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2
votes
1answer
49 views

Is there a name for this phenomenon?

Imagine I have a cylindrical pipe closed on both ends with lids. I fill it with sand and compress the sand tightly. Now I hold the cylinder vertically and remove the bottom lid. The sand will counter ...
0
votes
1answer
1k views

What is the difference between Quasi static and Dynamic simulation?

I'm a newbie in Physics, I read some papers in bio-mechanical that model human joint motion, some of them are modeled using Dynamic, while others using Quasi static. All I know so far is that in Quasi ...
-2
votes
1answer
148 views

Differences between these four branches of physics

I am wondering what are the main differences between these four branches of physics: Statics, Kinematics, Dynamics, and Kinetics? And whether the following relationships are correct or not? Statics: ...
-1
votes
1answer
56 views

What does $\bar{x}_{\textrm{el}}$ represent?

In the context of centroids and moments, what do $\bar{x}_{\textrm{el}}$ and $\bar{y}_{\textrm{el}}$ represent? For example: $$\bar{x}L = \int \bar{x}_{\textrm{el}}dL$$ Some references that use ...
3
votes
3answers
333 views

What is a “Center Of Mass” issue of a Gorillapod?

I read somewhere that a Gorillapod may have "Center Of Mass" issues when used with the long lenses. So, I wish to understand what is a "Center Of Mass" issue? I have to clarify that I am NOT a ...