Help with putting a box on a shelf (gravity?)

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    Box Gravity
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Discussion Overview

The discussion revolves around the problem of safely placing a custom-sized card box on a shelf, particularly focusing on the effects of gravity and the distribution of weight. Participants explore the necessary surface area of the box that must be in contact with the shelf to prevent it from falling, as well as considerations for securing the box.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • One participant inquires about the percentage of the box's surface area that needs to be on the shelf to ensure stability, given that the box is larger than the shelf.
  • Another participant suggests drawing a diagram to visualize the situation, emphasizing the importance of the center of mass and how it relates to the edge of the shelf.
  • A different participant warns that assuming even weight distribution is risky and recommends making the box match the shelf size for better stability.
  • Some participants propose using a thin rope to secure the box to the shelf as a precautionary measure against it falling.

Areas of Agreement / Disagreement

Participants express disagreement regarding the assumption of even weight distribution, with some advocating for a box size that matches the shelf. There is no consensus on the optimal solution for securing the box.

Contextual Notes

Participants highlight the need for a diagram and experimentation to assess the stability of the box, indicating that the discussion may depend on specific conditions such as the box's weight distribution and dimensions.

asdfroy
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i am making a custom size card box filled with stuff that i want to put on top of a shelf (the box is bigger than the shelf), assuming the weight of the object is distributed evenly in the card box, what percentage of the box surface area (bottom of the box) that i need to have on the surface of the shelf, and the percentage that i can have floating by the edge of the shelf for the card box to not fall down.

thx
 
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Welcome to PF;
The lynchpin here is to draw a diagram of the situation ... gravity acts downwards from the center of mass, so what happens if the line directly down from the center of mass of the box goes over the edge of the shelf? Compare with when it doesn't...
You can even get a small box and experiment.

After that you just need some assessment of how much disturbance the box is going to need to take.
 
asdfroy said:
assuming the weight of the object is distributed evenly
This is a dangerous assumption. I would make the box match the size of the shelf.
 
Dale said:
This is a dangerous assumption. I would make the box match the size of the shelf.
Agreed. At the very least, I would use a thin rope to secure the box once it is on the shelf. Kind of like a variation of the securing bands in this picture:

https://s-media-cache-ak0.pinimg.com/736x/1c/16/70/1c1670afb724c26972c41df3334fe0e9.jpg
1c1670afb724c26972c41df3334fe0e9.jpg
 

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