Question-12: How does John Travoltage react when the spark jumps? He did like a jerk back showing a reaction to the shock. 3. Move John Travoltage's hand close to the doorknob, then rub his foot on the carpet
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What happened when John Travoltage touched the doorknob without rubbing his foot on the carpet?
Sri K.
Adi S.
Discussion When you walk across a carpet and touch a metal doorknob, you might feel a small shock. The friction between the different materials in your footwear and the carpet gives you a static charge. (Physicists call it a triboelectric charge, meaning a charge from frictional contact.) The metal doorknob is a conductor, so the excess charge on your body jumps to the knob rapidly, creating the spark. Your nerves are sensitive to electrical impulses, so you feel the shock. In the simulation, John Travoltage's foot can be rubbed across a carpet so that his body collects charge. His arm can be rotated so that a spark will jump from his finger to the doorknob. 1. Open PhET simulation John Travoltage (https://phet.colorado.edu/en/simulation/john-travoltage). 2. Rub John Travoltage's foot back and forth against the carpet until a spark jumps from his finger to the doorknob. Question 2-2: Explain what happens when John rubs his foot on the carpet. Question 2-3: What do the blue spheres represent? Question 2-4: How does John Travoltage react when the spark jumps? 3. Move John Travoltage's hand close to the doorknob, then rub his foot on the carpet again. Question 2-5: Compared to the process you observed in Step 2, what happens differently this time? Question 2-6: How can you get the maximum charge built up on John Travoltage without producing a spark? Question 2-7: Under what circumstances—if any—will a spark jump from John Travoltage's foot to the doorknob? Why do you suppose this is (in terms of the physics involved)? 4. Rotate John Travoltage's arm so that his finger is pointing directly at the doorknob. Carefully rub his foot against the carpet without producing a spark. Question 2-8: What is the greatest number of charges you can get onto John Travoltage's body? (How many small spherical charges can be collected on his body before a discharge occurs?) Summing up: Under which conditions is a spark most likely to jump between John Travoltage and the doorknob? Describe in terms of the amount of charge on his body and the distance between his hand and the doorknob.
Andreas P.
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