Gizmo Answers: Magnetism

Name: Date: Student Exploration: Magnetism Directions: Follow the instructions to go through the simulation. Respond to the questions and prompts in the orange boxes. Vocabulary: attract, bar magnet, ferromagnetic, magnetize, north pole, repel, south pole Prior Knowledge Questions (Do these BEFORE using the Gizmo.) 1. What happens when you place two magnets close together? After placing two magnets next to each other, they either repel or attract each other depending on the charge. 2. What objects do magnets stick to? Make a list. Iron, cobalt, steel, fridge, white board, board games, iron, paper clips, screws, nuts and bolts. 3. What do these objects have in common? They are made out of metal like steel, iron, etc. Gizmo Warm-up: What is attracted to magnets? A bar magnet is a simple rectangular magnet. If you hang a bar magnet by a string, the north pole (N) of the magnet will tend to point north while the south pole (S) of the magnet points south. 1. Look at the materials at the bottom of the Gizmo. Which ones do you think will stick to a bar magnet? Drag things on to this ne N S nickel Nickel and Iron 2. Ferromagnetic materials are strongly attracted to magnets. Drag a bar magnet and the piece of nickel onto the scribbled line. Press Play (). A. Is nickel ferromagnetic? Yes B. How do you know? After pressing play, the magnet and nickel were moved towards one another. 3. Test copper, wood, glass, and iron. Which ones are ferromagnetic? Iron is the only material that is ferromagnetic. Activity A: Attract or repel? Get the Gizmo ready: Check that the MAGNETIC FORCES tab is selected. NS Click Reset(). Question: How do magnets interact? 1. Observe: Drag two bar magnets onto the paper and press Play. Then click Reset. Change one of the magnets (either from N-S to S-N, or vice-versa). Click Play again. A. What happened the first time? (n,s + s,n) the magnets repelled each other. B. What happened the second time? The magnets attracted each other. 2. Form hypothesis: Magnets are either pulled together (attracted) or pushed apart (repelled). Based on what you have seen, when are magnets attracted and when are they repelled? My observations were that the magnets attracted each other with opposite charges like n+s but repelled when the charges were the same, like s+s or n+n. 3. Predict: Based on your hypothesis, which pairs of magnets will be attracted to each other? Which will be repelled? Record your predictions below. (Leave the result blank for now.) Left magnet Right magnet Prediction (Attract or repel?) Result (Attract or repel?) Attract N N S S N Attract N S S S S N S N S Repel Repel N N Attract Attract Repel Repel 4. Run Gizmo: Test your predictions using the Gizmo. Record your results in the table. 5. Draw conclusions: Fill in each blank below with the correct word. A. The south pole of a magnet is attracted to the North pole of another magnet. B. The south pole of a magnet is repelled by the South pole of another magnet. C. The north pole of a magnet and the north pole of another magnet will Repel each other. Activity B: Magnetic field lines Get the Gizmo ready: Click Reset and drag all objects off the paper. Select the MAGNETIC FIELD LINES tab. Question: If you scatter iron filings (little slivers of iron) around a magnet, you will see a pattern of magnetic field lines. What do these lines show you? 1. Observe: Drag one magnet onto the paper. Click Sprinkle filings and then Tap table five or six times. Click the box, click Edit Sketch the pattern you see in the box: What do you notice about the iron filings? They start to circle around the magnet. 2. Observe: Drag a second magnet next to the first. Click Sprinkle filings and then click Tap table several times. Click the box, click Edit what you see. Sketch Will these magnets be attracted or repelled? They attract each other. 3. Observe: Now switch one of the magnets. Click Sprinkle filings and then click Tap table several times. Click the box, click Edit Sketch what you see. Will these magnets be attracted or repelled? They repel each other. 4. Draw conclusions: Compare the magnetic field lines you have sketched. How can you use the field lines to tell if magnets will be attracted or repelled? You can tell if the magnets repel or attract each other by the way they circle around the magnet. In "real life" (not in the Gizmo), rub a metal paper clip with a magnet. What happens when you touch another paper clip with your magnetized paper clip? The paper clip becomes magnetized and it attracts the other paper clip because it has the magnetic properties of a magnet.