnetism can affect other objects Magnetic pole – one of the ends of a magnet where the field of the magnet is most intense Magnet – a substance which has a magnetic field and is able to attract iron and steel Please see review at In this activity, students discover what materials attract a magnet and which don’t. This simple yet elegant activity is adapted from the FOSS Magnetism and Electricity kit and book.
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