פרקטיקות אנרגיה בכבידה

3.2- חישוב גובה מקסימאלי של גוף הנזרק כלפי מעלה.

בכל זמן תנועת הגוף רק כוח הכבידה מבצע עבודה, לכן האנרגיה המכנית נשמרת.

נכתוב את משוואת שימור האנרגיה , נשתמש בביטוי האנרגיה הפוטנציאלית כבידתית.

נשווה בין האנרגיה המכנית בנקודת הזריקה B לאנרגיה המכנית בנקודה M הנקודה בה הגוף נעצר.

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נכתוב את משוואת האנרגיה בצורה מפורשת, ונבטא ממנה את גובה הנקודה M מעל הקרקע. «math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mstyle mathsize=¨24px¨»«mo mathvariant=¨bold¨ mathcolor=¨#0000FF¨»(«/mo»«msub»«mi mathvariant=¨bold¨ mathcolor=¨#0000FF¨»h«/mi»«mi mathvariant=¨bold¨ mathcolor=¨#0000FF¨»M«/mi»«/msub»«mo mathvariant=¨bold¨ mathcolor=¨#0000FF¨»)«/mo»«/mstyle»«/math»

בנקודה M הגוף נעצר רגעית, אין לגוף אנרגיה קינטית בנקודה M.

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לכן, הגוף נעצר בגובה 6,720 ק"מ מעל פני הקרקע.