Question Video: Identifying Direction of Flow in Steady Flow | Nagwa Question Video: Identifying Direction of Flow in Steady Flow | Nagwa

# Question Video: Identifying Direction of Flow in Steady Flow Physics • Second Year of Secondary School

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Fill in the blank. Where a fluid flows steadily, the direction of flow can change within ＿ of the regions of the fluid.

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### Video Transcript

Fill in the blank. Where a fluid flows steadily, the direction of flow can change within blank of the regions of the fluid. (A) None, (B) only some, or (C) all.

In this question, we are asked to fill in the blank in order to make this statement true. We need to figure out the regions in which the direction of a steady flow can change. Before we can work out what should go in the blank, let’s remind ourselves of some information about the flow of fluids and the difference between the types of flows.

Fluids are made up of many particles that are not bound together. Because there are so many particles in a fluid, it’s much easier to think about fluids in terms of their overall flow. Recall that turbulent flow is defined as a flow where the particles in the fluid are changing direction and/or speed rapidly. On the other hand, steady flow is defined as a flow where the particles in the fluid are not changing speed or direction as often. And all have similar speeds and directions to each other. Turbulence can be caused by something blocking an area in the space the fluid is flowing in, like seen here. When a fluid is flowing steadily, it is free to move in the same direction with the same speed uninterrupted, like seen here.

Going back to the question, we are trying to figure out whether the direction of flow can change in any region of a steady fluid. If we look at the diagram we have made for a fluid flowing steadily, we can see that the direction of flow is able to change freely. Initially, the flow is horizontal. The direction of flow then changes, so the fluid is moving at a steeper angle. Then, the direction of flow changes again, once more becoming horizontal.

Looking at the options we are given to fill the blank in, we found no restrictions on where the direction of flow can change, which means options none and only some cannot be the right answer. Those answers would mean that the flow is restricted from changing in some or all areas. And there is no reason why this would be the case. So, the direction of flow must be free to change in all regions of the fluid.

So option (C), all, is the correct answer. And our final statement reads “Where a fluid flows steadily, the direction of flow can change within all of the regions of the fluid.”

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