Lesson 4 November 4 th, 2010 Read through the lab and make your predictions first This lab will be done with PowerPoint and with electroscopes. The electroscopes do not hold their charges well enough to get reliable results Before 6 6 Charging by Conduction Trial A During 6 6 Charging by Conduction Trial A After 6 8 Charging by Conduction Trial A What will happen if we bring a negative rod near the negatively charged electroscope? Charging by Conduction Trial A What will happen if we bring a positive rod near the negatively charged electroscope? Charging by Conduction Trial A What will happen if we bring a Neutral rod near the negatively charged electroscope? Extra - For fun Before 6 6 Placing a positive charge on the electroscope Charging by Conduction Trial B During 6 64 Charging by Conduction Trial B 6 4 After Charging by Conduction Trial B What will happen if we bring a positive rod near the positively charged electroscope? Charging by Conduction Trial B What will happen if we bring a negative rod near the positively charged electroscope? Charging by Conduction Trial B What will happen if we bring a neutral rod near the positively charged electroscope? Charging by Conduction Trial B Negative charged rod placing charge on neutral electroscope by induction with ground 6 6 4C Charging by Induction Trial A What will happen if we bring a negative rod near the positively charged electroscope? Charging by Induction Trial A What will happen if we bring a positive rod near the positively charged electroscope? Charging by Induction Trial A Positive charge placing charge on neutral electroscope by induction with ground Charging by Induction Trial B Positive rod near the negatively charged electroscope Charging by Induction Trial B Negative rod near the negatively charged electroscope Level 1Level 2Level 3Level 4 Knowledge and Understanding Understanding of content of key concepts Students answers show limited understanding of concepts. Students answers show some understanding of concepts. Students answers show considerable understanding of concepts. Students answers show thorough understanding of concepts. Communication Expression and organization of ideas and information about key concepts in oral, visual, and/or written forms Student expresses and organizes ideas and information with limited effectiveness. Student expresses and organizes ideas and information with some effectiveness. Student expresses and organizes ideas and information with considerable effectiveness. Student expresses and organizes ideas and information with a high degree of effectiveness. Application Transfer of knowledge of key concepts to unfamiliar contexts Student transfers knowledge to unfamiliar contexts with limited effectiveness. Student transfers knowledge to unfamiliar contexts with some effectiveness. Student transfers knowledge to unfamiliar contexts with considerable effectiveness. Student transfers knowledge to unfamiliar contexts with a high degree of effectiveness.