# Why does a stream change trajectory?

• Bboy Physics
In summary, during a conversation about how astronauts go to the bathroom in space, it was mentioned that the trajectory of the waste bag being shot into outer space would change, due to a force called the reaction force. This force is a result of Newton's third law or the conservation of momentum.
Bboy Physics
Okay bear with me here because this might get disgusting. But I was watching Henry's video on how astronauts went to the bathroom in space, and basically they did it in a bag, and shot the bag outside into outerspace. And then he mentioned that the trajectory would change(but extremely small yet significant enough to tell Hudson Control when you're flying to the moon). I realize that streams change trajectory(comedy in firing an extremely high powered hose), but what is this force called?

You could call it the reaction (force). It is a consequence of Newton's third law, or, in a more modern perspective, of conservation of momentum.

## 1. Why do streams change trajectory?

Streams change trajectory due to natural processes such as erosion, sedimentation, and changes in water flow. These factors can cause the stream channel to shift and change direction over time.

## 2. Can human activities impact stream trajectory?

Yes, human activities such as land development, deforestation, and construction of dams or levees can alter the natural flow of streams and cause changes in their trajectory. This can lead to increased erosion and sedimentation, which can further impact the stream's direction.

## 3. How long does it take for a stream to change its trajectory?

The time it takes for a stream to change its trajectory varies depending on the specific environmental conditions and factors at play. In some cases, it can happen relatively quickly, while in others it may take many years or even decades.

## 4. What are the potential consequences of a stream changing trajectory?

Stream changes in trajectory can have various consequences. It can impact the surrounding landscape, alter the habitat for plants and animals, and cause changes in water quality. It can also lead to flooding and erosion, which can damage infrastructure and property.

## 5. Is it possible to prevent or control stream trajectory changes?

While it may not be possible to completely prevent stream trajectory changes, there are measures that can be taken to minimize their impact. These include sustainable land management practices, avoiding construction in flood-prone areas, and implementing erosion control measures.

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