2.2Electrostatics Ph ETCP v PDF

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Summary

This was a phet I completed in class....

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ELECTROSTATICS PHET ACTIVITY: JOHN TRAVOLTAGE AND BALLOONS Click below to access the John Travoltage PhET activity. (NOTE: By clicking the “Play” button on the image, you will not need to download the PhET—you can work with it right in your web browser.) http://phet.colorado.edu/en/simulation/john-travoltage PART 1 - STATIC CHARGE Discuss the following questions with your partner. Be prepared to share your answers with the class. 1) Describe what happens to John Travolta when he rubs his foot on the carpet and then touches the doorknob. 2) Describe the charge distribution on John Travolta after he has rubbed his foot on the carpet but before he touches the doorknob. (How much charge is there? Where is it located?) 3) Compare the time it takes for him to build up charge and the time it takes for it to all discharge when he touches the doorknob. Describe the difference. 4) Based on this observation, why do you think static discharge (like when John Travolta touches the doorknob) is often accompanied by pain, but charging (like when John Travolta rubs his feet on the carpet) is seldom even noticed? PART 2 - STATIC CLING Click on this link to access the Balloon simulation. (NOTE: By clicking the “Play” button on the image, you will not need to download the PhET—you can work with it right in your web browser.) http://phet.colorado.edu/en/simulation/balloons-and-static-electricity 5) The chart below has a column for each of three situations. Start in the first blank column and observe the charge of each of the three objects at the start of the simulation. Next, rub the balloon on the sweater and fill out the second blank column. Finally move the balloon towards the wall and fill out the third blank column. Fill in using the words “positive,” “negative,” or “neutral”

Object

Before moving anything

After balloon is rubbed on sweater, but not brought near the wall

After charged balloon is brought near the wall

Sweater

neutral

positive

positive

Balloon

neutral

negative

negative

Wall

neutral

neutral

neutral

Discuss the following questions with your partner. Be prepared to share your answers with the class.

6) In the simulation, did both the positive and negative charges move between objects? What did you observe and why? 7) What caused the balloon to gain electrons?

8) An object is polarized when it is still neutral, but the positive and negative charges have moved to opposite sides of the object. Did this happen to any of the objects in this simulation? Which object, and when?...