Bell Ringer Glass & plastic rod video: watch video and illustrate particle picture on bell ringer sheet. Keep in mind that a positively charged object.

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Presentation transcript:

Bell Ringer Glass & plastic rod video: watch video and illustrate particle picture on bell ringer sheet. Keep in mind that a positively charged object does still have some electrons... just not as many as it does protons.

WS 2 – balloons!! Go over pictures/fill in table Demo

Electroscope What do you observe when you place a charged plastic rod… a)Near the top of the electroscope? Then pulled away from the electroscope? b) On top of the electroscope? Then pulled away from the electroscope?

Electroscope What do you observe when I place a charged metal tin… a)Near the top of the electroscope? Then pulled away from the electroscope? b) On top of the electroscope? Then pulled away from the electroscope?

Big Ideas #5: Conductors allow electrons to flow through objects and are easily removed/gained. #6: Insulators do NOT allow electrons to move easily through objects and are NOT easily removed/gained.

Charged Rod and Aluminum Soda Can

Charged Rod and Plastic Water Bottle

Draw particle pictures for the metal can and plastic rod when they are brought near AND the plastic bottle and plastic rod when they are brought near. Remember there is no CONTACT! Make sure that your picture distinguishes between what is happening in the metal (conductor) and the plastic (insulator).

Big Ideas #7: Polarization is when an object’s electrons are shifted so that one part of the object is “more negative” and another region is “more positive.”