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Uploaded by
Ahmed Bd
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التأثيرات الميكانيكية
http://www.madariss-achamel.com
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التأثيرات الميكانيكية
1.
ات ا
ا ة ما Iــ آ ذب ا لا ا ه اا .آ ا ط1 ات ا لا ع تا 1 ــ د ا ا ب. ا و ــ ا اع . ا اء ــ . ا ر ا ، ا ر ز ــ . ا ا ــ ة. ا ا ر ةو ا ر ا ر . م و ف فآ ة ــ ما د ا ا رض ــ : أو ازن ه أو أن ل أن آ أو ك أن . ا ة ار نآ ،ا ة ،ا ،ا ا ات ا ة : ر. ا ا ةو ات ا ة N ات ه ا و ةا ة ا ما ى ا IIــ . سو ى ىا إ ا ات ا ا ىا و 2 ــ 1ــ ى ا س Forces de contact ؟ . ذا ا ا س ا نا ي 3 ــ د أو ز س نه اا أن س،و ىا ما ا :ا ىا . * ى ا س ا ز forces de contact réparties ا ط2 ىا ا او α . ، وا أ ،ا و ا . ا و ة قا ا ة قا ا . . و آ ا 1 ــ أ د ا ى ا ؟ ا وا ا ا س 2 ــ أ . آ ا آ ا ىا 3 ــ ؟ آ ا ن ازن ا ن ا 4 ــ ه Allal Mahdade http://sciecephysique.ifrance.com 1
2.
زع .
سا ىا ز سا ىا ا ا ىا ، ا س .R أن . ى ز ه : سا ز : ىا آ . ا س آ فا ا ز ات ا ا ة أن : ط2 ا ا س.ا ه : ل دون ا ا ا ة ا س ا زع ا ه ون ا ك و ( ل أن ا س ا ) ا ا ا س أي ا دي نا ا ة R ا ا ط2 . ق وم ا ا ا ا ة ا س ا زع ا او نا ا ة R ل أن ه ك ا ك . و ه ا ا ط2 . ا ا س أي ا ϕ ل ف ا اء ل2: ىا سا ز . . forces de contact localisés * ىا سا ا ط3 . )(B و )(A . ه ا 1 ــ . آ ا ا 2 ــ أ د ا ى ا . سو ى ى ه ا ىإ 3 ــ ؟ ) (Bوا ا ، ) (Aوا ا ا س 4 ــ أ فا ةا وآ ا )(A ا فا ا ةا 5 ــ . ا )(B ا )mB = 300 g (B ) mA = 500 g : (Aوا آ ا . ا ه ا g = 9 , 81N / kg ةا س ة ه ا ا فأ ةا رة ا س ن ا ة. ا ا س و : ىا سا أ ا * ب T ا(و ه ا نا )و ا ا ةا ا Allal Mahdade http://sciecephysique.ifrance.com 2
3.
ات ا ة
: وا ا س ا : ا ا ا ي :ا ا ا : ا ب T ة: ا . ا دان وا ا ن ا سا : ا * ب T ا إ .و أ ل أو ف ا ةا ه ا ة T ات وا ا ا س : ا ه ا ي :ا ا ا : ا ب T ة: ا forces intérieures et forces extérieures ىا ر وا *ا ىا ا ا ط4 )3(S1,S2,S؟ اا ات ا 1 ــ ه ا و ى ر ى دا ا ىإ ه 2 ــ ه ا رو ه )2 (S1,Sه ا ى ا 3 ــ ا و ى ر . ى دا إ ؟ ا ا ى إ دا ا رو ا و ر . : ى دا ا ىإ ا رو ا و ى ر ا رو ا ه ا ىا ا ىا ر إ . فأ م إ م فأ ه ا ىا ا ىا ا رو . ا ا Allal Mahdade http://sciecephysique.ifrance.com 3
4.
ما
و ةا IIIا 1 ــ ا ة ا ل: ه ا ى آ ا ا . ا ء دا ا ء ى ز a F forces pressantes ىا ء: ab فا ا ا ةا : ات ا ى ا b ab ا ء وا ا س :و ا ab ا ا دي :ا ا ا عا ء : ا ا با ة : ةا ةا ما 2 ــ : ا S ا ي ا ا ءا M Pا فا F =P S ا Mو ا Fةا ةا 2 m ا Mو ا ءا S ل Pa ات ه ا ا ما و Pا ا ا 3 ــ ا . ا رض ة ز دة ما آ ا ا اء ا ي pression atmosphérique ا : آ ا : و ات أ ى س ا 1bar = 10 5 Pa *ا ر bar )(cmHg ا *ا 1cmHg = 101325 Pa atm *ا 1atm = 101325 Pa : 2 F=0,5N ، 10cmة ا إ ء ء ز فا ز ا ا 1 ــ ا ا ي ا 2 ــ رن ه ا . ة ةا ر أن ا ا 3 ــ أذآ آ :1 ــ P = 500 Pa ا 2 ــ Patm = 200 P P = 'P 3 ــ 2 Allal Mahdade http://sciecephysique.ifrance.com 4
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