Falling objects?

Why does a shuttle cock fall to the ground heavy side first if there was no gravity?

Magic?  I'd like to know why too.

Center of mass and air resistance.

Center of mass and air resistance.

Center of mass? But if there is no gravity, mass would b irravelent. Everything would weigh the same?

Air resistance would slow it down. but then it would just stop and then the earth would rush to meet. but it turns heavy side down because of gravity??

It turns due to the torque imposed about its center of mass due to air resistance being higher on the skirt than the cork.

It turns due to the torque imposed about its center of mass due to air resistance being higher on the skirt than the cork.

And this would be true in all directions?

It turns due to the torque imposed about its center of mass due to air resistance being higher on the skirt than the cork.

Where creates torque from the center of mass? That almost suggesting it creates its own engergy?

Quote from: "TheEngineer"

It turns due to the torque imposed about its center of mass due to air resistance being higher on the skirt than the cork.

Where creates torque from the center of mass? That almost suggesting it creates its own engergy?

What?  

The torque is created due to the coefficient of drag being higher for the skirt than the cork.  This means there is a greater drag force on the skirt, which is further away from the center of mass of the shuttle, than there is on the cork, which is closer to the CoM.  This uneven force creates the rotation.

Quote from: "edlloyd"

Quote from: "TheEngineer"

It turns due to the torque imposed about its center of mass due to air resistance being higher on the skirt than the cork.

Where creates torque from the center of mass? That almost suggesting it creates its own engergy?

What?  

The torque is created due to the coefficient of drag being higher for the skirt than the cork.  This means there is a greater drag force on the skirt, which is further away from the center of mass of the shuttle, than there is on the cork, which is closer to the CoM.  This uneven force creates the rotation.

But torque is a twisting force. You dont see shuttle cocks twist when the fall though.

They will until they are falling cork first.   :roll:

They will until they are falling cork first.   :roll:

How? A human falling doesnt rotate as he is falling? :roll:

He will if his drag force is not even on his body.

He will if his drag force is not even on his body.

Ur missing the point.

At the point a shuttle cocks, stops is because against air resistance it no longer has the the momentum to keep travelling up. I mean litterally straight up when i talk up. Point away from the earth..

So if it loses momentum, it will stay in the same position in space, because according to u, gravity is not there to act on (pull it back down against/through air). So why does it not stay in the same position met be earth?

Quote from: "TheEngineer"

He will if his drag force is not even on his body.

Ur missing the point.

At the point a shuttle cocks, stops is because against air resistance it no longer has the the momentum to keep travelling up. I mean litterally straight up when i talk up. Point away from the earth..

So if it loses momentum, it will stay in the same position in space, because according to u, gravity is not there to act on (pull it back down against/through air). So why does it not stay in the same position met be earth?

Now you are asking a different question.

The shuttle accelerates to a certain speed as it is hit.  Afterwards, it continues at a constant velocity, until the earth accelerates and catches up with it.  So in a way, what you said is exactly what happens.

Quote from: "edlloyd"

Quote from: "TheEngineer"

He will if his drag force is not even on his body.

Ur missing the point.

At the point a shuttle cocks, stops is because against air resistance it no longer has the the momentum to keep travelling up. I mean litterally straight up when i talk up. Point away from the earth..

So if it loses momentum, it will stay in the same position in space, because according to u, gravity is not there to act on (pull it back down against/through air). So why does it not stay in the same position met be earth?

Now you are asking a different question.

The shuttle accelerates to a certain speed as it is hit.  Afterwards, it continues at a constant velocity, until the earth accelerates and catches up with it.  So in a way, what you said is exactly what happens.

Well I'm not asking a different question. Why does a shuttle rotate to then hit the ground if air just stops it and then it makes contact with the ground  cos earth moves towards it?

Well I'm not asking a different question. Why does a shuttle rotate to then hit the ground if air just stops it and then it makes contact with the ground  cos earth moves towards it?

The air does not stop it.  It continues at a constant velocity.  As the earth accelerates, it also accelerates the air, creating the air resistance the shuttle feels.  This creates a torque that rotates the shuttle 'cork down' as the earth rushes up to it.

Quote from: "edlloyd"

Well I'm not asking a different question. Why does a shuttle rotate to then hit the ground if air just stops it and then it makes contact with the ground  cos earth moves towards it?

The air does not stop it.  It continues at a constant velocity.  As the earth accelerates, it also accelerates the air, creating the air resistance the shuttle feels.  This creates a torque that rotates the shuttle 'cork down' as the earth rushes up to it.

Torque? Why does the shuttle cock not rotate as it falls then?

No, the shuttle cock would just and then be met by the earth. Air resistance would not make it rotate to fall down, upside unless something pulled it down.

Torque? Why does the shuttle cock not rotate as it falls then?

It does.  When the shuttle is not vertical, there is an uneven torque about the center of mass, which rotates it until the forces on each side of the center of mass is in equilibrium.

Quote from: "edlloyd"

Torque? Why does the shuttle cock not rotate as it falls then?

It does.  When the shuttle is not vertical, there is an uneven torque about the center of mass, which rotates it until the forces on each side of the center of mass is in equilibrium.

Rotates it just once?

It rotates it until it is in equilibrium.

It rotates it until it is in equilibrium.

Sorry, arguing from the point of if one just dropped it or if one shot it up straight up into the air?

Either way, it's the same thing

What would happen if shuttlecocks were thrown in a perfect vacuum?

To the pro-gravity, pro-round earth people, it would go up cork first, turn around and fall cork first.

To the flat earth people, it would go up until it hits a constant velocity, then the earth will move up to it. But what of the position of the cork? Without air resistance, the shuttlecock will not fall cork first if that were not its initial orientation. Which leads me to my next point.

A hypothesis: create a chamber in which to drop a shuttlecock through that is as close to a perfect vacuum as possible with the shuttlecock attached sideways at the top. On signal, release the shuttlecock from rest and observe its movement. If it rotates till it falls cork first, then earth exhibits gravity rather than accelerating up. If it continues to fall sideways instead, then the earth is accelerating upward towards the shuttlecock and earth does not have gravity.

Recap:
Outcome 1-Shuttlecock falls cork first in vacuum, earth gravity is true.
Outcome 2-Shuttlecock falls sideways in vacuum, earth accelerating up is true.

Since I am a round earth supporter, if I did the experiment, you might say it is biased, say I rigged it, and dismiss the results. So how about one of you flat earth people do it instead?

In the absence of air, the shuttle will not fall cork first in a gravitational field.

In the absence of air, the shuttle will not fall cork first in a gravitational field.

but a shutteke does not a fall...its met by the earth?? remember?

Quote from: "TheEngineer"

In the absence of air, the shuttle will not fall cork first in a gravitational field.

but a shutteke does not a fall...its met by the earth?? remember?

TheEngineer is an aircraft pilot and holds a degree in Engineering. I think you should just take his word for it.

Quote from: "TheEngineer"

In the absence of air, the shuttle will not fall cork first in a gravitational field.

but a shutteke does not a fall...its met by the earth?? remember?

Yes.  What's your point?