How Birds Fly: Physics Explained

  • Context: High School 
  • Thread starter Thread starter karim102
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Discussion Overview

The discussion centers around the physics of bird flight, specifically the forces that enable birds to fly. Participants explore concepts related to lift generation, wing mechanics, and energy conservation during flight, including both flapping and gliding behaviors.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification

Main Points Raised

  • One participant inquires about the specific forces affecting bird flight, seeking a physics-based explanation.
  • Another participant critiques a referenced article for relying on the hump theory, suggesting that lift is generated by accelerating air downwards and creating pressure differentials on the wing.
  • The same participant notes that birds can flap their wings for downforce or glide, and shares personal observations about birds using thermals to conserve energy during flight.
  • There is a mention of birds utilizing updrafts for playful diving and gliding, indicating varied flight behaviors.

Areas of Agreement / Disagreement

The discussion includes multiple viewpoints regarding the mechanics of bird flight, with no consensus reached on the best explanation or model for how birds generate lift and utilize thermals.

Contextual Notes

Some assumptions about the mechanics of lift and the conditions under which birds fly are not fully explored, and the discussion relies on anecdotal evidence from personal experiences with bird flight.

karim102
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Hi Room:!) ,
How are you?
My question is about "How can bird fly?" I want to exactly explain it, by
way in physic. what are the forces which effect the bird?
Thanks
I appreciate it:biggrin: .
Sincere
Karim:rolleyes:
 
Physics news on Phys.org
The first link from above still refers to the hump theory where the air has to travel faster over the top than the bottom. It travels faster simply because it's being drawn towards a low pressure area created by the wing.

Lift is generated by accelerating air downwards, via the force = mass times acceleration. Coinciding with this downwards acceleration of air will be pressure diffentials on the wing. A bird can flap it's wings to generate downforce, like a hummingbird, or it can glide like a pelican.

The article also mentions that birds don't fly higher than needed, but doesn't mention the fact that birds will use thermals to save energy. I fly radio control gliders and quite often share thermals with birds. Predator birds will only thermal up to the point where they can barely see their prey. Here in southern California, the local seagulls will thermal the highest, going into the clouds, since their intent is to get as much out of a thermal as possible before gliding onwards to another location.

At some slope sites, where there is an updraft of air, you will find some birds diving downwards, and gliding back upwards in the updraft, apparently just for fun.
 
Hi,
I am so sorry man, I don't know that but now I know everything about your froum, I believe your froum is amazing. I really happy to be here.
I appreciate it.
Thanks
 

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