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کلاس پنجم - گوه
کلاس پنجم
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گوه

اگر دو سطح شیبدار را به هم بچسبانیم وسیله ای به نام گوه ساخته می شود . گوه نیز مانند سطح شیبدار عمل می كند با این تفاوت كه سطح شیبدار ثابت است ولی گوه حركت می كند . مانند لبه تیز چاقو – تبر – تیغ اصلاح و .......

در گوه نیز افزایش نیرو و تغییر هت نیرو وجود دارد مثلا هنگامی كه می خواهیم تنه یك درخت را قطع كنیم بادست نمی توانیم اما با تبر یا به عبارتی با گوه می توانیم به راحتی انجام دهیم .

در گوه ما نیرو را رو به پایین وارد می كنیم اما گوه نیرو را به طرفین وارد می كند مانند شكل زیر :


در گوه هرچه ارتفاع گوه از ضخامت ته گوه بیشتر باشد افزایش نیرو بیشتر است به تصاویر زیر توجه نمایید . در همه آنها ارتفاع گوه 10سانتی متر فرض شده است اما ضخامت آنها با هم فرق می كند به نظر شما كدامیك راحت تر می تواند در یك چوب فرو رود ؟




یقینا گوه شماره 2 زیرا ضخامت آن از بقیه كمتر است ولی ارتفاع آن با بقیه برابر است پس اگر گوه شماره 1 را از طرفین بسائیم تابه شكل گوه شماره 2 درآید تیزتر وبرنده تر می شود . از همین روش در تیزكردن چاقوها ولبه های تیز تبر وغیره استفاده می شود .

مزیت مكانیكی گوه از رابطه مقابل بدست می آید :       ضخامت گوه ÷ ارتفاع گوه = مزیت مكانیكی گوه

 





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جمعه 16 بهمن 1394
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