256bits said:Gravity pulls down on all parts of the feather, making the edges droop. Release the feather in a vacuum and the stresses become zero. Plus it takes some time for the ends of the feather to become unstressed. That is what you see in a vacuum.
Imagine hooking a mass to a spring and hanging it. The spring will be extended. Release the spring and there will be a time lag before the mass begins moving, and only when all of the spring has become un-extended.
The cause of feather movement in the documentary is most likely due to air currents or wind. Feathers are very light and can easily be moved by even the slightest breeze.
Yes, other factors such as vibrations, physical contact, and even body heat can also cause feather movement. In the documentary, the feathers may have been moved by the movement of the bird or by the person filming.
Yes, there have been numerous studies on feather movement in various settings, including documentaries. Scientists use high-speed cameras and other tools to analyze the movement of feathers and understand the underlying causes.
Feather movement can provide valuable information about the air currents and other environmental factors in a particular setting. By studying feather movement, scientists can gain insights into the climate, wind patterns, and other environmental conditions in a documentary.
Feather movement in documentaries can be both natural and manipulated. In some cases, filmmakers may use artificial wind or other techniques to create a desired effect. However, in documentaries that aim to capture natural behavior, feather movement is typically the result of natural factors.