Can a Bird Fly Horizontally in a Cage With Downward Acceleration?

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Homework Help Overview

The discussion revolves around the possibility of a bird maintaining a constant horizontal velocity while experiencing a downward acceleration within a cage. The subject area includes concepts from physics related to forces, motion, and acceleration.

Discussion Character

  • Mixed

Approaches and Questions Raised

  • Participants explore the implications of downward acceleration on horizontal motion, with some arguing that constant horizontal velocity is not achievable under these conditions. Others suggest that the forces acting on a bird in flight, such as lift and thrust, could allow for horizontal movement despite the downward acceleration.

Discussion Status

The discussion is active, with various interpretations being explored. Some participants provide reasoning based on force diagrams, while others question the feasibility of horizontal flight in a confined space. There is no explicit consensus, but several productive lines of reasoning have emerged.

Contextual Notes

Participants note the constraints of the problem, including the cage's role and the effects of free fall on the scenario. The discussion acknowledges that certain assumptions, such as the nature of the forces involved, are under examination.

srikanth.isro
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Homework Statement



Is it possible for a bird to fly in a cage with a constant horizontal velocity when there is an acceleration acting in the vertically downward direction.

Homework Equations





The Attempt at a Solution

 
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whats your best guess?
 
i think that there can't be a motion in the horizontal direction with constant velocity when there is an acceleration in the downward direction. If the bird flies at an angle then the vertical component of the force will be compensated by mg and still there will be a net horizontal component of the force, so the bird can't move with constant velocity
 
well if we take the cage out of the problem, i would argue that any bird can do exactly what you say it can't--well maybe not do-do birds or ostriches. Birds in flight are subject to 4 forces, a constant acceleration downward, lift, drag, and thrust. If lift = mg, and thrust = drag, you have constant horizontal flight. I'm not trying to make the question seem foolish as I suspect there is more to it yet.
 
I agree with your argument. can you show with a free body diagram how these four forces act on the bird.
 
sure its not as straight forward for a bird as a plane, but mg acts downward thru the center of gravity, lift upwards thru the center of pressure, drag is slowing the horizontal velocity, and thrust (this is tricky) since it is also generated by wings in a rowing kind of motion provides force horizontally.
 
i think it's not possible in long run. assume the bird flies in a cage with a constant horizontal velocity, then after a while it will hit the grate and therefor change its horizontal velocity to zero. hence, in order for horizontal velocity to be constant it has to be zero all the time, but with zero horizontal velocity it is impossible to fly (unless there is an acceleration acting in the vertically upward direction cancelling bird's weight, which goes against the problem statement). so no, it's not possible.
 
oh crap I haven't thought about http://www.radio.usp.br/imagens/bdb_colibri.jpg :(
 
Last edited by a moderator:
well the obvious downer for all scenarios is that the cage is in free fall.
 

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