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Консультация № 191269
07.08.2017, 15:13
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Здравствуйте! Прошу помощи в следующем вопросе:
К телу массой m =10 кг, первоначально покоившемуся на шероховатой горизонтальной поверхности, прикладывают в течение времени T =10 с горизонтальную силу. Коэффициент трения скольжения тела по поверхности равен 0,1. Найдите проекцию Vx(T) скорости
тела в момент времени T =10 с в следующих случаях:
а) сила не изменяется со временем, её величина равна F = 20 H,
направление действия силы неизменно;
б) величина силы равномерно по времени уменьшается от F = 20 H
до нуля, направление действия силы неизменно.
Положительное направление оси Ox совпадает с направлением действия силы
К телу массой m =10 кг, первоначально покоившемуся на шероховатой горизонтальной поверхности, прикладывают в течение времени T =10 с горизонтальную силу. Коэффициент трения скольжения тела по поверхности равен 0,1. Найдите проекцию Vx(T) скорости
тела в момент времени T =10 с в следующих случаях:
а) сила не изменяется со временем, её величина равна F = 20 H,
направление действия силы неизменно;
б) величина силы равномерно по времени уменьшается от F = 20 H
до нуля, направление действия силы неизменно.
Положительное направление оси Ox совпадает с направлением действия силы
Обсуждение
08.08.2017, 12:24
общий
это ответ
Здравствуйте, rita_2708!
На тело действуют сила тяжести
сила 
нормальной реакции горизонтальной поверхности, приложенная сила 
сила 
трения. Уравнение второго закона Ньютона имеет вид
или, в проекциях на оси лабораторной системы отсчёта
- вертикальную
- горизонтальную
откуда
В случае а
(м/с).
В случае б
Н. Тело движется, пока абсолютная величина силы трения не превышает абсолютной величины приложенной силы. Тогда
то есть при
(с)
тело остановится и при
с останется неподвижным.
На тело действуют сила тяжести
сила нормальной реакции горизонтальной поверхности, приложенная сила сила трения. Уравнение второго закона Ньютона имеет видили, в проекциях на оси лабораторной системы отсчёта
- вертикальную
- горизонтальную
откуда
В случае а
(м/с).В случае б
Н. Тело движется, пока абсолютная величина силы трения не превышает абсолютной величины приложенной силы. Тогдато есть при
(с)тело остановится и при
с останется неподвижным.
5
Об авторе:
Facta loquuntur.
Facta loquuntur.
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