Open your planner on this week’s date. Planner Planners out Magnets & Magnetic Fields Copy On a new page Do On a MWB Thursday, 14 May 2020 Pole: the end of a magnet where magnetic forces are strongest More iron filings collected at the poles of the magnet than the middle. 1. 2. 3. 4. 5. True or false: all metals can become magnets. What is the term used to describe when magnets pull together? What is the term used to describe when magnets push apart? How many poles does a magnet have? True or false: magnets are only bar shaped or horseshoe shaped. 6. True or false: magnets are only useful as toys. 1. True or false: all metals can become magnets. False. Only certain types of metals can become magents. 2. What is the term used to describe when magnets pull together? Attraction 3. What is the term used to describe when magnets push apart? Repulsion 4. How many poles does a magnet have? Two / 2 5. True or false: magnets are only bar shaped or horseshoe shaped. False. They can be any shape. 6. True or false: magnets are only useful as toys. False. They have many uses (lesson 4) Learning Intentions • To identify magnetic and non-magnetic materials • To label the poles of a magnet • To describe repulsion between like poles and attraction between opposing poles • What is magnetism? Magnetic versus Nonmagnetic Materials Safety: all coats, bags and electronic equipment should be put away. Collect a tray of materials and a magnet. One tray per pair. In pairs, determine how you can test if the materials are magnetic or nonmagnetic. Predict which materials will be magnetic or nonmagnetic. Test your idea and your predictions. Were you surprised by any of the results? • What is magnetism? Magnets The magnets that we use in practicals are called bar magnets. The end with the dimple is the north-seeking pole, the other end is the south-seeking pole. Here are some other examples of magnets… • What is magnetism? Practical: Attraction versus Repulsion In pairs, use two magnets to observe how they behave when different combinations of poles are pushed together. Place the acetate sheet over the pair of magnets before you sprinkle the iron filings. Be careful to avoid iron splinters in your hands! Write down a description of your observations when: a) Two north-seeking poles are pushed together; b) Two south-seeking poles are pushed together; c) A north-seeking and a south-seeking pole are pushed together. • What is magnetism? 1. How can you test if a material is magnetic? See if it is attracted to a magnet; if it is attracted it is a magnet. 2. What are the names of the two ends of a magnet? North pole and south pole. 3. What happens when: Repulsion a) Two like poles are pushed together? b) Two opposite poles are pushed together? Attraction • What is magnetism?