Uncovering the Mystery of Deeper Footprints in the Sand: East vs. West

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Discussion Overview

The discussion centers around the claim that walking towards the West in a sandy desert results in deeper footprints on average compared to walking towards the East. Participants explore the potential reasons behind this phenomenon, including the effects of the Earth's rotation and curvature.

Discussion Character

  • Debate/contested
  • Conceptual clarification
  • Technical explanation

Main Points Raised

  • Some participants question the validity of the claim regarding deeper footprints, expressing skepticism about the reasons behind it.
  • One participant suggests that the accuracy of measuring footprint depth is limited by the non-uniformity of the sand surface and other environmental factors.
  • Another participant introduces the concept of non-inertial frames due to the Earth's rotation, mentioning the Coriolis and centrifugal effects as relevant factors.
  • It is noted that any potential difference in effective weight when traveling east or west would be negligible, particularly at the equator.

Areas of Agreement / Disagreement

Participants generally do not agree on the validity of the original claim, with some expressing skepticism and others providing technical explanations that suggest any effects would be minimal or unmeasurable.

Contextual Notes

Limitations include the potential inaccuracies in measuring footprint depth and the influence of various environmental factors that may overshadow the effects of the Earth's rotation.

Baluncore
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Is it true, that when you walk towards the West through a sandy desert, your footprints are deeper on average than when you walk towards the East.
 
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Baluncore said:
Is it true, that when you walk towards the West through a sandy desert, your footprints are deeper on average than when you walk towards the East.

I can't imagine why they would be? Where did you hear this?
 
Probably not to the accuracy that you can measure the depth of footprints in sand whose surface does not conform to the average curvature of the Earth anyway.

Similarly - water does not spiral a different way down the plughole in the north and south latitudes.. simply because there are so many different things that have a bigger contribution to the phenomena.

However, what you are talking about is the effect of being in a non-inertial frame: the Earth is spinning.
When you travel at a constant speed around the Earth, too, you are slightly changing direction according to the curvature of the Earth.

You want to look up the coriolis and centrifugal effects.
 
What simon bridge said, about the centrifugal effect. (I don't think the coriolis effect would make any difference to the question).

But it would be unmeasurably small. If you were traveling along the equator at about 1000 miles/hour, your effective weight would change by less than 1% depending whether you were going east or west.
 

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