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# Getting A Charge Out Of Science!

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### Getting A Charge Out Of Science!

1. 1. Getting a charge out of science!<br />By<br />Carla Bridges<br />
2. 2. 4.3.16 Investigate and describe that without touching them, material that has been electrically charged pulls all other materials and may either push or pull other charged material. <br />Taken from: http://www.indianastandardsresources.org/files/sci/sci_4_3_16.pdf<br />Science Standard<br />
3. 3. Students will be able to demonstrate that without touching them, charged materials may be pushed or pulled by material that has been electrically charged.<br />Purpose<br />
4. 4. For the teacher:<br />2 balloons<br />2 lengths of string 3 meters long<br />Felt tip pen<br />Adhesive tape<br />Wool cloth<br />Materials<br />
5. 5. Inflate one balloon and hang it from the doorway about eye level with the students.<br />Write definitions of the following on the board. Discuss before putting the correct definition.<br />Pre-Activity Preparation<br />
6. 6. Static electricity- a stationary electric charge built on a insulating material.<br />Positive and negative charges<br />Each atom is made of a nucleus which has a positive electrical charge. Electrons move around the nucleus. They have a negative electric charge. ... The positive and negative charges cancel each other out.<br />Repel- to drive or force back.<br />Attract- to draw by a physical force causing or tending to cause to approach, adhere, or unite; pull .<br />Definitions<br />
7. 7. Ask students: “What is static electricity? Give examples of when<br /> you witnessed static electricity.” [Clothes that cling when coming out of the dryer, etc.]<br />Explain to students that almost all things carry a small electric<br /> charge and that objects and organisms carry two different kinds<br /> of electric charges − positive and negative.<br />Tell students that if two objects are near each other and they<br /> have the same kind of charge, they will repel or move away from<br /> each other. However, if two objects are near each other and they<br /> have different kinds of charges, they will attract or move toward<br /> each other.<br />4. Ask students: “With this new information, can you think of a time when you have seen this happen?”<br />Pre-Activity Discussion<br />
8. 8. 1. Direct students’ attention toward the balloon you fastened.<br />2. Ask students: “Have you ever witnessed a balloon having static electricity?” Briefly discuss students’ responses.<br />3. Ask a volunteer to rub the face of the balloon with a wool cloth.<br />4. Ask students: “What is happening?” [The balloon should face the student and move toward him/her.]<br />Class Demonstration<br />
9. 9. Tell students that by rubbing wool cloth on the balloon, they are creating static electricity. Remind students that rubbing two<br /> objects against each other creates friction. Tell students that the friction causes a static charge. (The friction causes a transfer of<br /> electrons, which creates the charges.)<br />Ask students: “Why is the balloon moving toward [insert student’s name]?”<br />Discuss how the student and the balloon are both electrically<br /> charged but must have opposite charges, since the balloon is<br /> attracted to him/her.<br />Activity Cont.<br />
10. 10. Ask a volunteer to inflate a second balloon and tie the balloon<br /> with string. Hang the second balloon near the first balloon.<br />Ask a volunteer to rub the balloon with wool cloth. (The student may have to “recharge” the first balloon.)<br />Tell students to stand back and observe the two balloons. Ask: “What is happening?” (Students should observe the two balloons moving away or repelling each other.)<br /> Ask students: “Why are the two balloons repelling each other?”<br />Discuss with students how the two balloons are repelling each other so they must be carrying the same kind of charge.<br />Activity Cont.<br />
11. 11. After the class has completed the activity, ask students:<br />What causes static electricity?<br />Why did the first balloon move toward you?<br />Why did the two balloons move away from each other?<br />How do you know when two objects carry the same kind<br />of charge?<br />How do you know when two objects carry opposite charges?<br />Questions for Review<br />
12. 12. Begin a class discussion of how society depends on electricity. Have students make a list on the chalkboard of ways they depend on electricity every day.<br />Have students write stories on what their lives would be like every day without electricity.<br />Language Arts Standard 4.2.4.<br />Connections<br />
13. 13. Standard Indicator 4.3.16 http://www.indianastandardsresources.org/files/sci/sci_4_3_16.pdf<br />Dictionary.com http://dictionary.reference.com/<br />Science.com <br /> http://www.sicence.com/<br />Resources<br />