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Консультация № 191717
09.11.2017, 19:01
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Здравствуйте, уважаемые эксперты! Прошу вас ответить на следующий вопрос:
На брусок массой m = 5 кг в горизонтальном направлении действует сила F = 20 Н. Определить ускорение, с которым движется брусок, если коэффициент трения с горизонтальной поверхностью К = 0,4.
На брусок массой m = 5 кг в горизонтальном направлении действует сила F = 20 Н. Определить ускорение, с которым движется брусок, если коэффициент трения с горизонтальной поверхностью К = 0,4.
Обсуждение
10.11.2017, 11:16
общий
это ответ
Здравствуйте, Lera!
Брусок движется под действием равнодействующей следующих сил: силы
силы 
трения, направленной противоположно силе силы 
тяжести, направленной вертикально вниз; силы 
реакции горизонтальной поверхности, направленной вертикально вверх.
При этом
Введя неподвижную систему координат
с началом 
расположенным на пути движения бруска, осью 
направленной в сторону движения бруска, и осью 
направленной вертикально вниз, получим
(м/с2).
Брусок движется под действием равнодействующей следующих сил: силы
силы трения, направленной противоположно силе силы тяжести, направленной вертикально вниз; силы реакции горизонтальной поверхности, направленной вертикально вверх.При этом
Введя неподвижную систему координат
с началом расположенным на пути движения бруска, осью направленной в сторону движения бруска, и осью направленной вертикально вниз, получим (м/с2).
Об авторе:
Facta loquuntur.
Facta loquuntur.
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