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SECUNDARIA - 2º ESO - INERTIA - PHYSICS & CHEMISTRY - FORMACIÓN

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Subido el 17 de marzo de 2020 por Cp santodomingo algete

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Well, let's start explaining what dynamics means. 00:00:04
You can have in the palette my map. 00:00:11
I will try to explain it in a few videos. 00:00:17
Dynamics deals with movement. Movement and what causes it. 00:00:22
Normally we admit that movement is made by a force, but it is wrong, as explained in the lab last day. 00:00:28
Things can move just by inertia. This is a very important concept. 00:00:38
For example, this meteorite has come from very far away, perhaps beyond solar system limits, and it follows a straight line trajectory. 00:00:43
This is because no force has been applied to it, so it moves at a constant velocity 00:00:56
until it reaches the atmosphere, then by friction it will stop or will disintegrate. 00:01:05
Thus, if no force is applied to an object, just by inertia it will keep moving in a straight 00:01:14
line at constant velocity. This is the principle of inertia. 00:01:23
This principle was first stated by Galileo Galilei more than 400 years ago. 00:01:31
Inertia means that if no force is applied to an object, it will keep at rest 00:01:41
or moving straight at a constant velocity until a fault is applied to it. 00:01:49
Perhaps we do not appreciate what inertia means in our daily life because we are surrounded by 00:01:57
a lot of friction forces. Were we on the moon, where there's no atmosphere, then we could feel 00:02:05
this inertia. Perhaps you have practiced skiing or skating where friction is 00:02:12
really reduced you can notice what inertia is. I mean when you initiate a 00:02:22
movement it's very difficult for you to stop. Finally we can understand this 00:02:29
This inertia principle that states that when something is at rest, it will keep at rest 00:02:39
forever. 00:02:45
Or, if it's moving at a constant velocity, it will keep moving at a straight constant 00:02:46
velocity forever until the fall is applied. 00:02:54
Why these two similar sentences? 00:02:59
Well, this is because movement is always relative. 00:03:02
Relative means that there's no way to find out whether we are at rest or moving 00:03:07
in a straight forward direction at constant velocity. This is the relativity of movement. 00:03:14
Yes, this is the principle that Einstein used to give us a new concept of space and time. 00:03:23
One can appreciate this in a train station or subway station, if you prefer. 00:03:31
You are in the wagon and there is another wagon in parallel. 00:03:38
You cannot be sure whether you are moving or is the other train that is moving forward. 00:03:43
In fact, what the relativity of movement says is that you could say that you are always at rest 00:03:50
rest and the whole world, the station of course, is moving. Provide you keep moving in a straight line 00:03:59
and at constant velocity, nobody will tell you that you are not right. 00:04:10
Then, to describe the movement of someone inside our wagon, for example a boy running in our wagon, 00:04:18
we can choose either the station as a reference framework or we can say that our reference system 00:04:27
is the weapon itself and so the station will keep moving. It doesn't matter. If we want to describe 00:04:37
the movement of a car on a road we don't take into account that the earth itself is moving around the 00:04:46
sun. Well, this is all for the moment. Next videos we are studying non-constant or non-uniform 00:04:55
movement. Then we shall deal with forces. Remember, if there is no force, there is inertia. 00:05:05
Subido por:
Cp santodomingo algete
Licencia:
Reconocimiento - Compartir igual
Visualizaciones:
177
Fecha:
17 de marzo de 2020 - 21:53
Visibilidad:
Público
Centro:
CP INF-PRI SANTO DOMINGO
Duración:
05′ 13″
Relación de aspecto:
4:3 Hasta 2009 fue el estándar utilizado en la televisión PAL; muchas pantallas de ordenador y televisores usan este estándar, erróneamente llamado cuadrado, cuando en la realidad es rectangular o wide.
Resolución:
1024x768 píxeles
Tamaño:
27.62 MBytes

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