إذا وضع جسم على مستوى مائل خشن يميل على الأفقي بزاوية قياسها هـ وكان على وشك
الانزلاق وقياس زاوية الاحتكاك هي ل فإن :
ا- هـ > ل
ب- هـ= ل
ج- هـ < ل
د- هـ = 2 ل
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