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PULLEYS - Contenido educativo

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Subido el 4 de noviembre de 2018 por Isabel L.

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In this presentation, we are going to explain what is a pulley and their different types. 00:00:04
A pulley is a simple machine which helps apps to lift up, apply forces and transmit power. 00:00:16
And the transmission of the forces usually do using a rope. It is very important that the force which makes rope stress, cold stress. 00:00:34
While the rope is the same, the quantity of force is the same too, and it helps us to 00:01:04
know and to calculate and how much is the force that we are have to do to lift 00:01:19
up some lows. In this figure you can see a pulley and it always have a support 00:01:34
where it is an axis and the axis is through a wheel. The wheel is the pulley 00:01:53
and this Poulet always have a row path that it always that usually called 00:02:06
In a simple play, it's always a dynamic equilibrium, which is that the addiction of the force is 00:02:20
O and the addiction of revolution is always O too. So the speed of movement is 00:02:55
always the same if you see in this draw we are we are we we calculate the 00:03:12
addiction of the forces and on the left there is always there's there's only two 00:03:28
forces. The action forces of the load of the object and the stress of the rope. 00:03:39
And in the other hand, on the right, there is always two forces that are the power of 00:03:50
the force you have to do and the stress. If the rock is the same, the stress is the same. 00:04:00
So the action and the power are the same because both of them are the same of the stress of the 00:04:10
work. We could do the calculates using the revolutions. On the right hand there is a 00:04:28
a revolution that makes the wheel go to the left, and it expresses the multiplication 00:04:50
of stress and the radius of the wheel. And the other hand, on the left, the 00:05:23
multiplication between the power and the radius makes the wheel go to the 00:05:36
right. So if both of them are the same and the wheel is the same too, so the radius is the same, 00:05:51
actions and power have to be the same. So, in conclusion, in all the Texas pulleys, the power 00:06:06
is the same to the action but sometimes we use more than one play we can't use 00:06:27
mobile place and in this row you can see how it works and there is to play a 00:06:53
fixed play we have already study and and the other one is the mobile play in a 00:07:06
mobile play the actions is the same that to stress because it is holding by two 00:07:19
two ropes. I mean, they are not two ropes in the same row, but they are two pieces of this rope. 00:07:36
So the action is two stresses. In the fixed play, the power is one stress and the rope is the same. 00:07:49
So the power I have to do is the half of the action. We can ejections more than one mobile 00:08:03
play a depends on how are they connected we can we can construction different 00:08:25
kinds of hoist. In this picture you can see two that are very important. In the first one the rope 00:08:45
is not the same and as you can see you are helping the addiction and in the second one 00:08:59
and you just only are dividing the addictions into a different number of ropes and these 00:09:15
These different kinds of holes have many importance because it helps us to load a very big load 00:09:39
and we have just only to do less force. 00:10:00
Idioma/s:
en
Autor/es:
ISABEL LAFUENTE
Subido por:
Isabel L.
Licencia:
Reconocimiento - No comercial
Visualizaciones:
113
Fecha:
4 de noviembre de 2018 - 16:26
Visibilidad:
Público
Centro:
IES JAIME FERRAN
Duración:
10′ 16″
Relación de aspecto:
1.78:1
Resolución:
854x480 píxeles
Tamaño:
27.29 MBytes

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