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Консультация № 173138
10.10.2009, 19:09
0.00 руб.
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2
1
Здраввствуйте уважаемые эксперты помогиет пожалуйста с решением задачи:С горки высотой h = 2 м и основанием b = 5м съезжают санки, которые затем останавливаются,
пройдя по горизонтали путь l = 35м от основания горки. Найти коэффициент трения.
Помогите вывести формулу для решения данной задачи.
пройдя по горизонтали путь l = 35м от основания горки. Найти коэффициент трения.
Помогите вывести формулу для решения данной задачи.
Обсуждение
10.10.2009, 19:42
общий
Magma:
Потенциальная энергия
E=mgh
Работа силы трения
A=Fтр*l
По определению Fтр=kN=k*mg
По закону о сохранении энергии mgh=mv2/2
По теореме о кинетической энергии А=mv2/2
Обобщаем все вышесказанное
mgh=k*mg*l
Отсюда k=h/l=2/35=0.06
Потенциальная энергия
E=mgh
Работа силы трения
A=Fтр*l
По определению Fтр=kN=k*mg
По закону о сохранении энергии mgh=mv2/2
По теореме о кинетической энергии А=mv2/2
Обобщаем все вышесказанное
mgh=k*mg*l
Отсюда k=h/l=2/35=0.06
Об авторе:
С уважением
shvetski
С уважением
shvetski
10.10.2009, 21:01
общий
это ответ
Здравствуйте, Magma.
Изменение потенциальной энергии [$916$]Wp=mgh
сила трения на горизонтальной поверхности F2=[$956$]mg, а на наклонной - F1=[$956$]mg*cos[$945$]=[$956$]mg*b/[$8730$](b2+h2)
Итого против силы трения совершается работа, равная изменению потенциальной энергии.
A=F1*[$8730$](b2+h2)+F2*l=[$956$]mg(b+l)=[$916$]Wp
коэфициент трения [$956$]=[$916$]Wp/(mg(b+l))=h/(b+l)=2/(5+35)=0,05
Изменение потенциальной энергии [$916$]Wp=mgh
сила трения на горизонтальной поверхности F2=[$956$]mg, а на наклонной - F1=[$956$]mg*cos[$945$]=[$956$]mg*b/[$8730$](b2+h2)
Итого против силы трения совершается работа, равная изменению потенциальной энергии.
A=F1*[$8730$](b2+h2)+F2*l=[$956$]mg(b+l)=[$916$]Wp
коэфициент трения [$956$]=[$916$]Wp/(mg(b+l))=h/(b+l)=2/(5+35)=0,05
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