Static Electricity
Unit 12 - Electric Force
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1. Static Electricity is the _________________ of _____________ on insulating materials and can cause sparks when it is discharged.
2. All materials contain charge. Because they contain two types of particles: ___________________ Protons and ___________________ Electrons
3. The charges ______________  _________ each other out, which means that most materials are ____________ overall.
4. ______________ between the two objects causes electrons to be rubbed off one material onto the other one.
5. Between __________________ materials, like metals, the electrons jump right back, so no charge builds up.
6. Between __________________ materials, like a polythene rod, the electrons cannot flow back, and a charge builds up.
7. The key point is that only _____________  _____________ that are transferred.
8. Positive static charge is only because it lost ____________  __________ not because it gained ____________  _____________.
9. What happens if an object keeps gaining negative electrons? When the _____________  __________ between a charge object and any “earthed” or grounded object is large enough, the electrons can __________ across the gap between two materials, causing a spark.
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