פתרונות פרקטיקות- 1- התמדה

13. ג.2.3

כדי שהגוף ינוע במורד המישור זווית נטיית המישור צריכה להיות גדולה בערך כלשהו מהזווית שבה הגוף נמצא במצב של סף תנועה.

נחשב את זווית נטיית המישור כאשר הגוף נמצא בסף תנועה.

בסף תנועה כוח החיכוך הסטטי הוא כוח חיכוך סטטי מקסימאלי. נערוך בהתאם תרשים כוחות.

הגוף מתמיד בתנועתו , מהחוק הראשון של ניוטון שקול הכוחות הפועלים על הגוף שווה לאפס.

נכתוב את משוואות התנועה נסמן את זווית נטיית המישור כאשר הגוף נמצא בסף תנועה ב- «math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mstyle mathsize=¨22px¨»«mi mathvariant=¨bold¨ mathcolor=¨#0000FF¨»§#945;«/mi»«mo mathvariant=¨bold¨ mathcolor=¨#0000FF¨»`«/mo»«/mstyle»«/math» :

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נציב את כוח הנורמל ממשוואת התנועה בציר Y במשוואת התנועה בציר X.

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בכל זווית גדולה מ 26.16 מעלות הגוף ינוע במורד המישור.