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Site News The People of Virginia VS Grabigial BanBerger | ARFCOM News
6/22/2008 1:26:04 PM EDT
This question came to me driving down the interstate today. Hopefully someone could shed some light. The numbers are just rough figures.

This is the scenerio:

A car is driving 70 MPH. Passenger in car has a slingshot and fires a marble out of window at say 25 mph. Upon impact of a road sign, would the marble be traveling at 95 MPH?? Or would it be 45 MPH??




Im trying to figure out how Newtons Laws of Motion figure into this scenerio.
6/22/2008 1:27:05 PM EDT
[#1]
WHICH DIRECTION did he fire the projectile?

Edit, If you're talking in terms of Newton himself the pertinent law is Law III, Corollary II: The quantity of motion, which is obtained by taking the sum of the motions directed towards the same parts, and the difference of those that are directed to contrary parts, suffers no change from the action of the bodies among themselves
6/22/2008 1:28:13 PM EDT
[#2]
straight ahead
6/22/2008 1:29:31 PM EDT
[#3]

Quoted:
WHICH DIRECTION did he fire the projectile?


Yeah.

If he's shooting straight ahead, and is in a vacuum, it would be going 95 mph.  Likewise, if he was shooting straight backwards in the same conditions it would only travel 45 mph.  And just to blow your mind, if he shot it at a 90 degree angle to the cars direction it would go 25 mph out and 70 mph sideways.
6/22/2008 1:29:46 PM EDT
[#4]
95.  
6/22/2008 1:31:34 PM EDT
[#5]

Quoted:

Quoted:
WHICH DIRECTION did he fire the projectile?


Yeah.

If he's shooting straight ahead, and is in a vacuum, it would be going 95 mph.  Likewise, if he was shooting straight backwards in the same conditions it would only travel 45 mph.  And just to blow your mind, if he shot it at a 90 degree angle to the cars direction it would go 25 mph out and 70 mph sideways.


What would the total speed be relative to the ground, and at what angle relative to the direction of the vehicle?
6/22/2008 1:31:35 PM EDT
[#6]
Is the car on a treadmill?





I apologize. Couldn't help it.
6/22/2008 1:32:33 PM EDT
[#7]
A little less than 95.

The wind will slow it down a bit.
6/22/2008 1:32:34 PM EDT
[#8]
If a T38 were to fly at Mach 1 and fire a 10/22 with T22s in the magazine out the tail, the bullets would fall to ground with almost no forward velocity.  But they would be spinning at 50,000 RPM.
6/22/2008 1:33:02 PM EDT
[#9]

Quoted:

Quoted:

Quoted:
WHICH DIRECTION did he fire the projectile?


Yeah.

If he's shooting straight ahead, and is in a vacuum, it would be going 95 mph.  Likewise, if he was shooting straight backwards in the same conditions it would only travel 45 mph.  And just to blow your mind, if he shot it at a 90 degree angle to the cars direction it would go 25 mph out and 70 mph sideways.


What would the total speed be relative to the ground, and at what angle relative to the direction of the vehicle?


I'm gonna need a calculator for that
6/22/2008 1:33:24 PM EDT
[#10]
I was thinking one way of shooting would give you 95, the otherway would give ya 45 but couldnt remember. Thanks
6/22/2008 1:34:38 PM EDT
[#11]

Quoted:
Is the car on a treadmill?





I apologize. Couldn't help it.




LOL i was thinking about that after i posted this question
6/22/2008 1:35:49 PM EDT
[#12]
edit, nm... waited too long to post
6/22/2008 1:44:32 PM EDT
[#13]
thinking abuot this hurts my head
6/22/2008 1:48:18 PM EDT
[#14]

Quoted:

Quoted:

Quoted:

Quoted:
WHICH DIRECTION did he fire the projectile?


Yeah.

If he's shooting straight ahead, and is in a vacuum, it would be going 95 mph.  Likewise, if he was shooting straight backwards in the same conditions it would only travel 45 mph.  And just to blow your mind, if he shot it at a 90 degree angle to the cars direction it would go 25 mph out and 70 mph sideways.


What would the total speed be relative to the ground, and at what angle relative to the direction of the vehicle?


I'm gonna need a calculator for that
74.33mph

I'd have to relearn trig for the direction
6/22/2008 1:49:43 PM EDT
[#15]

Quoted:

Quoted:
WHICH DIRECTION did he fire the projectile?


Yeah.

If he's shooting straight ahead, and is in a vacuum, it would be going 95 mph.  Likewise, if he was shooting straight backwards in the same conditions it would only travel 45 mph.  And just to blow your mind, if he shot it at a 90 degree angle to the cars direction it would go 25 mph out and 70 mph sideways.


Those initial conditions are applicable to the Space Shuttle Door Gunner questions
6/22/2008 1:52:29 PM EDT
[#16]
What's the vector, Victor?
6/22/2008 1:53:20 PM EDT
[#17]

Quoted:
If a T38 were to fly at Mach 1 and fire a 10/22 with T22s in the magazine out the tail, the bullets would fall to ground with almost no forward velocity.  But they would be spinning at 50,000 RPM.


If a F11F-1 was in a 20 degree descent and emptied it's 20mm cannon into the air, would it shoot itself down seconds later?
6/22/2008 1:53:53 PM EDT
[#18]

Quoted:
What's the vector, Victor?

Roger, Rodger!
6/22/2008 1:56:47 PM EDT
[#19]

Quoted:

Quoted:
WHICH DIRECTION did he fire the projectile?


Yeah.

If he's shooting straight ahead, and is in a vacuum, it would be going 95 mph.  Likewise, if he was shooting straight backwards in the same conditions it would only travel 45 mph.  And just to blow your mind, if he shot it at a 90 degree angle to the cars direction it would go 25 mph out and 70 mph sideways.


Vectors are fun! Well, that is what my physics teacher said.
6/22/2008 2:00:46 PM EDT
[#20]

Quoted:

Quoted:
What's the vector, Victor?

Roger, Rodger!


Do you like watching Gladiator movies?
6/22/2008 2:11:51 PM EDT
[#21]

Quoted:

Quoted:

Quoted:

Quoted:

Quoted:
WHICH DIRECTION did he fire the projectile?


Yeah.

If he's shooting straight ahead, and is in a vacuum, it would be going 95 mph.  Likewise, if he was shooting straight backwards in the same conditions it would only travel 45 mph.  And just to blow your mind, if he shot it at a 90 degree angle to the cars direction it would go 25 mph out and 70 mph sideways.


What would the total speed be relative to the ground, and at what angle relative to the direction of the vehicle?


I'm gonna need a calculator for that
74.33mph

I'd have to relearn trig for the direction


I get 19.65.  Inverse tangent of the opposite side over the adjacent side (25/70), so it should be inverse tangent of .36.  If I remember how to work my calculator, that's 19.65 degrees.
6/22/2008 2:13:15 PM EDT
[#22]
African or European?
6/22/2008 2:17:51 PM EDT
[#23]

Quoted:

Quoted:

Quoted:
What's the vector, Victor?

Roger, Rodger!


Do you like watching Gladiator movies?


Surely you can't be serious.
6/22/2008 2:22:10 PM EDT
[#24]

Quoted:

Quoted:

Quoted:
What's the vector, Victor?

Roger, Rodger!


Do you like watching Gladiator movies?


Have you ever been to a Turkish prison?
6/22/2008 2:23:50 PM EDT
[#25]

Quoted:

Quoted:

Quoted:

Quoted:
What's the vector, Victor?

Roger, Rodger!


Do you like watching Gladiator movies?


Surely you can't be serious.


Stop calling me Shirley
6/22/2008 2:27:01 PM EDT
[#26]

I'm waiting for someone to post the traditional follow-up question.
6/22/2008 2:27:17 PM EDT
[#27]

Quoted:

Quoted:

Quoted:

Quoted:

Quoted:
What's the vector, Victor?

Roger, Rodger!


Do you like watching Gladiator movies?


Surely you can't be serious.


Stop calling me Shirley


WRONG!!!

"I am serious, and don't call me Shirley"
6/22/2008 2:43:02 PM EDT
[#28]

Quoted:

Quoted:

Quoted:

Quoted:

Quoted:

Quoted:
What's the vector, Victor?

Roger, Rodger!


Do you like watching Gladiator movies?


Surely you can't be serious.


Stop calling me Shirley


WRONG!!!

"I am serious, and don't call me Shirley"


My bad, been about ten years since I last watched it.
6/22/2008 2:46:04 PM EDT
[#29]

Quoted:
African or European?


The marble or the car?
6/22/2008 2:46:05 PM EDT
[#30]
Assuming he fired forward, 95 mph in a vacuum (except IC engines don't like dat), slightly less in an earth density atmosphere.
6/22/2008 2:55:59 PM EDT
[#31]
But what if the car is cruising at .7c and fires the marble at a relative velocity of...
6/22/2008 3:49:10 PM EDT
[#32]

Quoted:
African or European?
6/22/2008 6:23:04 PM EDT
[#33]
Do the flies flying around in the car add positive or negative drag when flying toward the windshield.
6/23/2008 2:23:03 AM EDT
[#34]

Quoted:
But what if the car is cruising at .7c and fires the marble at a relative velocity of...


Close...
6/23/2008 3:33:33 AM EDT
[#35]
two body problem
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