Science Something amazing to tell you concerning physics and motion - Page 8

Jenson71 · 06-04-2009, 10:15 AM

This blows my mind.

Okay, say you have two ball bearings. You hold one in your hand and drop it. The other you put in a gun, point it straight forward, as level as the one in your hand, and pull the trigger, sending it hundreds of yards.

Which one lands first?

The one dropped in your hand right? RIGHT!?!?

No, actually they both hit the ground at the same time.

This is because the vertical component of motion is the same for both objects. They both fall vertically the same distance at about 10 meters per second squared (gravity, actually more like 9.8).

But Jenson, Jenson! What about the horizontal component of the gun-fired ball bearing? Actually, when air resistance is small enough to ignore as it is in this case (being that the bearings are exactly alike), the horizontal and vertical components of a projectile's velocity are completely independent of one another.

And, in this experiment, the gun-fired bearing is constantly falling from the moment it is fired. Yes, it looks like it is holding up in a straight line, but, it's actually falling and it's just hard to see with our eyes. And again, it is falling at exactly the same speed as the ball bearing you released in your hand -- the speed of gravity.

Post more cool science things in this thread.

I think I will later post Aristotle vs. Galileo and gravity, for a little history spin on science.

Silock · 06-04-2009, 01:02 PM

Quote:

Originally Posted by bdeg

explain to me how it will get off the ground if it can't accelerate in relation to the air

The only way it can't accelerate is if there is no air to push against. The wheels are irrelevant.

**Buck** · 06-04-2009, 01:03 PM

Quote:

Originally Posted by Baby Lee

You don't gain momentum in a jet by pushing the pavement below you backward, you push the atmosphere behind you backwards.

Unless that treadmill can manipulate the atmosphere, it's irrelevant.

This.

P.S. I know this because it was on Mythbusters the other day.

bdeg · 06-04-2009, 01:04 PM

Quote:

Originally Posted by Silock

The only way it can't accelerate is if there is no air to push against. The wheels are irrelevant.

you are just underestimating this ba tread mill we have here.

it doesn't matter that the plane isn't propelled by the wheels, the wheels are attached to the plane, if the wheels don't move, the plane doesn't move

**Buck** · 06-04-2009, 01:04 PM

The plane doesnt use the ground to accelerate like a car does. You are mistaken.

Watch the episode of the Mythbusters.

Silock · 06-04-2009, 01:05 PM

Quote:

Originally Posted by bdeg

i think you guys are just underestimating this ba tread mill we have here.

it doesn't matter that the plane isn't propelled by the wheels, the wheels are attached to the plane, if the wheels don't move, the plane doesn't move

Troooooooooooooollllllllllllllllllllllllllling

bdeg · 06-04-2009, 01:05 PM

a regular treadmill, sure, i agree

but the one in this question would make a plane unable to liftoff

MagicHef · 06-04-2009, 01:06 PM

Quote:

Originally Posted by MediaCenterJunkie

The plane doesnt use the ground to accelerate like a car does. You are mistaken.

Watch the episode of the Mythbusters.

So, since the wheels are unable to move, are you suggesting that the plane rips its landing gear off?

**Buck** · 06-04-2009, 01:06 PM

Quote:

Originally Posted by bdeg

you are just underestimating this ba tread mill we have here.

it doesn't matter that the plane isn't propelled by the wheels, the wheels are attached to the plane, if the wheels don't move, the plane doesn't move

Why dont you get it?

The wheels aren't pushing the plane?

The treadmill cannot keep the plane from moving.

The Wheels are not connected to a drivetrain or anything, the wheels are just connected to to some ball bearings or whatever and spin freely.

The propulsion of the plane comes from the air.

A treadmill cannot keep a plane from moving.

bdeg · 06-04-2009, 01:07 PM

Quote:

Originally Posted by Silock

Troooooooooooooollllllllllllllllllllllllllling

i don't even understand what you mean

that i'm being intentionally obnoxious?

Quote:

Originally Posted by MediaCenterJunkie

The plane doesnt use the ground to accelerate like a car does. You are mistaken.

Watch the episode of the Mythbusters.

doesn't matter. if everytime the plane moves forward 100 feet in a second, the treadmill moves back 100 feet per second, the plane will not take off.

**Buck** · 06-04-2009, 01:08 PM

Lets look at it this way.

If you put a bird on rollerskates and told it to flap its wings to move forward, would the bird not move forward? The wheels would spin, but its using the air to move, not its feet.

Silock · 06-04-2009, 01:08 PM

Planes without wheels take off all the time.

MagicHef · 06-04-2009, 01:09 PM

Quote:

Originally Posted by Silock

Planes without wheels take off all the time.

It's not a plane without wheels.

bdeg · 06-04-2009, 01:09 PM

ok, i admit, im high

i understand

the wheel would just spin

damn, of course im beaten to that too

i lose

MagicHef · 06-04-2009, 01:10 PM

Quote:

Originally Posted by MediaCenterJunkie

Lets look at it this way.

If you put a bird on rollerskates and told it to flap its wings to move forward, would the bird not move forward? The wheels would spin, but its using the air to move, not its feet.

Birds don't understand English. Ridiculous scenario.

Silock · 06-04-2009, 01:10 PM

Quote:

Originally Posted by MagicHef

It's not a plane without wheels.

Might as well be.

06-04-2009, 10:15 AM
Jenson71 fides quaerens intellectum Join Date: Oct 2003 Location: United States Casino cash: $8330900	Something amazing to tell you concerning physics and motion This blows my mind. Okay, say you have two ball bearings. You hold one in your hand and drop it. The other you put in a gun, point it straight forward, as level as the one in your hand, and pull the trigger, sending it hundreds of yards. Which one lands first? The one dropped in your hand right? RIGHT!?!? No, actually they both hit the ground at the same time. This is because the vertical component of motion is the same for both objects. They both fall vertically the same distance at about 10 meters per second squared (gravity, actually more like 9.8). But Jenson, Jenson! What about the horizontal component of the gun-fired ball bearing? Actually, when air resistance is small enough to ignore as it is in this case (being that the bearings are exactly alike), the horizontal and vertical components of a projectile's velocity are completely independent of one another. And, in this experiment, the gun-fired bearing is constantly falling from the moment it is fired. Yes, it looks like it is holding up in a straight line, but, it's actually falling and it's just hard to see with our eyes. And again, it is falling at exactly the same speed as the ball bearing you released in your hand -- the speed of gravity. Post more cool science things in this thread. I think I will later post Aristotle vs. Galileo and gravity, for a little history spin on science.
Posts: 15,986

06-04-2009, 01:04 PM	#109
Buck Take a Chill Pill Join Date: Nov 2006 Location: South Carolina Casino cash: $6050295	The plane doesnt use the ground to accelerate like a car does. You are mistaken. Watch the episode of the Mythbusters.
Posts: 44,605

06-04-2009, 01:05 PM	#111
bdeg Veteran Join Date: Aug 2006 Location: iowa Casino cash: $10004900	a regular treadmill, sure, i agree but the one in this question would make a plane unable to liftoff
Posts: 2,987

06-04-2009, 01:08 PM	#115
Buck Take a Chill Pill Join Date: Nov 2006 Location: South Carolina Casino cash: $6050295	Lets look at it this way. If you put a bird on rollerskates and told it to flap its wings to move forward, would the bird not move forward? The wheels would spin, but its using the air to move, not its feet.
Posts: 44,605

06-04-2009, 01:08 PM	#116
Silock MVP Join Date: Dec 2006 Location: Overland Park Casino cash: $10020882	Planes without wheels take off all the time.
Posts: 19,908

06-04-2009, 01:09 PM	#118
bdeg Veteran Join Date: Aug 2006 Location: iowa Casino cash: $10004900	ok, i admit, im high i understand the wheel would just spin damn, of course im beaten to that too i lose
Posts: 2,987