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Консультация № 29023
06.11.2005, 17:22
0.00 руб.
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Здрасти!!! Подскажите, пожалуйста, как решить следующую задачу: Доска покоится на столе, на ней лежит брусок. В некотроый момент времени на доску начитает действовать горизонтальная сила F, линейно увеличивающаяся со временем. С каким ускорением будут двигаться оба тела, если между соприкасающимися поверхностями действуют силы трения? Массы доски и бруска и коэффициенты трения известны.
Приложение:
Вся проблема в ‘линейно увеличивающаяся‘.
Приложение:
Вся проблема в ‘линейно увеличивающаяся‘.
Обсуждение
Неизвестный
07.11.2005, 09:26
общий
это ответ
Здравствуйте, dreik!
Гвоздь программы - наличие силы трения. При этом, пока ускорение бруска меньше того, которое может обеспечить сила трения (k*g), то есть до значения силы F=(M+m)*k*g, брусок и доска движутся вместе без проскальзывания.
При большей силе брусок будет скользить по доске. При этом на него действует только сила трения, его ускорение будет k*g. На доску действует сила F и - в противоположную сторону - сила трения со стороны бруска. ее ускорение будет a=(F-k*m*g)/M
Гвоздь программы - наличие силы трения. При этом, пока ускорение бруска меньше того, которое может обеспечить сила трения (k*g), то есть до значения силы F=(M+m)*k*g, брусок и доска движутся вместе без проскальзывания.
При большей силе брусок будет скользить по доске. При этом на него действует только сила трения, его ускорение будет k*g. На доску действует сила F и - в противоположную сторону - сила трения со стороны бруска. ее ускорение будет a=(F-k*m*g)/M
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