When a plane/car starts to accelerate on ground, and you take mass (say, fuzzy dice) and hang it, why does it hang backwards? Shouldn't it still point straight down (gravity) relative to everything?
Physics question: fuzzy dice in a car/plane
- Thread starter Bkas
- Start date
When everything has returned to equilibrium (ie you're moving at a constant speed) it will hang straight down once more.
Until then, you're accelerating an object that is not rigidly suspended. Like any object with mass, it resists change in momentum. Hence it doesn't hang straight.
It's exactly the same reason your head gets snapped back by a powerful car.
Viper GTS
Until then, you're accelerating an object that is not rigidly suspended. Like any object with mass, it resists change in momentum. Hence it doesn't hang straight.
It's exactly the same reason your head gets snapped back by a powerful car.
Viper GTS
No! Your head is snapped back by surge, change in acceleration. At constant acceleration, there is no head snapping.
Gravity and acceleration are indistinguishible. When both are present, operating in different vectors, the string points along the combined vector.
Sure there is. Well, it might not be a "snap," but with constant accelleration, you'll be pressed into the seat.
Your head is under constant force under constant acceleration, it only stays upright because:
1) Your neck is much more rigid than a string
2) You have the ability to control it
The principles are exactly the same.
Viper GTS
BoberFett
Lifer
- Oct 9, 1999
- 37,562
- 9
- 81
So it's like a "centrifugal force"?
Why wouldn't it hang forward, then? Go with the car/plane? Can soemone explain this in terms of force equations (like you did back in high school physics)? I'm just curious.
No, I don't mean centripetal force. I mean centrifugal. Look it up.
Actually, the entire body is not relaly rotating, so I can't call it centrifugal. I take it back.
Centrifugal force is an imaginary force that doesn't really exist
Centripital force is the force vector pointing inwards in any uniform circular motion.
I realize your head is pushed back.. I THOUGHT that was a given. That is what I was saying. When there is alot of surge, you can't react quickly enough to prevent your head from snapping back.Originally posted by: Viper GTS
Your head is under constant force under constant acceleration, it only stays upright because:
1) Your neck is much more rigid than a string
2) You have the ability to control it
The principles are exactly the same.
Viper GTS
Why do I have to spell everything out? "
Your head is snapped back by surge, change in acceleration.
Where did I say anything about there NOT being a force on your head under constant acceleration?
Constant acceleration means your muscles have to exert a constant force. It's just like if you were leaning and your neck muscles were keeping your head upright. Neck snapping because of surge is like tilting your head sideways and jumping. There are changes in acceleration. It is NOT the same principle.
Originally posted by: Elemental007
Centrifugal force is an imaginary force that doesn't really exist
Centripital force is the force vector pointing inwards in any uniform circular motion.
yea thats what I was thinking...
JC
Diamond Member
- Feb 1, 2000
- 5,855
- 73
- 91
Originally posted by: Elemental007
Centrifugal force is an imaginary force that doesn't really exist
Centripital force is the force vector pointing inwards in any uniform circular motion.
Doesn't centripetal acceleration point outwards? The force tries to push things out from the center, yes?
There are some seriously misguided people here.
Centripetal
Centrifugal
And Jellomancer, it is exactly the same principle. Yes, we can hold our heads still. And yes, a sudden or severe change in acceleration will cause us to lose control.
We are not, however, talking about reaction time our our own muscle strength. We are simply considering the tendency of an object to resist changes in momentum. I was relating it to something he probably feels every day.
Viper GTS
Centripetal
Centrifugal
And Jellomancer, it is exactly the same principle. Yes, we can hold our heads still. And yes, a sudden or severe change in acceleration will cause us to lose control.
We are not, however, talking about reaction time our our own muscle strength. We are simply considering the tendency of an object to resist changes in momentum. I was relating it to something he probably feels every day.
Viper GTS
No, you're absolutely right. There must be a bug in the physics logic.
I submitted a problem ticket to the techs, and they said they'll get right on it.
Originally posted by: JC
Originally posted by: Elemental007
Centrifugal force is an imaginary force that doesn't really exist
Centripital force is the force vector pointing inwards in any uniform circular motion.
Doesn't centripetal acceleration point outwards? The force tries to push things out from the center, yes?
No.
Without trying to explain basic, fundamental dynamics:
SparkNotes.
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