Why Does Deep Water Reduce Foot Pain from Rocks?

In summary: But if you were to walk out onto the stream's surface, the increased air pressure would cause you to feel more pressure on your feet. This has to do with the fact that when a fluid is displaced, the pressure of the displaced fluid is greater than the pressure of the surrounding fluid.
  • #1
jimbo71
81
0

Homework Statement


If you have ever had to wade across a rocky creek while hiking in the mountains, you have probably noticed that by the time you get to the deep water in the center of the creek rocks don't seem to hurt your bare feet as much. what is the reason for this?
a. one tend to stand on tiptoe in deep water, thereby reducing the area of the foot in contact with the rocks
b. the greater pressure on one's feet in deep water means the rocks cannot dig in so much
c. deeper water is colder, and hence more dense, than shallow water
d. one experience a greater bouyant foce in deeper water
e. the velocity of the water is less in deep region than in shallow regions


Homework Equations





The Attempt at a Solution


I think the corect selection is either choice B or D. I am leaning towards B because I think the bouyant force is the same no matter how deep the water is.
 
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  • #2
Consider a force diagram at the point of a rock under your foot that you may be standing on.

What determines the maximum pressure on your skin at the point of the rock touching your skin? Assuming the same rock and hence the same area of application why might the pressure at the point be less in deeper water?
 
  • #3
The force determines the decrease or increase in pressure assuming area is the same. So in deep water there must be something that lowers the force and ultimately the pressure felt by ones foot? would that something be bouyant force?
 
  • #4
Isn't that what a bouyant force does?
 
  • #5
I thought bouyant force was more a function of the density of the liquid and the bouyant force was the same at all depths given uniform density of a liquid. Why does the bouyant force vary at different depths?
 
  • #6
Buoyant force varies with displacement.

Remember Archimedes in his tub?
 
  • #7
jimbo71 said:
I thought bouyant force was more a function of the density of the liquid and the bouyant force was the same at all depths given uniform density of a liquid. Why does the bouyant force vary at different depths?
As lowly_pion points out, if you were immersed up to your neck in the stream, bouyancy would be such that you would feel very little pressure on your feet. :wink:
 

FAQ: Why Does Deep Water Reduce Foot Pain from Rocks?

1. Why does deep water reduce foot pain from rocks?

Deep water reduces foot pain from rocks because the buoyancy of water supports the weight of the body, reducing the pressure on the feet. This reduces the impact of walking on hard surfaces, such as rocks, and decreases the amount of strain and stress on the feet.

2. How does the depth of the water affect foot pain from rocks?

The deeper the water, the more buoyancy it provides, resulting in greater support for the body and less impact on the feet. The deeper the water, the more weight is lifted off the feet, reducing the pressure on them and decreasing foot pain from rocks.

3. Is there a specific depth of water that is most effective for reducing foot pain from rocks?

The depth of water that is most effective for reducing foot pain from rocks will vary depending on the individual. Generally, a depth of at least waist-height or deeper is recommended for maximum support and buoyancy. However, it is important to listen to your own body and adjust the depth as needed for your comfort.

4. Can deep water exercise help prevent foot pain from rocks?

Yes, deep water exercise can help prevent foot pain from rocks. The buoyancy of water reduces the impact on the feet and strengthens the muscles in the legs and feet, providing better support for walking on rocky surfaces. Additionally, the resistance of water can improve balance and stability, reducing the risk of injury from uneven terrain.

5. Are there any other benefits of using deep water to reduce foot pain from rocks?

Aside from reducing foot pain from rocks, using deep water can also provide other benefits such as improving circulation and reducing swelling in the feet and ankles. It can also be a low-impact form of exercise, making it a great option for those with joint pain or injuries. Additionally, being in the water can have a calming and therapeutic effect on the body and mind.

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