January 25, Aims: Agenda. SWBAT explain how electric fields are created

Transcription

1 January 25, 2017 Aims: SWBAT explain how electric fields are created Agenda 1. Do Now 2. Class Notes 3. Guided Practice 4. Independent Practice 5. Practicing our AIMS: Homework: F.12 Electric Charges How will you help our class earn all of our S.T.R.I.V.E. Points? 100% HW Club.you in?!?! 1

2 Aim Check: 2

3 SCIENCE 8 Electric Charges F.12 Name: Date: Homeroom: Forces Telekinesis, wingardium leviosia, the force ALL SCIENCE! OBJECTIVES: By the end of class, students will be able to SWBAT explain how electric fields are created. DO NOW Directions: Read and ANNOTATE the question before you solve the problem G is the force we feel 2. In the airplane, the people felt like they were weightless because they were at the same rate as the plane. 3. The more mass you have, the the pull of gravity. 3

4 IT BEGINS WITH ATOMS WE DO: Guided Notes Matter is made of. IT S ELECTRIC! Electricity is related to and the of electrons. Electricity is created when there is an unequal distribution of electrons. Examples: Lightning is a big spark that occurs when lots of from one place to another very quickly. When you scuff your feet on carpet, your body picks up electrons from the carpet. Then, when you touch something like a metal doorknob, the to the new object and gives you a shock. 4

5 SEPARATING CHARGES Atoms start out with the same number of negative charges and positive charges Under certain conditions, electrons can be removed from, or added to atoms. ION: Removing Electrons: Adding Electrons: 3 LAWS OF ELECTRIC CHARGE 5

6 GUIDED PRACTICE 1. Summarize these verbal statements by inserting >, < or, = symbols into the blanks below: Negatively Charged Positively Charged Electrically Neutral # of e- # of p+ # of e- # of p+ # of e- # of p+ 2. Anna Litical is performing a lab in which she tests materials to determine their charge by bringing them near a negatively charged balloon and near some neutral paper bits at rest on the table. Help Anna draw conclusions from her observations choosing positive, negative, or neutral. **some may have two possible answers** a. Object A is observed to attract the paper bits; object A must be. b. Object B is observed to attract the balloon; object B must be. c. Object C is observed to repel the balloon; object C must be. d. Object D is observed to attract both the paper bits and the balloon; object D must be. e. Object E is observed to attract the paper bits and repel the balloon; object E must be. 6

7 YOU DO: Independent Practice Directions: For each key term, explain the big idea to a kindergartener. Then, draw a picture to illustrate the word. Term Concept Picture NEUTRAL POSTIVE CHARGE NEGATIVE CHARGE Check Yo Self about ATOMS 1. The charged parts of the atom are the and the. 2. The are positively charged and the are negatively charged. 3. The have no charge and will not create an electric field. 7

8 Ms. Fagan has decided to keep students focused in an unusual manner. 1. First, she stands at the door of the school, scuffing her feet back and forth on the carpet. As she does so, electrons move from the carpet to her shoes to her body. A. Draw a sketch of what is happening: B. Ms. Fagan is now charged with a type of charge. 2. Then, Ms. Fagan reaches out and touches her students on the nose when they stop tracking their paper. As she does, some electrons leave Ms. Fagan and move onto the students. A. Draw a sketch of what is happening: B. Ms. Fagan is now negatively charged. C. The student is now charged with a type of charge. 8

9 3. Two balloons are hanging from the ceiling. For each picture, determine the balloons charges and explain how you know. **CHALLENGE ACCEPTED!** 4. Jean Yuss is investigating the charge on several objects and makes the following findings. Object C Object D Object E Object F attracts B repels C attracts D attracts A repels F Jean knows that object A is negatively charged and object B is electrically neutral. What can Jean Yuss definitively conclude about the charge on objects C, D, E, and F? Explain. 9

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13 Science 8 Name: SKILL SNAPSHOT Date: Homeroom: F.12: Electric Charges Quick Notes: Like A Scholar? Yes No Redo? Yes No Read and ANNOTATE the information before you solve the problem. Directions: Support your selection by finding evidence to support your answer OR evidence to support why another is incorrect. Be sure to include at least one scientific term in your evidence Question 1. Electrical forces. Supporting evidence A. can cause objects to only attract each other B. can cause objects to only repel each other C. can cause objects to attract or repel each other D. have no effect on objects 2. An electrically neutral atom is an atom which. A. does not have any protons or electrons B. has the same number of protons and electrons C. has the same number of neutrons and electrons D. has the same number of protons, electrons and neutrons 3. An electrically charge is different from an electrically neutral atom in that the charged atom (ion). A. does not have any neutrons B. has lost one or more of its neutrons C. either has a proton or an electron present somewhere within it D. has different numbers of protons and electrons 13

14 4. Two objects are charged as shown at the right. Predict if the objects will attract, repel or not affect each other. Use ICE and key terms to explain your thoughts. 5. Two objects are charged as shown at the right. Y is neutral and X is negative. Predict if the objects will attract, repel or not affect each other. Two objects are charged as shown at the right. Predict if the objects will attract, repel or not affect each other. Use ICE and key terms to explain your thoughts. 6. You observe two balloons suspended from the ceiling. You notice that instead of hanging straight down vertically, the balloons seems to be repelling each other. Determine the balloons possible charges and explain how you know. Use ICE and key terms to explain your thoughts. 14