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Александр Сергеевич Пушкин. Трагедия «Борис Годунов» | Русская литература 7 класс #13 | Инфоурок

Александр Сергеевич Пушкин. Трагедия «Борис Годунов» | Русская литература 7 класс #13 | Инфоурок

Channel: ИНФОУРОК

Виды излучений. Источники света. Виды спектров. Спектральный анализ | Физика 11 класс #35 | Инфоурок

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Channel: ИНФОУРОК

Трение в природе и технике | Физика 7 класс #24 | Инфоурок

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Channel: ИНФОУРОК

Давление в жидкости и газе | Физика 7 класс #29 | Инфоурок

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Channel: ИНФОУРОК

Математический анализ, 25 урок, Определенный интеграл. Формула Ньютона-Лейбница

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Великая французская буржуазная революция | Всемирная история 7 класс #23 | Инфоурок

Великая французская буржуазная революция | Всемирная история 7 класс #23 | Инфоурок

Channel: ИНФОУРОК

инфоурок

школа

видеоуроки

7 класс

физика

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[music] the

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effect of liquid and gas on a

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body immersed in them; when

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swimming in a pool, you can easily

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hold a person with

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significant weight in your arms; however, if you go

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ashore, you will not be able to lift him off the

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ground. How to explain this phenomenon? Let’s

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conduct an experiment; take a

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foam ball and lower it at the bottom the

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ball begins to move and ends up on the

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surface, remember what is the

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reason for the change in speed, correct

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force, it means that a body immersed in water is

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acted upon by a certain force pushing

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it out of the water, and what will happen if

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you place the same metal ball in the same vessel,

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it will sink, is there really a

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buoyant force on it didn’t

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work, let’s conduct another experiment

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to answer this question,

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let’s place a metal cylinder suspended on a spring with

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water, the tension of the

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spring has become less, this means that a buoyant force

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also acts on the load from the side of the liquid, let

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’s consider what forces act on a

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submerged body in the shape of a rectangular

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parallelepiped, we already know that

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liquid just as the gas will

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transmit pressure in all directions,

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which means that it will act on a body placed in a liquid

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on each face;

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we depict these forces in the figure; the forces

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f3 and f4, which act on the

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side faces, are equal in

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magnitude and balance each other;

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these forces only a little sagem body,

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however, the forces acting on the upper face

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f1 and on the lower face f2 will differ; we can

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explain this with increasing depth, the

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pressure of the liquid on the body increases,

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since the height at which the lower

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face is located is less than the height of the upper faces

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relative to the surface of the water, then the

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modulus of the pressure force on the upper face

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will be less than on the lower area of the

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upper and lower faces, the

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resultant forces f2 and f1 are identical,

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directed in opposite directions,

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we calculate it as the difference in modules, it is

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directed upwards on the

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side of the larger force and is the

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same buoyant force

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that we observed in experiments, otherwise this

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force is called the Archimedean force, it is designated

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f with index, namely, Archimedes determined

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the characteristics on which this

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force depends. The action of the Archimedes force

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also applies to gas and the action of

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this force can be observed when

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balloons rise up,

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however, it is obvious that the magnitude of the

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buoyancy force of air is much

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less than the buoyancy force of water. Let’s conduct an

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experiment; a vessel with liquid will place two balloons,

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one of of which the metal one and the second one

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is made of polystyrene, the metal ball

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sank and the foam ball floated up,

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let's try to give an explanation for the

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experiment, each ball placed in water is

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acted upon by a pair of villages, the force of gravity

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directed down to the center of the earth and the force of

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Archimedes

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directed in the opposite direction,

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if the force of gravity is less than the force of Archimedes,

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then the body floats up if the force of gravity is

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greater than the force of Archimedes the body sinks and if

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the forces are equal the body will float in water

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the force of Archimedes is directed upward therefore the

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weight of the body in water is less than the weight of the body in

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the air the difference between these values is

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numerically equal to the force of Archimedes and a little

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later we will learn another way to

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calculate the force Archimedes, we will solve the problem

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proposed by Gregory Ostroy, who,

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it turns out, wrote not only harmful

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advice

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where respectable crucian carp have more weight in their

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native lake or in someone else's frying pan in

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someone else's frying pan, solid ones in Russia are

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much more significant if they are not gutted,

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since all bodies in the water are affected by the

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force of Archimedes, which is directed up

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therefore the weight of the body in water will be less than the

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weight of the body in the air

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