lightning 2/11/14. bellwork what are the three ways to charge an object? friction contact induction
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Lightning2/11/14
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Bellwork
What are the three ways to charge an object?
• Friction
• Contact
• Induction
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Video
• http://videos.howstuffworks.com/discovery/406-discovery-wonders-of-weather-lightning-phenomena-video.htm
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Lightning• Charge separation within the cloud
• Positive charges at the top of the cloud
• Negative charges at the bottom of the cloud
• Clouds charge the ground by induction
• Step Leaders – come from the cloud (many kilometers long)
• Streamers – form from ground objects (only meters long)
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Types of Lightning
• Intra-Cloud (~80%)
• Cloud to Ground (~20%)
–Negative (18%)
–Positive (2%)
• Cloud to Cloud and Cloud to Air (rare)
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Negative vs. Positive Lightning
• Negative Lightning • Positive lightning
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Negative and Cloud to Cloud Lightning
Negative Lightning
Intra-Cloud Lightning
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Positive Lightning
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The Sound of Thunder
• Lightning heats up the air quickly (30,000 K) causing the air to rapidly expand.
• This is the sound that we hear.
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Lightning Videos
• http://www.youtube.com/watch?v=dukkO7c2eUE (slow motion)
• http://www.youtube.com/watch?v=8waV48897o4 (slow motion)
• http://www.youtube.com/watch?v=RDDfkKEa2ls (upwa
• http://www.youtube.com/watch?v=kYguAFZwhpUrd lightning)
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End of Notes
• Alternative Pictures Follow
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