| Topic: |
Science > Physics |
| User: |
"radio" |
| Date: |
03 Oct 2005 04:58:17 PM |
| Object: |
how to answer this question? |
i have been trying to answer this question on my own for a while now
but i can't seem a get an appropriate answer.
QUESTION: suppose you observe an object from a reference frame and find
that it has an acceleration, vector a, when there are no forces acting
on it. how can you use this info to find an inertial frame?
note: this is the question. i have nothing more. I would assume the
frame of reference is accelerating with the same magnitude too but how
do you answer this question?
I thought that, by logic, the force causing the frame of reference
itself to move must be accelerating with the same magnitude ,a, but in
the opposite direction. however, how do i find the actual inertial
frame? and does logic/intuition counts as a reasoning? You can't just
say using N 2nd law, can you?
I'd really appreciate a proper answer to this question. I hope you guys
help. Thank you in advance
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| User: "CWatters" |
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| Title: Re: how to answer this question? |
03 Oct 2005 05:38:13 PM |
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"radio" <inversinfinity@gmail.com> wrote in message
news:1128376697.453890.110710@g14g2000cwa.googlegroups.com...
i have been trying to answer this question on my own for a while now
but i can't seem a get an appropriate answer.
QUESTION: suppose you observe an object from a reference frame and find
that it has an acceleration, vector a, when there are no forces acting
on it. how can you use this info to find an inertial frame?
I don't really know what I'm talking about here .:-) but....
It says "an inertial frame" not "it's inertial frame". Does that make a
difference?. Perhaps the answer is just "subtract vector a to get your
frame"?
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| User: "radio" |
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| Title: Re: how to answer this question? |
03 Oct 2005 07:07:52 PM |
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yeah i thought so too...but just like you i'm not sure i totally
understand frames of references yet. but, yeah i'd say you could
subtract acceleration vector a from the frame of reference but is that
the proper answer you think? I wish someone would give a concrete
answer lol...i'm dumb...but thx for the input.
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| User: "" |
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| Title: Re: how to answer this question? |
03 Oct 2005 09:49:34 PM |
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I agree with Harry C.
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| User: "" |
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| Title: Re: how to answer this question? |
03 Oct 2005 05:23:05 PM |
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Quite simply, if you have anything accelerating in ANY reference frame
with no foces applied to it, you simply have a flawed measurement of
either acceleration or applied force.
f = ma. There are no known exceptions.
It's sort of what today's kinds term a "No Brainer".
Harry C.
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| User: "radio" |
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| Title: Re: how to answer this question? |
03 Oct 2005 05:37:50 PM |
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when you accelerate inside a car don't you experience a force pinning
you back to your seat? The force is there i'd say.
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| User: "CWatters" |
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| Title: Re: how to answer this question? |
04 Oct 2005 05:00:07 AM |
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"radio" <inversinfinity@gmail.com> wrote in message
news:1128379070.534941.42980@g47g2000cwa.googlegroups.com...
when you accelerate inside a car don't you experience a force pinning
you back to your seat? The force is there i'd say.
Obviously but the question says there is no force. Therefore it's not the
object that's accelerating but the observer.
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| User: "Sam Wormley" |
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| Title: Re: how to answer this question? |
03 Oct 2005 10:43:31 PM |
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radio wrote:
QUESTION: suppose you observe an object from a reference frame and find
that it has an acceleration, vector a, when there are no forces acting
on it. how can you use this info to find an inertial frame?
Newton's second law -- if there is an acceleration of the mass, there
is a force.
http://scienceworld.wolfram.com/physics/NewtonsSecondLaw.html
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| User: "PD" |
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| Title: Re: how to answer this question? |
04 Oct 2005 03:21:19 AM |
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Sam Wormley wrote:
radio wrote:
QUESTION: suppose you observe an object from a reference frame and find
that it has an acceleration, vector a, when there are no forces acting
on it. how can you use this info to find an inertial frame?
Newton's second law -- if there is an acceleration of the mass, there
is a force.
http://scienceworld.wolfram.com/physics/NewtonsSecondLaw.html
In an inertial frame...
This is viewed from an accelerated frame, and the best way to find an
inertial frame is to accelerate from the current reference frame along
with the body (in the same direction and with the same magnitude), so
that its acceleration in the new frame is zero, making Newton's first
law hold, meaning that it is now an inertial frame.
PD
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| User: "Sam Wormley" |
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| Title: Re: how to answer this question? |
04 Oct 2005 09:50:12 AM |
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PD wrote:
Sam Wormley wrote:
radio wrote:
QUESTION: suppose you observe an object from a reference frame and find
that it has an acceleration, vector a, when there are no forces acting
on it. how can you use this info to find an inertial frame?
Newton's second law -- if there is an acceleration of the mass, there
is a force.
http://scienceworld.wolfram.com/physics/NewtonsSecondLaw.html
In an inertial frame...
This is viewed from an accelerated frame, and the best way to find an
inertial frame is to accelerate from the current reference frame along
with the body (in the same direction and with the same magnitude), so
that its acceleration in the new frame is zero, making Newton's first
law hold, meaning that it is now an inertial frame.
PD
Thanks.
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| User: "radio" |
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| Title: Re: how to answer this question? |
04 Oct 2005 04:04:32 PM |
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bingo! yeah...i was gonna suggest that making all obejects in the frame
of reference accelerate with vector a would lead to an inertial frame
but you put it down much better...thank you.
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