HCS Science iCheck Q3 Wk 6

Sticks to Magnets iron nail steel wire magnetite Does Not Stick to Magnets plastic straw brass ring wooden craft stick Conducts Electricity iron nail steel wire screen brass ring Does Not Conduct Electricity plastic straw wooden craft stick Three bar magnets are held together. What are the magnets going to look like when the hands let go of the magnets? Which pair of sentences are true? All metals stick to magnets. All metals conduct electricity. Some metals stick to magnets. Some metals conduct electricity. Some metals stick to magnets. All metals conduct electricity. All metals stick to magnets. Some metals conduct electricity. A student has two magnets. One magnet is on top of the table. The other magnet is in his hand. He puts his hand with the magnet under the table. Why does the magnet on top of the table move? The magnetic force acts through the wood table. Magnets can stick to wooden tables. The magnetic force makes the wood table become a temporary magnet. The magnet on top and the wood table repel each other. A student has two keys. One is iron. One is aluminum. How can the student test the keys to find the one made of iron? Use a test circuit, only the iron key will conduct electricity. Use a test circuit, only the aluminum key will conduct electricity. Use a magnet, only the aluminum key will stick. Use a magnet, only the iron key will stick. Use this picture to answer the next two questions. Think about the experiment you did in class using the balance shown in the picture. What question were you gathering data to answer? How much do magnets weigh? How much force is needed to get two magnets to repel each other? How does distance between two magnets affect the force of attraction between them? If there is plastic between two magnets, how much force is needed to pull the two magnets apart? If you were writing a report about this experiment, which sentence might you include? As the distance between the magnets increases, the force of attraction decreases. Two magnets have more magnetic force when they are far apart. Plastic spacers block the force of magnetism between two magnets. Magnets weigh less when they are further apart. Use this image for the next three questions. Which question was this student testing? How many paper clips can you pick up with a magnet? How many trials are needed to pick up the most paper clips? How does the strength of magnetism change as the number of magnets increases? How can you find the average number of paper clips picked up by a magnet? What did the student use to measure the strength of attraction? Number of paper clips Number of magnets The mass of the paper clips The mass of the magnets What conclusion can be drawn from the data in the table? The average number of paper clips one magnet can pick up is 9. The more magnets you use, the fewer paper clips you can pick up. You can't make a conclusion; something is wrong because the student should have gotten the same number of paper clips for each trial. The more magnets you use, the stronger the force of magnetism. Use this image to answer the next question. The poles on the horseshoe magnet are not labeled. Explain how you could use the bar magnet to determine where the poles are on the horseshoe magnet. Use words such asattract, repel, like,andunlike. Use the image to answer the next question. A student exploring magnets discovered that she could touch a nail to a magnet, then the nail picked up a paper clip and the paper clip picked up the screw.Explain to this student what is happening. Use the words magnetism and temporary magnet.