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Lesson 2
Q.1: Give the scientific term for:
1- The sum of potential and kinetic energies of an object under the effect of gravity is constant. [----------------------------]
2- It composed of an acid solution with two different metals dipped in that connects from outside with electric wire. [----------------------------]
3- Energy is neither destroyed nor created from nullity but can change from one from into another. [----------------------------]
4- The pollution which caused by the cellular phones stations.
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5- The pollution which is caused by car exhausts. [----------------------------]
Q.2: Write the scientific reason for:
1- Law of conservation of mechanical energy is applied by the motion of simple pendulum.
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2- The needle of magnetic compass moves (deflects) in the lemon and electricity activity.
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3- There is some harm of technology applications of energy transformation.
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4- The motion of the swing looks like the motion of the pendulum.
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5- Increasing the temperature of the electric lamp after a period of turning it on.
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6- It is preferable to establish the stations of cellular phones away from the human buildings.
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Q.3: Choose the correct answer:
1- In the solar heaters, the solar energy is directly transforms into ------------- energy. [Kinetic – sound – electric – light]
2- The electric energy transforms into kinetic energy in ---------------------
[Electric lamp – cellular phone – electric fan – electric bell]
3-when you pull the arrow and strings the -------------energy is changed into ------------ energy.
[Kinetic into potential – potential into kinetic – kinetic into heat]
3- During the hitting a -------------, ------------------- energy is transformed into ------------------ energy.
[Kinetic – sound – kinetic – potential – sound – kinetic]
4- Sum of potential and kinetic energies is ----------------- energy.
[Mechanical – chemical – light]
Q.4: What is meant by (Define):
* Law of conservation of mechanical energy.
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* Energy conservation law.
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Q.5: Complete the following:
1- During rubbing of your hand -------------- energy is converted into ----------- energy.
2- Any body still conserve the --------------------- energy that changes between --------------------- and potential energies.
3- Energy neither -------------------- nor ------------------ but change from one form to another form.
4- In the electric cell ----------------- energy is changed into ------------ energy.
5- In the dynamo ----------------- energy is changed into -------------- energy.
6- In photosynthesis ----------------- energy is changed into -------------- energy.
7- In motor ----------------- energy is changed into -------------- energy.
Q.6: Explain an activity to show:
1- Law of conservation of mechanical energy.
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2- The idea working of simple electric cell.
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3- Electric circulation.
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Q.7: Mention 3 harms of technology applications of energy transformation.
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Q.8: On operating a car engine, several transformations of energy take place. Mention some of these transformations explain this with a simple diagram.
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Lesson 3
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