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نخبگان ایران - نکات مهم فیزیک 2 _ فصل کار و انرژی

نخبگان ایران

:.برای هر پیروزی،تلاشی لازم است.:

 

نکات مهم فیزیک 2 _ فصل کار و انرژی

 

نوع مطلب :فیزیک ،

نوشته شده توسط:حسین

واژه های کلیدی فصل ۴

کار:

   *کار یک نیرو, حاصل ضرب نیرو در جابه جایی نقطه ی اثر آن نیرو می باشد.

   *اگر زاویه ی بین نیرو و بردار جابه جایی صفر باشد, کار نیرو مثبت است.

   *اگر زاویه ی بین نیرو و بردار جابه جایی ۱۸۰درجه باشد, کار نیرو منفی است.

   *اگر زاویه ی بین نیرو و بردار جابه جایی ۹۰درجه باشد, کار نیرو صفر است.

کارنیروی وزن:

   اگر یک جسم تا ارتفاع h بالا برده شود, کارنیروی وزن منفی است وهنگامی که جسم پایین آورده شود, کارنیروی وزن مثبت است.

توان :  آهنگ انجام یافتن کار را توان می گویند.

انرژی:

   *توانایی انجام کار را انرژی می گویند.

   *انرژی یک جسم متحرک را انرژی جنبشی می گو یند.

   *انرژی جسمی که در ارتفاع h از سطح زمین است را انرژی پتانسیل گرانشی گویند.

قضیه کار و انرژی:

   کار برآیند نیروهای وارد بر یک جسم در یک جابه جایی, برابر تغییر انرژی جنبشی جسم است.

انرژی مکانیکی:

   *مجموع انرژی جنبشی و پتانسیل یک جسم را انرژی مکانیکی نامند.

   *اگر یک دستگاه پایسته باشد(نیروی اصطکاک صفر است), تغییر انرژی مکانیکی همواره صفر است.

   *در یک دستگاه, کارنیروی اصطکاک برابر تغییر انرژی مکانیکی است.



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‘Why Andrew? You're so handsome. I'd never reject you ', I believe that He smiles at
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‘Oh, I can't know. Everything happens
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"So, make use of mind if I kissed you at this time?' he was quoted saying as I receive closer to him and kiss him.

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‘I'm keen on how we think.' , he said.

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