Charging by Contact and video
Wow 2 hrs of science hoorah!
Today we have an assembly, however, you are in first period for almost 2 hrs long.
I will try to make it as painless as possible today!
Today we will discuss the lab that you did yesterday in class to see if there were any questions or concerns about your results.
Today we will be covering the way a charged object can act upon a neutral object.
The process in which we will be learning today is called CHARGING by CONTACT.
NOTE: Charging by Contact
Objects become electrically charged in either of two ways: by contact or by induction.
(We will look at induction in next class)
A charged object transfers electric charge to an object with lesser charge if the two touch. When this happens, a charge flows from the first to the second object for a brief time. Charges in motion form an electric current.
Charging by contact can be demonstrated by touching an uncharged electroscope with a charged comb ( or any object really). An electroscope is a device that contains two strips of metal foil, called leaves, that hang from one end of a metal rod. A metal ball is at the other end of the rod. When the charged comb (or object) touches the ball, some of the charges on the comb ( object) flow to the leaves, which separate because they now hold like charges and repel each other. If the comb is removed, the leaves remain apart because they retain their charges. The electroscope has thus been charged by contact with the comb.
This flow of charge between objects with different amounts of charge will occur whenever possible. However, it requires a pathway for the electric charge to move along. Some materials, called conductors, allow an electric current to flow through them easily. Other materials, called insulators, strongly resist the passage of an electric current.
We will be watching a video on conductors, insulators and charging objects by contact today.
HOMEWORK:
Pease fill in the course kits on pages 13-14 as well as to complete pg 8 in the kit by reading pages 316 - 317 of the textbook.
Today we have an assembly, however, you are in first period for almost 2 hrs long.
I will try to make it as painless as possible today!
Today we will discuss the lab that you did yesterday in class to see if there were any questions or concerns about your results.
Today we will be covering the way a charged object can act upon a neutral object.
The process in which we will be learning today is called CHARGING by CONTACT.
NOTE: Charging by Contact
Objects become electrically charged in either of two ways: by contact or by induction.
(We will look at induction in next class)
A charged object transfers electric charge to an object with lesser charge if the two touch. When this happens, a charge flows from the first to the second object for a brief time. Charges in motion form an electric current.
Charging by contact can be demonstrated by touching an uncharged electroscope with a charged comb ( or any object really). An electroscope is a device that contains two strips of metal foil, called leaves, that hang from one end of a metal rod. A metal ball is at the other end of the rod. When the charged comb (or object) touches the ball, some of the charges on the comb ( object) flow to the leaves, which separate because they now hold like charges and repel each other. If the comb is removed, the leaves remain apart because they retain their charges. The electroscope has thus been charged by contact with the comb.
This flow of charge between objects with different amounts of charge will occur whenever possible. However, it requires a pathway for the electric charge to move along. Some materials, called conductors, allow an electric current to flow through them easily. Other materials, called insulators, strongly resist the passage of an electric current.
We will be watching a video on conductors, insulators and charging objects by contact today.
HOMEWORK:
Pease fill in the course kits on pages 13-14 as well as to complete pg 8 in the kit by reading pages 316 - 317 of the textbook.
posted by Mr. V. T. Smith @ Friday, October 15, 2004
5 Comments:
At 2:37 p.m.,
Anonymous said…
I was just wondering if take your kids to work day was on the half day, because if you went with a teacher then you would only get a half of a day or you would have to go to all of the meetings that they have.
At 11:35 a.m.,
Anonymous said…
Couls you give us some sites were we can find the answers to the questions about static electricity in photocopiers and electrostatic air cleaners because they are not in the text book only the painting with charges is in the text book.
At 4:03 p.m.,
Anonymous said…
I was just wondering if the lab was due on Monday. If it was can somone give me the questions because i forgot about it and forgot to being the text book home! tnks
At 12:44 p.m.,
Anonymous said…
Yeah... is the lab due on Monday? What questions do we have to answer?
At 2:18 p.m.,
Anonymous said…
yes its due monday.
Part 1.
Analyze:
1.Write a statement summarizing the response of neutral pices of paper to charged objects.
Conclude and Apply:
2.Write a hypothesis that would predict the response of any neutral objects to charged objects.
Part 2.
Analyze:
1.How did identical charged objects interact with each other?For example, how did one charged comb interact with the second charged comb?
2.List all pairs of objects that interacted in the same way as the identical objects interacted.
3.List all pairs of objects that interacted in a manner opposite to the interaction between identical objects.
Conclude and Apply:
4. Write a sentence explaining why you think that some charged objects attract each other, while some charged objects repel each other.
Thats all of the questions.Good luck!
~KELSEY~
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