بوابة الثانوية العامة المصرية - science primary 5 new Mr.Mohab elsakka

بوابة الثانوية العامة المصرية (https://www.thanwya.com/vb/index.php)

- ترم أول (https://www.thanwya.com/vb/forumdisplay.php?f=949)

- - science primary 5 new Mr.Mohab elsakka (https://www.thanwya.com/vb/showthread.php?t=155322)

science primary 5 new Mr.Mohab elsakka

Unit 1 : Energy Lesson 1 : light

Light :
A form of energy that affects eye causing the sense of seeing (vision )
Difference between light energy and other forms of energy :
Lightenergy differ than other kinds of energy
Because :
It is visible energy .
Sources of light :
1. The Sun :
The main source of light on earth's surface
2. The moon :
Moon's light is a reflection of sunlight that falls on its surface .
Visible Spectrum :
Light energy which can be seen by the eye

Travel of light

v Light travels in straight lines .
Example :
The Straight line :
is The path
1.Which is taken by light rays coming from the car torch .
2.Which is taken by beam of sun rays coming from the sun and passes through a narrow hole of a window or a dark room
Activity prove that :
Light travels in straight lines
Tools : lighted candle – straight cylinder of length 50 cm
Steps :
1.Fix a lighted candle vertically
2.Put one of the 2 ends of the straight cylinder
in front of the candle flame
3.Look at the flame of the candle .
Observation :
You can see the flame
4.Bend the cylinder (not straight )
5.Try to look at the candle flame through the bent cylinder
Observation :
You can't see the flame.
Conclusion :
Light travels in straight lines

Activity prove that :
Light travels in straight lines
Tools :lighted candle – 3 cardboard screens
Steps :
1.Bring 3 pieces of cardboard , each containing a hole .
2.Put them in a row in front of a lighted candle .
Where all holes and the flame are on one straight line .
3.Look to the candle flame through the hole of the last pieces of cardboard .
Observation :
You can see the flame
4.Move any of the pieces of the cardboard to right or left
The 3 pieces are not on one straight line .
5.Try to see the candle flame through the hole of the last pieces of cardboard .
Observation :
You can't see the flame .
Conclusion :
Light travels in straight lines
Phenomena happen due to traveling the light in straight lines :
1.Formation of images through narrow holes
2.Formation of shadows
Formation of images through narrow holes :
When light travels through narrow holes :
An inverted image is formed is formed
It leads to :
Designing of photographic camera .
Activity proves that :
Light travels through narrow holes forming An inverted image :
Steps :
1.Bring a cardboard ( metallic ) box opened from on side .
2.Cover the open side by a semi-transparent paper (white balloon )
3.Make a small hole on the opposite side of the box.
In a dark room :
4.Move a lighted candle in front of the small hole
of the cardboard box Until an inverted is formed .

Observation :
An inverted image for the candle is formed
Conclusion :
Light travels through narrow holes in straight lines forming An inverted image .

v This activity is the base of idea of the camera
v This box is called pin-hole camera
by
Mr .Mohab Elsakka

Thanks so much for this effort
:022yb4::022yb4::022yb4:
:022yb4::022yb4:
:022yb4:

thank You verrrrrrrrrrrrrrrrrrrrrrrrrry much

مشكور جدا علي هذا المجهود الرائع و نرجو منك اكمال باقي الدروس

ألف شكر على المجهود بس ياريت تكمل جميلك والمنهج يكمل

السلام عليكم شكرا علي المجهود العظيم بس احنا في السعوديه وعيالنا حيمتحنوا في اول ابريل احنا عايزين العلوم والرياضيات لغات الترم التاني سنه خامسه وشكرا

جزاك الله خير على هذا النشاط الملحوظ

شكرا لمجهودك ووقتك جعله الله فى ميزان حسناتك

مشكوور جدا مستر مهاب من فصلك تحاول تنزل منهج الصف الخامس والسادس الابتدائى لغات ترم ثانى لان الكتب بتتاخر علينا مرة بالسعودية لوسمحت ساعدنى بسرعه وارجو الرد

شكرا جزيلا وأرجو أن تبدأ فى عرض دروس التيرم الثانى من الآن
الكتب بتتأخر والتيرم قصير
واحنا مش عارفين الظروف

:078111rg3::078111rg3::078111rg3::078111rg3::07811 1rg3::078111rg3::078111rg3::078111rg3::078111rg3:: 078111rg3::078111rg3::078111rg3::078111rg3::078111 rg3:مشكور كتيـــــــــــــــــــــــــــــــر ممكن سيادتكم تعمل التيرم التانى
لك جزيل الشكر:078111rg3::078111rg3::078111rg3::078111rg3:: 078111rg3::078111rg3::078111rg3::078111rg3:

بارك الله فيك و جعله فى ميزان حسناتك

شكرا لمجهودك ووقتك جعله الله فى ميزان حسناتك