Electric Charge
Our Experiment
Conductors and Insulators
Electric Force
100
What are the negatively charged particles in a material?
Electrons
100
What were we trying to find out in this experiment?
Which combinations of materials cause static charge.
100
What material can easily transfer electrons from atom to atom within itself?
A conductor.
100
Fill in the blanks: opposite charges _______, similar charges _______.
Attract; repel.
200
What can you do to encourage electrons to jump onto a different material?
Rub them together and create friction.
200
Our lab this week had you rubbing fabric on different rods to move paper with static charge. Name one combination that worked.
Plastic and anything, acryllic and anything, others (check phone photos).
200
What is the name of a substance that does not allow electrons to move well inside it?
An insulator.
200
When two positive charges are put close together what will happen?
They will repel each other.
300
To get a positive charge, do positively charged atoms move together, or do negatively charged electrons move away?
Electrons move away to leave behind positively charged atomic ions.
300
The metal did not move the paper. How come?
The metal is a good conductor so the electrons rubbed on it were spread out over the whole rod. No static charge could build up.
300
Name an example of a conductor.
Metal, water...
300
What is "static" charge?
Charge that doesn't move around.
400
If an object has fewer electrons than protons, what is the charge on the object?
Fewer electrons means fewer negatives, so more positive charge.
400
What is one reason the two groups got different data?
Different individual pieces of materials or experiment techniques.
400
What happens to electrons rubbed onto an insulator?
They build up in one spot and create static charge.
400
What is the name of the unit we use to measure electric charge?
A Coulomb.
500
What is the name of the large metal machine that produces static electricity and makes your hair stand up?
Van de Graaff Generator
500
The plastic was the best at moving the paper. Why?
Two reasons: 1. It's good at taking electrons from other things. 2. It's an insulator so the static charge stays in one spot.
500
Plastic is put around copper wire to help protect you. Why?
Plastic is an insulator - electrons stay built up on the inside where the copper is and don't move through.
500
When you rub a balloon on your head and stick it to a wall, how come it only sticks in the spot you rubbed on your head?
The electrons have only moved onto the one spot on the balloon because it is a good insulator. The built up static charge enables it to attract to the wall and hold the balloon up in the one spot it has all the electrons.
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