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инфоурок

школа

видеоуроки

7 класс

физика

00:00:00

[music]

00:00:10

transformation of one type of energy into

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another energy is constantly transforming and

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moving from one type to another; this

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can be observed during the operation of various

00:00:24

mechanisms in the world around us;

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potential energy transforms into

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kinetic energy; and the

00:00:31

potential energy of falling water from the

00:00:33

top of a waterfall turns into

00:00:35

kinetic; a wound spring

00:00:37

unwinds moves the hand along the

00:00:40

watch dial Even while swinging On a swing,

00:00:43

we will observe changes and the transition of

00:00:46

one energy into

00:00:47

another; consider the mutual transformation of

00:00:51

energy using the example of

00:00:53

Maxwell's pendulum in the initial position when the

00:00:56

disk is located at the top and the

00:00:58

thread is wound on the axes; the disk has only

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potential

00:01:02

energy; by lowering the pendulum, it begins to

00:01:05

move downward at the same time, the potential

00:01:07

energy decreases and turns into the

00:01:10

kinetic speed of the disk, increases and

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reaches its maximum in the Lower

00:01:16

position, the rotational energy below is

00:01:19

so great that it begins to wind the

00:01:22

thread on the axis of the disk and it begins to rise

00:01:25

upward as the height increases, its

00:01:27

potential energy increases,

00:01:30

but the speed of movement of the disk decreases

00:01:32

A this means that the kinetic energy

00:01:35

decreases at the top, the disk stops for a moment,

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that is, the kinetic

00:01:40

energy is zero. It has all turned into

00:01:43

potential, then the movement

00:01:45

resumes and the process is repeated

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again and again, each time the disk

00:01:51

rises to an ever smaller height. This is

00:01:54

due to the fact that part of the energy

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is spent on friction, air and friction of

00:01:58

the cord

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mutual transformation of energies can also be

00:02:03

observed when elastic bodies collide,

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for example, a rubber ball and the surface of the

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earth, raise the rubber ball to a height

00:02:13

and release it begins to fall rapidly

00:02:16

with increasing speed, the kinetic

00:02:19

energy increases, but the potential energy

00:02:21

drops in the lower position, the speed and

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kinetic energy are maximum, but the

00:02:27

potential energy is equal to zero upon impact, the ball

00:02:30

is deformed and the kinetic energy

00:02:33

turns into potential energy of the

00:02:35

compressed ball and the surface under the action of

00:02:38

elastic forces, the ball and the surface

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straighten and take their original

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shape, and the ball will bounce off the

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surface of the earth; the potential energy

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again turns into kinetic energy; with

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further rise, the kinetic energy

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again turns into potential energy

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and completely turns into it into

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that Pomace of the sword, then the process will be repeated

00:03:03

again and will be repeated until the

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energy of the system is consumed due

00:03:09

to the friction of the sword air and

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surface. Observing the transformations of

00:03:15

energy, scientists have come to the conclusion that

00:03:17

energy does not disappear and does not arise from

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nothing. it only passes from one

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type to another from one body to another,

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otherwise this statement is called

00:03:31

energy storage, and we have considered only

00:03:33

mechanical energy, other types will be

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studied in high

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school. Think and answer What

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energy transformations occur during

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archery during archery potential

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energy drawn the bowstring turns into the

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kinetic energy of the movement of the fired

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Arrow, the conversion of the potential energy of the

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wind, falling and moving water, the energy of the

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tides, environmentally friendly methods of

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generating electricity, these sources,

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possessing energy, transfer it to the wheels

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that drive the turbines.

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Connected to the shaft of an electric

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generator, such methods of generating

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electricity do not emit harmful

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pollutants surrounding

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nature

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L

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