CATEGORIES:

# Q.1: What is the scientific term for each of the following…?

Lesson one

Q.1: Write the scientific term for each of the following:

1- Ability to do work.

[----------------------------]

2- Energy stored in the object due to a work done on the object. [----------------------------]

3- Work done during the motion of an object.

[----------------------------]

4- The sum of potential and kinetic energies.

[----------------------------]

5- The stored energy in a car toy. [----------------------------]

Q. 2: Give reason for each of the following:

1- When the falling object reaches the ground, its mechanical energy equals the kinetic energy only.

--------------------------------------------------------------------------------------

2- When the launched object reaches the maximum high, its mechanical energy equals the potential energy only.

--------------------------------------------------------------------------------------

3- Potential energy increases as weight of object in increased.

--------------------------------------------------------------------------------------

4- Potential energy increases by the increase of height at which the object reaches.

--------------------------------------------------------------------------------------

Q. 3: Solve the following problems:

1- Calculate the potential energy of an object with weight = 2N at a height = 3m. from the earth's surface.

--------------------------------------------------------------------------------------

2- What is the kinetic energy of a 5 kg. body moves with 3m/s peed.

--------------------------------------------------------------------------------------

3- A friend launched your ball upward and vertically with 3m/s speed, at a 5m. height Determine the work done on the ball if you knew that its weight = 4 N with kg mass.

--------------------------------------------------------------------------------------

Q. 4: Tick (P) or (x) in front of the following statements:

1- Mechanical energy equals the sum of kinetic and light energy. ( )

2- Chemical energy is stored in the stretched spring. ( )

3- The mechanical energy for the falling object on earth's surface equals the kinetic energy only. ( )

4- Kinetic energy is inversely proportional with its speed. ( )

5- Kinetic energy is directly proportional with its mass. ( )

6- During the falling of object downwards, its potential energy decreases and its kinetic increases. ( )

7- During raising a ball, its potential increases and its kinetic decreases. ( )

Q.5: Complete:

1- Potential energy = -------------- x ----------------

2- Kinetic energy = -------------- x ----------------

3- Weight = -------------- x ----------------

4- Factors affecting kinetic energy are ---------------------, ---------------------

5- Factors affecting potential energy are ---------------------, -------------------

6- Mechanical energy is the sum of ---------------------, ------------------------

Q.6: What is meant by?

Energy: ----------------------------------------------------------------------------------

Kinetic: ----------------------------------------------------------------------------------

Potential energy: -----------------------------------------------------------------------

Mechanical energy: --------------------------------------------------------------------

Q.7: Compare between:

Kinetic and potential energies

 Kinetic Potential

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.

[------------------------------]

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.

----------------------------------------------------------------------------------

2- The needle of magnetic compass moves (deflects) in the lemon and electricity activity.

----------------------------------------------------------------------------------

3- There is some harm of technology applications of energy transformation.

----------------------------------------------------------------------------------

4- The motion of the swing looks like the motion of the pendulum.

----------------------------------------------------------------------------------

5- Increasing the temperature of the electric lamp after a period of turning it on.

----------------------------------------------------------------------------------

6- It is preferable to establish the stations of cellular phones away from the human buildings.

----------------------------------------------------------------------------------

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.

-----------------------------------------------------------------------------------

* Energy conservation law.

-----------------------------------------------------------------------------------

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.

----------------------------------------------------------------------------------------------

2- The idea working of simple electric cell.

----------------------------------------------------------------------------------------------

3- Electric circulation.

----------------------------------------------------------------------------------------------

Q.7: Mention 3 harms of technology applications of energy transformation.

----------------------------------------------------------------------------------------------

----------------------------------------------------------------------------------------------

Q.8: On operating a car engine, several transformations of energy take place. Mention some of these transformations explain this with a simple diagram.

----------------------------------------------------------------------------------------------

----------------------------------------------------------------------------------------------

Lesson 3

Q.1: What is the scientific term for each of the following…?

1- The process results in transformation of mechanical energy into heat energy

[----------------------------]

2- Heat transfers through solids from one end to another. [-----------------------]

3- Heat transfers without any need for a material medium. [----------------------]

4- Heat transfers through gas & liquid media. [---------------------------]

5- It is the condition which states the direction of heat energy from or to the object when it comes in contact with another. [----------------------------]

6- It is a form of energy which transfers from higher temperature to a lower one. [----------------------------]

Q.2: Give reason:

1- The temperature of the bicycle tire increases during using of the brakes.

----------------------------------------------------------------------------------------------

2- The freezer found at the top of the fridge.

----------------------------------------------------------------------------------------------

3- Electric heater found on the floor of the room not at the top.

----------------------------------------------------------------------------------------------

4- It is preferable to use solar heater than both electric heater and petroleum heater.

----------------------------------------------------------------------------------------------

Q.3: Put (P) or (x) with correction:

1- Heat transfers from lower temperature to higher temperature. ( )

2- Temperature is raised as speed of spheres increases. ( )

3- Density of heated molecules is higher than cooled molecules. ( )

4- Petrol fuel is one of the non permanent resources of energy. ( )

5- Solar energy is one of the permanent resources of energy. ( )

6- Transferring of heat by conduction doesn't need to media to transfer through. ( )

7- Transferring of heat by radiation needs media to transfer through. ( )

8- Friction turns mechanical energy into heat energy. ( )

9- Convection takes place through solids. ( )

Q.4: Mention activity to explain:

1- Transfer of heat from high temperature to low temperature.

----------------------------------------------------------------------------------------------

2- Friction cause raising the temperature.

----------------------------------------------------------------------------------------------

3- Heat transfer through solids by conduction.

----------------------------------------------------------------------------------------------

4- Heat transfer through air by convection & radiation.

----------------------------------------------------------------------------------------------

Q.5: Complete the following:

1- Heat transfers by ---------------------, -----------------------, ---------------------

2- Heat transfers by conduction through --------------------------

3- Transfer of heat by -------------------- doesn't need media.

4- Heat transfers by convection through ------------------ & -----------------

5- From technological applications to produce heat ----------------, -------------- and ---------------------

6- ------------------ is a permanent resource of energy and ----------------- is a non-permanent resource of energy.

7- The most of the resources depends on that energy produced by ---------------

Q.6: Define:

1- Heat energy: ---------------------------------------------------------------------------

2- Temperature: --------------------------------------------------------------------------

Q.7: your classmate put his hand beside a lighted bulb and he feels warm, when he put it above the bulb he feel warm also, but when he touch it he feel hot.

Mention the way of heat transfer in the three states.

----------------------------------------------------------------------------------------------

----------------------------------------------------------------------------------------------

----------------------------------------------------------------------------------------------

Date: 2015-12-24; view: 909

 <== previous page | next page ==> Some domestic devices which produce heat are listed in the following table. | Problem under study, clarify possible techniques to be used in collecting data and may avoid
doclecture.net - lectures - 2014-2022 year. Copyright infringement or personal data (0.017 sec.)