Hourglass on Moon: Flow Speed Compared to Earth

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In summary: So, if the hourglass is timed by the number of grains that pass through the orifice in a minute, then the hourglass on the Moon would flow slower due to the lower gravity.
  • #1
bobnstar
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Will a sand-filled hourglass flow faster, slower, or the same on the moon as it does here on earth?
 
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  • #2
welcome to PF.
What do you think, are things heavier on the moon, do they fall faster or slower?
 
  • #3
Thank you for the reply, and the well wishes. I was thinking that the hourglass is timed by grains of sand passing through a narrow orifice, and only the grain passing through the orifice is in free fall. I thought that perhaps granular flow, and whether the reduced gravity might reduce the compaction of the sand which would allow a faster flow toward the orifice. We may just have to go up there and find out. Thanks.
 
  • #4
I think you can consider an hourglass as just objects in free fall.
 
  • #5
mgb_phys said:
welcome to PF.
What do you think, are things heavier on the moon, do they fall faster or slower?

Doesn't it also depend on how fine grained the sand is, and also the radius of the middle portion of the hour glass too?
I think the slower-hour-glass-in-moon is true only if the sand is freely falling. Here it's controlled. It would be slower - but how slow would depend on the physical properties of the sand and the hour glass.

When do you completely measure one hour? - when the top portion is empty, or when the bottom portion is full?

Thanks,
Joby
 
  • #6
jobyts said:
Doesn't it also depend on how fine grained the sand is, and also the radius of the middle portion of the hour glass too?

It shouldn't, given that these properties remain constant. Since the OP said "an hourglass," we can assume the same hourglass on both the Earth and Moon. Since the change in gravity does not effect the size of the grains or the radius of the chokepoint, only the change in rate of fall should matter.
 

Related to Hourglass on Moon: Flow Speed Compared to Earth

1. How does the flow speed on the moon compare to that on Earth?

The flow speed on the moon is significantly slower than on Earth. This is due to the moon's lower gravity and lack of atmosphere, which results in weaker forces acting on the particles in its flow.

2. What causes the flow to be slower on the moon?

The slower flow speed on the moon is primarily caused by its lower gravity. This means that there is less force pulling the particles towards the surface, resulting in a weaker flow.

3. Is the flow on the moon affected by the presence of an hourglass?

Yes, the presence of an hourglass on the moon can affect the flow speed. The shape of the hourglass can create different flow patterns and alter the flow speed in certain areas.

4. How does the flow on the moon affect the hourglass?

The flow on the moon can affect the hourglass by causing particles to accumulate at different levels within the hourglass. This can alter the appearance of the hourglass and impact its functionality.

5. Are there any other factors that influence the flow speed on the moon?

Aside from gravity and the presence of an hourglass, the flow speed on the moon can also be influenced by the shape and composition of the surface, as well as the angle of the moon's axis and its distance from the sun.

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