OBJECTIVES: WARM-UP: More batteries/volts Describe how an electromagnet shows how magnetism & electricity relate to each other. (How does it work?) Identify common devices that use an electromagnet WARM-UP: More batteries/volts more coils larger iron core thick copper wire tight coils Tell at least 2 ways you can increase the strength of an electromagnet.

Which electromagnet is stronger? #1 #2 1.5 V 1.5 V Why?

Which electromagnet is stronger? #1 #2 Why?

Which electromagnet is stronger? #1 #2 Why?

Which electromagnet is stronger? #1 #2 Why?

Identifying Main Ideas As you read the section “Solenoids,” write three supporting details that further explain the main idea. (pg. 82) Main Idea A solenoid is useful because its magnetic field can be changed. Detail Detail Detail Its magnetic field can be turned on and off. Its magnetic field can have its strength changed. Its magnetic field can have its direction changed.

Solenoids - What Is Electromagnetism? The magnetic field produced by a current has three distinct characteristics. The field can be turned on or off, have its direction reversed, or have its strength changed.

Which electromagnet would be stronger? Conclusion Which electromagnet would be stronger? Draw 2 electromagnets that only have 1 variable changed. Flex Cam Show and Tell!

Describe at least 3 ways to increase the strength of an electromagnetic field. Larger iron core. More coils More batteries Thick copper wire Tight coils

Electromagnetic Fishing Derby NAME: ______________________________________ CLASS: __________________ Electromagnetic Fishing Derby Goal: Build an electromagnetic fishing rod that can lift paper clips from one container and drop them into another. *The Team 1 Derby winner will be the student who lifts & transfers the most paper clips in one minute. Requirements: Complete this packet and a working electromagnet fishing rod. Worksheet 1 – DUE _________________ Worksheet 2 – DUE ____________________ Worksheet 3 & fishing rod – DUE ___________ Fri., Apr. 19 Mon. Apr. 29 Tues. May 7

Pole Core Battery Switch ITEM MATERIAL(S) Attachments Worksheet 1 – Planning for Your Electromagnetic Fishing Pole Directions: Use this worksheet to make a detailed plan for building your electromagnetic fishing pole. After you build a first model, testing and improving it will be important steps. As you make plans and build your fishing pole, keep in mind that you may replace some parts later. Introduction: The different parts of the pole are the rod itself, a metal core wrapped in wire and powered by a battery, and a switch to turn the electromagnet on and off. In the space provided, make a detailed plan for constructing your electromagnetic fishing pole and sketch your proposed design with labels. ITEM MATERIAL(S) Draw and label your design here: Pole Core Item(s): Shape: Battery Type/Size: How Many: Switch (include in sketch) Materials: How it works: Attachments How will everything be held together? Must be iron/magnetic 9v max Biggest is lantern battery (1)

1. 2. 3. 4. 5. Worksheet 2 – Testing Your Electromagnetic Fishing Rod Name: ____________________ Class: ____________________ Worksheet 2 – Testing Your Electromagnetic Fishing Rod Directions: You will need to test your different versions of your fishing pole. Does one choice of core work better than another? Is a core with 200 turns of wire twice as strong as a core with 100 turns of wire? How will you measure the lifting ability of each fishing pole version? One way is to count how many paper clips it will lift at once. Another way would be to see how heavy an object your pole can lift. Use the table below to record the data on your tests. Remember to change only one variable at a time. Remember to consider the freshness of the battery in your testing. Description of Model Tested Example: Nail Core, 100 Coils, Tight and Neat Wind Results, Observations, and Notes Example: Picked up 12 Paper Clips, Some clips fell off when raised, light and hard to control. 1. 2. 3. 4. 5. Required Required Honors Required Optional Optional

Name: ____________________ Class: ____________________ Worksheet #3 – Derby Day HYPOTHESIS: I predict that my electromagnet will pick up & move _________________ paperclips in one minute. RESULTS: How many paperclips did your device pick up during the contest? ____________________ CONCLUSIONS: What part of your fishing pole was the most successful? EXPLAIN. CONCLUSIONS: What part of your fishing pole was the least successful? EXPLAIN. CONCLUSIONS: Identify 4 variables that affect the strength of an electromagnet. A. ________________________________________ B. ________________________________________ C. ________________________________________ D. ________________________________________

Electromagnetic Fishing Pole Rubric ITEM PTS. POSSIBLE PTS. EARNED COMMENTS WORKSHEET #1 Planning Page 7 WORKSHEET #2 Testing Page 6 WORKSHEET #3 Derby Day 4 ABLE TO PICK UP AT LEAST 1 PAPERCLIP 1 FISHING POLE & PACKET TURNED IN ON TIME 2 TOTAL 20