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ب- جسم كتلته 4 كجم موضوع على مستوى خشن يميل على الافقى بزاوية

قياسها 30 ° ويتصل  بخيط يمر على بكرة ملساء  عند قمة المستوى ويتدلى 

من الطرف الاخر للخيط جسم كتلته  \left(ك\right) كجم  فاذا تحركت الكتلة 4

كجم من السكون  على المستوى  الى اعلى  مسافة  490 سم فى 2 ثانية فاجد 

مقدار  \left(ك\right)  علما بان معامل الاحتكاك الحركى  بين الجسم والمستوى   \frac{\sqrt{3}}{2} 

واوجد ايضا مقدار الضغط على محور البكرة 

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