Static Vs. Dynamic Load

A better version of this demonstration can be found at:

Illustrating the difference between a static load (such as the weight of the floors above a certain point in a building), and the a dynamic load (such as those floors falling a few feet).

[tankolad]

I find it morbidly ironic that while this video has the intention of educating people who do not understand the concept of dynamic loads, these people comment on the "cowardlyness" of using cardboard to support the dumbell instead and choose to completely ignore the physics concept it is meant to illustrate. What a world we live in...

[Jashtvorak]

And there are still people that can say that this does not represent WTC, because it is cartboard. Well, this an illustration how much different static and dynamic loads are. What can dynamic load do to a structure that can support the same weight in static load.

[Scudmaster]

here is the thing when building a place you would do mostly static becuase it needs to hold its own weight and not that object coming in at high speed

[ammonammonammon]

Do you think the WTC building were designed to be on the verger of crumbling like this box under that weight? If this box was more of an adequate support structure it would be more obvious to the casual observer that the box actually does resist the weight. As the box resists the weight, the weight absorbs energy returned to it via the box.

You take a mass like the upper 20% of the WTC1 and let it sink the ca. 12' to the structure below it's weight magnifies tremendously upon impact. Where does the force of this impact go? Downward, into the remaining 80% AND and equal and opposite impact will go upward into that 20% portion.

So, hammers on a wine glass - steel weight on boxes, both pretty inadequate in explaining where energy is transmitted in a static OR dynamic load. They are fun experiments because they show the extreme difference between 1kg static becoming 98, 000N after a relatively short fall - but that's it.

[YeetusEliteus]

lol thanks for the quick tip Epoxynous

[Denierbud]

Equal and opposite reactions do not mean that the actions cancel each other out -- truthers have been getting physics wrong for years

[MaddoxElliott]

this did not help because im just learning

[fizywig]

If the top 30 stories of a 100 story building collapse its load kinetically on the 70 floors below, then according to newton's law (every action has an equal and opposite reaction) as each of the 70 floors disntegrate due to this fall, then each of the 30 floors will also progressively disintegrate as they hit each floor. I.E. the fall/collapse will rapidly slow down as the mass above is being reduced from the impact below. Therefore the example shown here is a poor model of a building collapse

[dennisgradisar]

This is the stupidest thing I've seen in a while. First you would have to drop cardboard on cardboard or steel on steel. This is like going into a nursery and beating the shit out of a sleeping baby, and then bragging about how fair  the match was. Secondly, did something lift the top of the building 500 or 600 feet off the rest of the building and then drop it?

[mikerevs]

If it is real dont be lazy.
Try wood next then plastic etc.
The choice of -toilet roll- cardboard looks cowardly.