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Pulleys

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Subido el 28 de enero de 2020 por Isabel L.

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Well, today we are going to explain pulleys that are simple machines that can help us to lift objects easier. 00:00:00
So, this is one of the simple machines. 00:00:13
In this figure you can see a pulley. 00:00:23
And it always has a support where it is an axis and the axis is through a wheel. The wheel is the pulley and this pulley always has a road pass that usually goes through the wheel. 00:00:32
In a simple play, it's always a dynamic equilibrium, which is that the addiction of the force is 00:01:03
0 and the addiction of revolution is always 0 too. So the speed of movement is always the same. If you see in this 00:01:38
draw we are where we we calculate the addiction of the forces and on the left 00:02:01
there is always there's there's only two forces the the action forces of the the 00:02:17
loss of the object and the stress of the rope and in the other hand on the right 00:02:29
is always two forces that are the power of the force you have to do and the 00:02:37
stress. If the rope is the same, the stress is the same. So the action and the 00:02:48
power are the same because both of them are are the same of the stress of the rock we are we we 00:02:58
could do the calculate using the revolutions. On the right hand there is a revolution that 00:03:13
make they will and go to the to the left and it is expressed the the the the multiplication of 00:03:36
stress and the radius of the wheel. And the other hand, on the left, the 00:04:05
multiplication between the power and the radius makes the wheel to go to the 00:04:18
right. So if both of them are the same and the wheel is the same too, so the radius is the same, 00:04:34
actions and power have to be the same too. So, in conclusion, in all the Texas pulleys, 00:04:49
the power is the same to the action but sometimes we use more than one play we can't use mobile 00:05:07
plays and in this row you can see how it works and there is to play a fixed play 00:05:37
we have already study and and the other one is the mobile play in a mobile play 00:05:50
the actions is the same that to stress because it is holding by two two ropes I 00:06:03
mean there are not two ropes in the same row but there are a two pieces of this 00:06:23
rope. So the action is two stresses. In the fixed play the power is one stress and the rope is the 00:06:30
same. So the power I have to do is the half of the action. We can ejections more 00:06:45
than one mobile play a depends on how are they connected we can we can 00:07:06
construction and different kinds of hoist. In this picture you can see two 00:07:25
that are very important. In the first one the rope is not the same and as you can 00:07:36
see you you you are helping the addiction and in the second one and you 00:07:44
just only and are the are dividing the the addictions into a different number 00:08:00
bars of rope. These different kinds of holes have many importance because it helps us to 00:08:17
blows, very big blows, and we have just only to do less force. 00:08:38
Idioma/s:
en
Autor/es:
Isabel Lafuente Reboredo
Subido por:
Isabel L.
Licencia:
Reconocimiento - No comercial
Visualizaciones:
156
Fecha:
28 de enero de 2020 - 18:49
Visibilidad:
Público
Centro:
IES JOSÉ GARCÍA NIETO
Duración:
08′ 59″
Relación de aspecto:
1.78:1
Resolución:
854x480 píxeles
Tamaño:
23.15 MBytes

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