Free fall and impact force calculation

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Discussion Overview

The discussion revolves around calculating the impact force on screws when a box is dropped from a height. Participants explore the implications of free fall, impact force calculations, and the effects of different screw configurations on the impact force experienced by the screws. The context includes theoretical considerations and practical applications related to mechanics and material properties.

Discussion Character

  • Technical explanation
  • Mathematical reasoning
  • Experimental/applied

Main Points Raised

  • One participant describes a scenario involving a 27-pound box dropped from 5 feet and seeks to calculate the impact force on 16 screws.
  • Another participant notes that the impact force cannot be determined without knowing properties of both the falling object and the surface it impacts, emphasizing the importance of impact duration.
  • A participant inquires about incorporating information regarding impact duration into their calculations if such data can be obtained.
  • A further contribution details the configuration of screws and brackets, suggesting a comparison between using 16 screws versus 24 screws, and discusses the need to calculate the impact force transferred to the screws and its relation to shear modulus.

Areas of Agreement / Disagreement

Participants do not reach a consensus on how to calculate the impact force, as there are multiple considerations and variables that remain unresolved, including the properties of the impact surface and the duration of the impact.

Contextual Notes

Limitations include the lack of specific information about the impact surface properties and the time duration of the impact, which are critical for accurately determining the impact force.

bama ing
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first of all I have a case that is screwed in another case ,I like to know a basic way to calculate the impact force in the screws ,the are 16 screws, I try using the basic impact force formula and the conservation of energy in the free fall,but I am having problems since I don't have the D which apparently its the distance after the impact.The weigh of the box is 27 lbs and its throwed from 5 ft.
 
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It's impossible to know what the impact force is going to be without knowing some properties of the falling object and the surface they are hitting.

The force will depend on the amount of time the impact takes. With softer surface, impact will take longer, and forces will be lower.
 
thnax,can i incorporate that information to the formula,I mean if I findt hat kind of info
 
Impact force

I have a 27 pound box attached to a another box by 16 screws in 4 brackets one for every corner,I like to compare the effect of the impact if I put 16 screws or if I put 24(like the number of holes in the bracket).It would be dropped from 5 ft to a concrete slab,the material of the outside box its a TSC composite material.So I think what I need its the impact force that will received the box and that will tranfer to the screws,after that I can divided by the section area of the screws and compare that to the shear modulus,but I am not sure.
 

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