why can birds fly and we cant?????????????

Question

how come gravity doesnt pull birds down but pulls us down?????

Answer 1

Well, gravity does indeed pull birds down, as can be quickly demonstrated with a shotgun, though I hope you won't choose to actually cary out the experiment.
Birds and planes fly by exerting a downward force equal to or greater than the force of gravity acting on them. They do so by directing a downward jet of air from their wings, and also by being lofted by a vacuum created above their wings.

Answer 2

Gravity pulls all things in the universe. Birds overcome this with several methods.

One: A birds wing has greater surface area on top than on bottom. this creates lower air pressure on top than on bottom and thus creates lift. Gravity still pulls down on the birds and eventually they need to flap or find and uprising air currant to stay aloft.

Two: Birds flap thier wings. The large surface area of the wing pushes air down and pushes the bird up. This helps the bird maintain or gain altitude between glides.

Three: Birds long bones (legs and wing bones) are hollow; kind of. The are hollow but they have small supports inside to keep them from being to brittle. these "hollow" bones are much much lighter than a traditional bone, so the bird does not tire as easily.
A light bird can ride the wind easier. a typical Chickadee weighs less than a quarter.

Answer 3

Gravity pulls all objects downward at the same rate. Birds have less weight, lighter bones, and have wings. When birds fly, the wings direct the air in such a way that they are pushed upward, countering the effects of gravity. We can't fly because we are too heavy, our arms are not good at catching air, and we weren't built for flying.

Answer 4

Gravity does pull on birds like it does us. Only problem is that we dont have wings. The only way that we can fly is in an airplane or helicopter. The only reason being that the wings create lift and therefore we fly.

Answer 5

my what an interesting question, now let me enlighten you ; first of all birds were evolved so that they can fly this took many years, but saying that is not compleatly true either as there are birds that cannot fly, they like us are grounded for life.
now if you want to fly you can either buy a ticket and fly in a plane or if you are true good and god decides you deserve to fly he will give you wings but you need to be a real angel first

Answer 6

I think the sky would be a bit crowded if EVERYTHING could fly. The other things is we don't have wings, which is what helps birds fly. If you notice, when they come in to land, they don't go floating off again, they have to flap their wings to gain height.

Answer 7

Birds have wings that 'lift' them up
They have super light bones ans there is no or little bone marrow that proves useful as after they get the initial lift off, wind [or air pressure] makes them airborne for good
they also have an aerodynamically modified body structure
So they fly...and we don't because we don't have wings and we are super heavy and our bodies are best left undescribed!

hope that answers your question

Answer 8

Gravity does pull them down.
They use muscles and aerodynamics (the laws of physics) to over come the forces of gravity while flying.

Answer 9

Birds have hollow bones in their wings which makes them able to fly. Also the stream line of their bodies make it possible to fly.

Answer 10

birds have less food in them or substances that will pull them down. they also have wings that defy gravity so that's why they can fly and we can't.