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The City S chool. Gulshan Senior Girls. ACTION PLAN. ALI DILSHAD. O’LEVEL PHYSICS “ELECTROSTATICS. Time line. 1 st week of August. Reinforcement. 2 nd week of August. INTRODUCTION OF ELECTROSTATICS. *test , worksheets & problems. 4 th week of August. * Charging by friction

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Presentation Transcript
slide1

The City School

Gulshan Senior Girls

ACTION PLAN

ALI DILSHAD

O’LEVEL PHYSICS

“ELECTROSTATICS

The City School/ Gulshan Senior girls/action plan 2011

slide2

Time line

1st week of August

Reinforcement

2nd week of August

INTRODUCTION OF ELECTROSTATICS

*test , worksheets & problems

4th week of August

* Charging by friction

*principle of charging

3rd week of August

* Electrostatic Induction

Laws of Electrostatics

The City School/ Gulshan Senior girls/action plan 2011

slide4

Long -termgoals

Adopt 21st Century teaching approaches to enhance students’ appreciation

of physics

The City School/ Gulshan Senior girls/action plan 2011

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Instructional Strategies and Tasks

The City School/ Gulshan Senior girls/action plan 2011

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ElectrostaticsElectrostatics, as the name implies, is the study of stationary electric charges. A rod of plastic rubbed with fur or a rod of glass rubbed with silk will attract small pieces of paper and is said to be electrically charged.

The charge on plastic rubbed with fur is defined as negative, and the charge on glass rubbed with silk is defined as positive.

slide7

ElectrostaticsElectrostatics, as the name implies, is the study of stationary electric charges. A rod of plastic rubbed with fur or a rod of glass rubbed with silk will attract small pieces of paper and is said to be electrically charged.

The charge on plastic rubbed with fur is defined as negative, and the charge on glass rubbed with silk is defined as positive.

electric charge electrically charged objects have several important characteristics
ELECTRIC CHARGEElectrically charged objects have several important characteristics:
  • Electric charge
  • Like charges repel one another; that is, positive repels positive and negative repels negative.
  • Unlike charges attract each another; that is, positive attracts negative.
  • Charge is conserved. A neutral object has no net charge. If the plastic rod and fur are initially neutral, when the rod becomes charged by the fur, a negative charge is transferred from the fur to the rod. The net negative charge on the rod is equal to the net positive charge on the fur.
  • A conductor is a material through which electric charges can easily flow. An insulator is a material through which electric charges do not move easily, if at all. An electroscope is a simple device used to indicate the existence of charge. As shown in Figure
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ELECTROSCOPE:

*The electroscope consists of a conducting knob and attached lightweight conducting leaves—commonly made of gold foil or aluminum foil.

* When a charged object touches the knob, the like charges repel and force the leaves apart. *The electroscope will indicate the presence of charge but does not directly indicate whether the charge is positive or negative.

An electroscope reports the presence of charge.

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A large charge near a neutral electroscope can make the leaves move apart. The electroscope is made of conducting material, so the positive charges are attracted to the knob by the nearby (but not touching) negatively charged rod. The leaves are left with a negative charge and therefore deflect. When the negative rod is removed, the leaves will fall.

Now, consider touching the electroscope knob with a finger while the charged rod is nearby. The electrons will be repulsed and flow out of the electroscope through the hand. If the hand is removed while the charged rod is still close, the electroscope will retain a charge. This method of charging is called charging by induction

Charging an electroscope by induction.

WORKING EXAMPLE

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Resources

Work sheets

Web sites

Different books

The City School/ Gulshan Senior girls/action plan 2011

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Solution to Anticipated Challenges

The City School/ Gulshan Senior girls/action plan 2011

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The art of teaching is the art of Assisting Discovery.

Thank

you

The City School/ Gulshan Senior girls/action plan 2011