Science Something amazing to tell you concerning physics and motion - Page 2

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.

Sully · 06-04-2009, 10:30 AM

Quote:

Originally Posted by MediaCenterJunkie

3 friends go out to eat.

They get the bill and it is $25, but they don't really look at it too close.

They each give the waiter a $10 bill.

The Waiter decides since he cannot split $5 evenly among 3 people he decides to pocket $2, meaning the group paid a total of $27.

So the group paid $27 ($9 each), and he has $2 in his pocket, equaling $29.

What happened to the other dollar?

If he pocketed $2 they paid $28.

**Buck** · 06-04-2009, 10:30 AM

What if you shoot it into a Mountain? Then it will hit the ground first.

Jenson71 · 06-04-2009, 10:30 AM

Quote:

Originally Posted by notorious

I thought this at first, but as the bullet spins, it will create pressure differences (high or Low which creates lift) equal to all sides, which will cancel out any lift/gravity change. Only outside forces, such as updrafts and downdrafts will effect it's decent rate.

Oh, and we're in a vacuum.

**Buck** · 06-04-2009, 10:31 AM

Quote:

Originally Posted by Sully

If he pocketed $2 they paid $28.

While that makes sense, how do you explain the fact that they each paid $9? That equals $27.

orange · 06-04-2009, 10:31 AM

The bearing from the gun will land moments after the one you dropped. Unless the barrel of the gun has a length of 0. The barrel will prevent the bearing from falling until the bearing is out of the barrel.

**OnTheWarpath15** · 06-04-2009, 10:32 AM

Jenson71 · 06-04-2009, 10:33 AM

Quote:

Originally Posted by MediaCenterJunkie

3 friends go out to eat.

They get the bill and it is $25, but they don't really look at it too close.

They each give the waiter a $10 bill.

The Waiter decides since he cannot split $5 evenly among 3 people he decides to pocket $2, meaning the group paid a total of $27.

So the group paid $27 ($9 each), and he has $2 in his pocket, equaling $29.

What happened to the other dollar?

Oh I KNOW!!

You say they paid $27, and then add $2 which is already part of the $27. You shouldn't be adding that $2. Thus, it's only $27. So there are three dollars, which the waiter gives back to the people. It's deceptively written.

**Gonzo** · 06-04-2009, 10:33 AM

WTF? Wouldn't the powder charge make a difference?

Let's say Im shooting a 10 mm ball bearing with about 55 grains of rifle powder.

I'm shooting this bearing from a height of 4 ft. I drop the bearing in my other hand at the same time from 4 ft. and the hit the ground at the same time...

Ok, now I adjust the powder charge to 75 grains. I shoot from the same height, but now I have adjusted the velocity of the projectile by about 800-1,000 feet per second. This would have to be a variable somehow.

Sully · 06-04-2009, 10:33 AM

Quote:

Originally Posted by MediaCenterJunkie

While that makes sense, how do you explain the fact that they each paid $9? That equals $27.

I'm saying the math in your problem is incorrect. If he pocketed $3, then they would have each paid $9. But it says he pocketed $2 which makes it $27...which is bad math.

Fat Elvis · 06-04-2009, 10:34 AM

Quote:

Originally Posted by MediaCenterJunkie

3 friends go out to eat.

They get the bill and it is $25, but they don't really look at it too close.

They each give the waiter a $10 bill.

The Waiter decides since he cannot split $5 evenly among 3 people he decides to pocket $2, meaning the group paid a total of $27.

So the group paid $27 ($9 each), and he has $2 in his pocket, equaling $29.

What happened to the other dollar?

Apparently it went to the California Public School system because it didn't teach the students how to properly read and/or analyze word problems.

Sully · 06-04-2009, 10:34 AM

Quote:

Originally Posted by Jenson71

Oh I KNOW!!

You say they paid $27, and then add $2 which is already part of the $27. You shouldn't be adding that $2. Thus, it's only $27. So there are three dollars, which the waiter gives back to the people. It's deceptively written.

You are overthinking it!!!!!
$30-$2 is NOT $27!!

Jenson71 · 06-04-2009, 10:35 AM

Quote:

Originally Posted by orange

The bearing from the gun will land moments after the one you dropped. Unless the barrel of the gun has a length of 0. The barrel will prevent the bearing from falling until the bearing is out of the barrel.

Count from the moment it leaves the barrel.

Jenson71 · 06-04-2009, 10:37 AM

Quote:

Originally Posted by Sully

You are overthinking it!!!!!
$30-$2 is NOT $27!!

I'm just stretching it out for complete explanation.

**mikeyis4dcats.** · 06-04-2009, 10:38 AM

how many gallons are in a 5 gallon bucket?

**OnTheWarpath15** · 06-04-2009, 10:39 AM

Quote:

Originally Posted by mikeyis4dcats.

how many gallons are in a 5 gallon bucket?

None, until you fill it.

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, 10:30 AM	#17
Buck Take a Chill Pill Join Date: Nov 2006 Location: South Carolina Casino cash: $6180295	What if you shoot it into a Mountain? Then it will hit the ground first.
Posts: 44,604

06-04-2009, 10:31 AM	#20
orange MVP Join Date: Sep 2000 Location: Denver, CO Casino cash: $10004900	The bearing from the gun will land moments after the one you dropped. Unless the barrel of the gun has a length of 0. The barrel will prevent the bearing from falling until the bearing is out of the barrel.
Posts: 11,661

06-04-2009, 10:32 AM	#21
OnTheWarpath15 MVP Join Date: Sep 2005 Casino cash: $2211115
Posts: 60,746

06-04-2009, 10:33 AM	#23
Gonzo Stuff & Things Join Date: Jan 2006 Location: The Yukon Casino cash: $10126924	WTF? Wouldn't the powder charge make a difference? Let's say Im shooting a 10 mm ball bearing with about 55 grains of rifle powder. I'm shooting this bearing from a height of 4 ft. I drop the bearing in my other hand at the same time from 4 ft. and the hit the ground at the same time... Ok, now I adjust the powder charge to 75 grains. I shoot from the same height, but now I have adjusted the velocity of the projectile by about 800-1,000 feet per second. This would have to be a variable somehow.
Posts: 21,498

06-04-2009, 10:38 AM	#29
mikeyis4dcats. Scarlett Johansson's boytoy Join Date: Nov 2006 Casino cash: $9555998	how many gallons are in a 5 gallon bucket?
Posts: 12,526