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Уважаемые эксперты! Пожалуйста, ответьте на вопрос:
Брусок массой 1 кг скользит по наклонной плоскости; в начальный момент на вершине его скорость равна нулю. У основания наклонной плоскости скорость бруска равна 100 м/с. а) Какую работу совершает сила трения? б) Чему равна постоянная сила трения? в) Если покрыть наклонную плоскость масляной пленкой и уменьшить силу трения в 10 раз, то каким будет значение скорости бруска у основания наклонной плоскости?
Пусть, находясь на вершине наклонной плоскости, брусок имеет потенциальную энергию Его кинетическая энергия в этом положении равна нулю: а механическая энергия -- Если бы брусок падал на поверхность, на которой установлена наклонная плоскость, то в конечном положении его потенциальная энергия была бы равна нулю: кинетическая энергия -- механическая энергия -- Из закона сохранения механической энергии получим (м/с). Отсюда видно, что скорость бруска у основания наклонной плоскости не может составлять м/с, на что обратил Ваше внимание в мини-форуме консультации администратор раздела: Цитата: Roman Chaplinsky / Химик CH
Пожалуйста, перепроверьте значение скорости. Может быть, там 1 м/с?
Поэтому предположим, что см/с м/с. Часть потенциальной энергии бруска перешла в кинетическую энергию, а оставшаяся часть пошла на работу против силы трения, то есть (Дж). Сила трения совершает такую же по величине отрицательную работу.
Скользя по наклонной плоскости, брусок проходит путь, равный (см) м. Поэтому величина силы трения составляет (Н).
Если сила трения уменьшится в десять раз, то в столько же раз уменьшится и совершаемая ею отрицательная работа, а также работа силы тяжести против силы трения. Тогда Дж, (Дж), (м/с) -- такой будет величина скорости бруска у основания наклонной плоскости.
При решении задачи я использовал учебный материал, изложенный на страницах 32, 36 -- 40, 60 -- 63, 69, 71, 72 пособия [1].
Литература 1. Акскнович Л. А. и др. Физика в средней школе. -- Минск: Адукацыя i выхаванне, 2004. -- 720 с.
Об авторе:
Facta loquuntur.
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Его кинетическая энергия в этом положении равна нулю: 
а механическая энергия -- 
Если бы брусок падал на поверхность, на которой установлена наклонная плоскость, то в конечном положении его потенциальная энергия была бы равна нулю: 
кинетическая энергия -- 
механическая энергия -- 
Из закона сохранения механической энергии получим 
(м/с). Отсюда видно, что скорость бруска у основания наклонной плоскости не может составлять 
м/с, на что обратил Ваше внимание в мини-форуме консультации администратор раздела:
Roman Chaplinsky / Химик CH 
см/с
м/с. Часть потенциальной энергии бруска перешла в кинетическую энергию, а оставшаяся часть пошла на работу 
против силы трения, то есть 
(Дж). Сила трения совершает такую же по величине отрицательную работу.
(см)
м. Поэтому величина силы трения составляет 
(Н).
Дж, 
(Дж), 
(м/с) -- такой будет величина скорости бруска у основания наклонной плоскости.