Name:_____________________! Date:______________________ ! Magnetism Pretest/Post-Test 1. Sarah was playing with magnets. She had one magnet on the table, and one in her hand. As she moved the magnet in her hand closer to the one on the table, the magnets suddenly snapped together. Explain why the magnets snapped together. _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ 2. Carl placed a paper clip, piece of cardboard, and magnet together like you see in the picture below. Why did the paper clip stay against the cardboard rather than to fall on the floor? __________________________________________________ __________________________________________________ __________________________________________________ __________________________________________________ __________________________________________________ __________________________________________________ __________________________________________________ 3. Kimberly placed two horseshoe magnets near each other on a table. What will happen when she lets go of the two magnets? a. b. c. d. One side of the magnet will repel and the other side will attract. The two magnets will repel and push apart The two magnets will attract and stick together. The force will be cancelled between the magnets. 4. John placed black sand and iron filings into a box and mixed them together. When mixed together, they look like a black powder. Which of the following would be the easiest way to separate the sand and the filings? a. b. c. d. Use Add Use Use a magnifying glass. water to the mixture. a magnet. a hot plate to heat the mixture. 5. Choose the letter below that contains only items that include iron. a. b. c. d. plastic straw, iron nail, paperclip wooden craft stick, plastic straw, rubber band iron nail, paperclip, sewing needle rubber band, iron nail, plastic straw 6. Magnets have a force field. a. True b. False 7. What is special about the end of a magnet? a. b. c. d. They are the same. They are the places where the magnetic force is the strongest. They are the places where the magnetic force is the weakest. There is no difference between the end of a magnet and the rest of the magnet. 8. What happens to opposite poles in a magnet? a. b. c. d. They They They They repel. sometimes attract and sometimes repel. attract. have no effect on each other. 9. What causes a compass needle to point in a certain direction? _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ 10. Where do you think magnets come from? _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ 11. If you conduct an experiment and find out that your hypothesis does not match the results, what should you do? a. change your hypothesis b. explain your hypothesis was proven wrong in your conclusion c. change your data so it proves your hypothesis as correct d. redo the experiment until your hypothesis is correct 12. If you designed an experiment to test plant growth in different types of light, what could your hypothesis be? a. I think plants that are grown while music plays will grow more than plants that are grown in silence. b. I think plants that are grown with 16 hours of light a day will grow more than plants that are grown with 3 hours of light a day. c. I think plants that are grown in sunlight will grow more than plants that are grown under florescent light. d. I think plants that are grown with no water will grow more than plants grown with no water.