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| How do lightning rods protect buildings from lightning? |
The lightning rod is joined to earth by a wire (conductor). This directs the electric charge to earth, which prevents the building from being damaged. |
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angela Sat, 07 Jan 2012 19:15:45 GMT |
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| Why is it unsafe to be on a beach during a lightning storm? |
People in open areas are at risk of being struck by lightning. The charges from the lightning can jump to your body. |
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angela Sat, 07 Jan 2012 19:12:08 GMT |
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| How does lightning occur in a cloud? |
The negative charge at the bottom of the cloud may induce a positive charge on the ground. The large charge difference causes a rapid electric discharge called lightning. |
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angela Sat, 07 Jan 2012 19:11:48 GMT |
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| What 3 things might you notice after an electric discharge? |
1. see a flash of light
2. feel a shock
3. hear a cracking noise |
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angela Sat, 07 Jan 2012 19:10:06 GMT |
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| The loss of static electricity as charges move off an object is called ___________. |
electric discharge |
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angela Sat, 07 Jan 2012 19:10:06 GMT |
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| Static electricity is generally produced by ___________ or __________. |
friction
induction |
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angela Sat, 07 Jan 2012 18:57:54 GMT |
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| The electric charge at rest on an object is called _________________. |
static electricity |
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angela Sat, 07 Jan 2012 18:57:54 GMT |
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| What factors make a material a good insulator? |
1. The electrons do not flow freely.
2. The electrons are tightly held in the atoms. |
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angela Sat, 07 Jan 2012 18:57:54 GMT |
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| Why are most metals good conductors? |
Some of the elctrons are free to move. |
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angela Sat, 07 Jan 2012 18:57:54 GMT |
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Which of the following is a good insulator?
a. copper
b. aluminum
c. glass
d. mercury |
glass |
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angela Sat, 07 Jan 2012 18:51:03 GMT |
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Which of the following is a good insulator?
a. plastic
b. mercury
c. copper
d. aluminum |
plastic |
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angela Sat, 07 Jan 2012 18:51:03 GMT |
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Which of the following is a good insulator?
a. aluminum
b. mercury
c. wood
d. copper |
wood |
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angela Sat, 07 Jan 2012 18:51:03 GMT |
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Which of the following is a good insulator?
a. aluminum
b. rubber
c. mercury
d. copper |
rubber |
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angela Sat, 07 Jan 2012 18:52:18 GMT |
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Which of the following is a good conductor?
a. wood
b. air
c. copper
d. glass |
copper |
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angela Sat, 07 Jan 2012 18:44:55 GMT |
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| A material in which charges cannot move freely is called ______________. |
insulator |
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angela Sat, 07 Jan 2012 18:44:55 GMT |
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| A material in which charges can move freely is called _____________. |
conductor |
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angela Sat, 07 Jan 2012 18:44:54 GMT |
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| A material in which charges can move freely is called __________. |
a conductor |
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angela Sat, 07 Jan 2012 16:42:32 GMT |
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| Can you tell if an object has a positive or a negative charge with an electroscope? |
No. You can tell whether the object is charged, but you cannot tell whether the charge is positive or negative. |
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angela Sat, 07 Jan 2012 16:42:32 GMT |
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| You can use a device called a(n) ______________ to see if something is charged. |
electroscope |
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angela Sat, 07 Jan 2012 16:34:14 GMT |
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| When you charge objects by any method, no charges are ___________ or ___________. |
created
destroyed |
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angela Sat, 07 Jan 2012 16:34:14 GMT |
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| This happens when electrons move by direct contact. |
conduction |
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angela Sat, 07 Jan 2012 16:28:37 GMT |
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| This happens when charges in an uncharged metal object are rearranged without direct contact with a charged object. |
induction |
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angela Sat, 07 Jan 2012 16:28:37 GMT |
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| This happens when electrons are "wiped" from one object to another. |
friction |
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angela Sat, 07 Jan 2012 16:28:37 GMT |
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| This happens when electrons move by direct contact. |
conduction |
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angela Sat, 07 Jan 2012 14:25:02 GMT |
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| This happens when charges in an uncharged metal object are rearranged without direct contact with a charged object. |
induction |
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angela Sat, 07 Jan 2012 14:25:02 GMT |
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| This happens when electrons are wiped from one object to another. |
friction |
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angela Sat, 07 Jan 2012 14:25:02 GMT |
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| What happens when an object gains electrons? |
The object becomes negatively charged. |
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angela Sat, 07 Jan 2012 14:21:30 GMT |
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| What happens when an object loses electrons? |
The object becomes positively charged. |
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angela Sat, 07 Jan 2012 14:21:30 GMT |
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| Why are atoms uncharged? |
They have equal numbers of protons and electrons. |
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angela Sat, 07 Jan 2012 14:21:30 GMT |
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| How do charged objects within an electric field interact? |
They either attract or repel each other. |
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angela Sat, 07 Jan 2012 13:25:06 GMT |
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| What 2 things affect the size of the electric force? |
1. the amount of charge on each object
2. the distance between the charged objects |
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angela Sat, 07 Jan 2012 13:25:06 GMT |
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| The space around a charged object in which another charged object experiences an electric force is called _____________________. |
electric field |
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angela Sat, 07 Jan 2012 13:25:06 GMT |
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| The force of attraction or repulsion on a charged particle that is due to an electric field is ____________. |
electric force |
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angela Sat, 07 Jan 2012 13:25:06 GMT |
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| The region around a charged object where an electric force is exerted on another charged object is the _____________________. |
electric field |
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angela Sat, 07 Jan 2012 13:04:41 GMT |
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| The force between charged objects is ____________________. |
electric force |
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angela Sat, 07 Jan 2012 13:04:41 GMT |
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| Electrons are ___________ charged. |
negatively |
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angela Sat, 07 Jan 2012 13:04:41 GMT |
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| Protons are ____________ charged. |
positively |
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angela Sat, 07 Jan 2012 13:04:41 GMT |
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| What does the law of electric charges state? |
Like charges repel and opposite charges attract. |
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angela Sat, 07 Jan 2012 12:59:12 GMT |
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| What 3 types of charge can an object have? |
1. positive
2. negative
3. neutral (no charge) |
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angela Sat, 07 Jan 2012 12:59:12 GMT |
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| Atoms are made of protons, neutrons, and _____________________. |
electrons |
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angela Sat, 07 Jan 2012 12:59:12 GMT |
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| All matter is made of tiny particles called ______________. |
atoms |
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angela Sat, 07 Jan 2012 12:59:12 GMT |
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