| Topic: |
Science > Physics |
| User: |
"" |
| Date: |
17 Apr 2006 04:29:31 AM |
| Object: |
Look for some experiment inspiration |
I'm going to operating a physics experiment project. The problem now is
i want to find some experiment subject which is about our daily life.
If you could give some clews, i will be very apperciated and do my best
to achieve it. Thank you.
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| User: "CWatters" |
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| Title: Re: Look for some experiment inspiration |
17 Apr 2006 05:04:07 AM |
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<liuge10@gmail.com> wrote in message
news:1145266171.524170.211930@u72g2000cwu.googlegroups.com...
I'm going to operating a physics experiment project. The problem now is
i want to find some experiment subject which is about our daily life.
If you could give some clews....
Web definition..
clews
Anoun
1 clews
the cords used to suspend a hammock
So how about working out the equation for the swing period of a hammock
(Probably like a pendulum but how do you calculate the length?).
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| User: "Sam Wormley" |
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| Title: Re: Look for some experiment inspiration |
17 Apr 2006 11:16:31 AM |
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wrote:
I'm going to operating a physics experiment project. The problem now is
i want to find some experiment subject which is about our daily life.
If you could give some clews, i will be very apperciated and do my best
to achieve it. Thank you.
Unless you want to do something new, I would recreate Galileo's
inclined planes with adjustable "sounders" and use a two or more
ball pendulum as an audible clock!
http://www.president.vt.edu/presreports/pres0102/balls.jpg
http://www.pasco.com/ci6877/jpegs/inclined_plane.jpg
There is a lot to be learned from those simple experiments that
Galileo did.
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| User: "" |
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| Title: Re: Look for some experiment inspiration |
18 Apr 2006 04:18:19 PM |
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wrote:
I'm going to operating a physics experiment project. The problem now is
i want to find some experiment subject which is about our daily life.
If you could give some clews, i will be very apperciated and do my best
to achieve it. Thank you.
How about working to collect energy from sound waves, and testing
various methods to see which one (or ones) work(s) best? I'm willing to
give up that idea to you because I believe it has some interesting uses
and because I would like to see them more than to gain profit from
them, as I really don't have a way of actually creating a device that
can use sound to get energy.
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| User: "PD" |
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| Title: Re: Look for some experiment inspiration |
17 Apr 2006 10:38:22 AM |
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wrote:
I'm going to operating a physics experiment project. The problem now is
i want to find some experiment subject which is about our daily life.
If you could give some clews, i will be very apperciated and do my best
to achieve it. Thank you.
Roller coaster physics. You can build a vertical accelerometer with a
plexiglass tube, a paper clip, two rubber bands, and a fishing weight.
You can build a horizontal accelerometer with a plastic protractor, a
string, and a fishing weight. You'll want to ride the roller coaster at
least a dozen times to take repeated measurements.
PD
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| User: "Timo Nieminen" |
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| Title: Re: Look for some experiment inspiration |
17 Apr 2006 02:58:26 PM |
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On Tue, 17 Apr 2006, PD wrote:
liuge10@gmail.com wrote:
I'm going to operating a physics experiment project. The problem now is
i want to find some experiment subject which is about our daily life.
If you could give some clews, i will be very apperciated and do my best
to achieve it. Thank you.
Roller coaster physics. You can build a vertical accelerometer with a
plexiglass tube, a paper clip, two rubber bands, and a fishing weight.
You can build a horizontal accelerometer with a plastic protractor, a
string, and a fishing weight. You'll want to ride the roller coaster at
least a dozen times to take repeated measurements.
One of my students built an accelerometer (just the horizontal variety,
with a cardboard scale marked in m/s^2 and g). He tested his car.
Afterwards, he said that it was very interesting, since he hadn't realised
before that physics could have any connection with real life.
--
Timo Nieminen - Home page: http://www.physics.uq.edu.au/people/nieminen/
E-prints: http://eprint.uq.edu.au/view/person/Nieminen,_Timo_A..html
Shrine to Spirits: http://www.users.bigpond.com/timo_nieminen/spirits.html
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| User: "PD" |
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| Title: Re: Look for some experiment inspiration |
17 Apr 2006 03:30:48 PM |
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Timo Nieminen wrote:
On Tue, 17 Apr 2006, PD wrote:
liuge10@gmail.com wrote:
I'm going to operating a physics experiment project. The problem now is
i want to find some experiment subject which is about our daily life.
If you could give some clews, i will be very apperciated and do my best
to achieve it. Thank you.
Roller coaster physics. You can build a vertical accelerometer with a
plexiglass tube, a paper clip, two rubber bands, and a fishing weight.
You can build a horizontal accelerometer with a plastic protractor, a
string, and a fishing weight. You'll want to ride the roller coaster at
least a dozen times to take repeated measurements.
One of my students built an accelerometer (just the horizontal variety,
with a cardboard scale marked in m/s^2 and g). He tested his car.
Afterwards, he said that it was very interesting, since he hadn't realised
before that physics could have any connection with real life.
This is a sad commentary indeed. As a matter of course while teaching
2D trajectories in free-fall, I would draw several candidate paths,
including the usual boondoggles like the "coyote vs roadrunner" (where
the motion turns suddenly from horizontal to vertical), a quarter
circle (the horizontal motion transforms into vertical motion), a
straight line, etc. When I collected the dismaying results of this
poll, I then would ask how many had been to a baseball game and had
seen the path of a fly ball. They would all raise their hands.
"Well, then, why woould you say it looks like *this* when you know
better from your everyday experience?"
Invariably someone raises their hand and says something to the effect
of, "But baseball is real life. We thought you were talking about
physics."
PD
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| User: "Timo Nieminen" |
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| Title: Re: Look for some experiment inspiration |
17 Apr 2006 03:49:02 PM |
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On Tue, 17 Apr 2006, PD wrote:
Timo Nieminen wrote:
On Tue, 17 Apr 2006, PD wrote:
liuge10@gmail.com wrote:
I'm going to operating a physics experiment project. The problem now is
i want to find some experiment subject which is about our daily life.
If you could give some clews, i will be very apperciated and do my best
to achieve it. Thank you.
Roller coaster physics. You can build a vertical accelerometer with a
plexiglass tube, a paper clip, two rubber bands, and a fishing weight.
You can build a horizontal accelerometer with a plastic protractor, a
string, and a fishing weight. You'll want to ride the roller coaster at
least a dozen times to take repeated measurements.
One of my students built an accelerometer (just the horizontal variety,
with a cardboard scale marked in m/s^2 and g). He tested his car.
Afterwards, he said that it was very interesting, since he hadn't realised
before that physics could have any connection with real life.
This is a sad commentary indeed. As a matter of course while teaching
2D trajectories in free-fall, I would draw several candidate paths,
including the usual boondoggles like the "coyote vs roadrunner" (where
the motion turns suddenly from horizontal to vertical), a quarter
circle (the horizontal motion transforms into vertical motion), a
straight line, etc. When I collected the dismaying results of this
poll, I then would ask how many had been to a baseball game and had
seen the path of a fly ball. They would all raise their hands.
"Well, then, why woould you say it looks like *this* when you know
better from your everyday experience?"
Invariably someone raises their hand and says something to the effect
of, "But baseball is real life. We thought you were talking about
physics."
I think a little time spent on history would be good. A lot of thought
about physics went on between Aristoltle and Galileo, and to cover this,
even if only briefly, would be good (there's a nice paper in AJP about
medieval development of ideas about inertia, covering this quite well).
Then, one is in a position to understand the why of Galileo and Newton's
Laws of Motion.
The classic treatment of projectile motion in introductory physics, where
air resistance is only ever mentioned as something to ignore, idealises
the physics to the point where often enough the result is contrary to
everyday experience. Arrows, papers planes etc don't follow parabolic
trajectories (but baseballs do so closely enough).
Newton's 1st Law took so long to appear since it's unobservable in
everyday life. Even the planets move in circles, with no apparent force
acting on them (hence, "circular motion is the natural state of motion").
--
Timo Nieminen - Home page: http://www.physics.uq.edu.au/people/nieminen/
E-prints: http://eprint.uq.edu.au/view/person/Nieminen,_Timo_A..html
Shrine to Spirits: http://www.users.bigpond.com/timo_nieminen/spirits.html
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| User: "PD" |
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| Title: Re: Look for some experiment inspiration |
17 Apr 2006 04:02:51 PM |
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Timo Nieminen wrote:
On Tue, 17 Apr 2006, PD wrote:
Timo Nieminen wrote:
On Tue, 17 Apr 2006, PD wrote:
liuge10@gmail.com wrote:
I'm going to operating a physics experiment project. The problem now is
i want to find some experiment subject which is about our daily life.
If you could give some clews, i will be very apperciated and do my best
to achieve it. Thank you.
Roller coaster physics. You can build a vertical accelerometer with a
plexiglass tube, a paper clip, two rubber bands, and a fishing weight.
You can build a horizontal accelerometer with a plastic protractor, a
string, and a fishing weight. You'll want to ride the roller coaster at
least a dozen times to take repeated measurements.
One of my students built an accelerometer (just the horizontal variety,
with a cardboard scale marked in m/s^2 and g). He tested his car.
Afterwards, he said that it was very interesting, since he hadn't realised
before that physics could have any connection with real life.
This is a sad commentary indeed. As a matter of course while teaching
2D trajectories in free-fall, I would draw several candidate paths,
including the usual boondoggles like the "coyote vs roadrunner" (where
the motion turns suddenly from horizontal to vertical), a quarter
circle (the horizontal motion transforms into vertical motion), a
straight line, etc. When I collected the dismaying results of this
poll, I then would ask how many had been to a baseball game and had
seen the path of a fly ball. They would all raise their hands.
"Well, then, why woould you say it looks like *this* when you know
better from your everyday experience?"
Invariably someone raises their hand and says something to the effect
of, "But baseball is real life. We thought you were talking about
physics."
I think a little time spent on history would be good. A lot of thought
about physics went on between Aristoltle and Galileo, and to cover this,
even if only briefly, would be good (there's a nice paper in AJP about
medieval development of ideas about inertia, covering this quite well).
Then, one is in a position to understand the why of Galileo and Newton's
Laws of Motion.
The classic treatment of projectile motion in introductory physics, where
air resistance is only ever mentioned as something to ignore, idealises
the physics to the point where often enough the result is contrary to
everyday experience. Arrows, papers planes etc don't follow parabolic
trajectories (but baseballs do so closely enough).
Newton's 1st Law took so long to appear since it's unobservable in
everyday life. Even the planets move in circles, with no apparent force
acting on them (hence, "circular motion is the natural state of motion").
I've always found that throwing chalk in the classroom and taking the
time to *watch* it does as much good as anything.
Another superb example is the rope and the bucket, swung in a
horizontal circle. By *watching* what the hand does while speeding the
bucket up, you can really clearly delineate the tangential part of the
rope's tension (and the tangential acceleration) from the radial part
(centripetal acceleration).
Same thing goes with a spinning bicycle wheel supported at both ends of
the axle, one of which supports you are about to remove. With generous
use of the right-hand-rule and vector addition you can *predict* the
direction and the relative rate of precession (slowing the wheel down)
before actually seeing what happens. When it indeed does something
non-obvious, the reaction is unilaterally "son of a GUN! It works!"
PD
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| User: "Timo Nieminen" |
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| Title: Re: Look for some experiment inspiration |
18 Apr 2006 03:16:43 PM |
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On Tue, 17 Apr 2006, PD wrote:
Timo Nieminen wrote:
I think a little time spent on history would be good. A lot of thought
about physics went on between Aristoltle and Galileo, and to cover this,
even if only briefly, would be good (there's a nice paper in AJP about
medieval development of ideas about inertia, covering this quite well).
Then, one is in a position to understand the why of Galileo and Newton's
Laws of Motion.
[cut]
I've always found that throwing chalk in the classroom and taking the
time to *watch* it does as much good as anything.
I'm certainly not suggesting getting rid of demos like that. A nice demo
of Newton 1 in action would be good, but even pucks on air tables etc stop
after a while. N1 opposes common sense, since we can't observe it in
everyday life. Despite sneers about "angels on the head of a pin"[1], the
medieval thinkers weren't stupid, and a little coverage of what they
thought and wrote might help bridge the gulf between N1 and everyday
experience.
[1] Of course, it was the _point_ of a pin, and if you believe in angels,
whether the answer is 0, 1 or infinite might well be of interest.
--
Timo Nieminen - Home page: http://www.physics.uq.edu.au/people/nieminen/
E-prints: http://eprint.uq.edu.au/view/person/Nieminen,_Timo_A..html
Shrine to Spirits: http://www.users.bigpond.com/timo_nieminen/spirits.html
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| User: "PD" |
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| Title: Re: Look for some experiment inspiration |
18 Apr 2006 03:43:27 PM |
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Timo Nieminen wrote:
On Tue, 17 Apr 2006, PD wrote:
Timo Nieminen wrote:
I think a little time spent on history would be good. A lot of thought
about physics went on between Aristoltle and Galileo, and to cover this,
even if only briefly, would be good (there's a nice paper in AJP about
medieval development of ideas about inertia, covering this quite well).
Then, one is in a position to understand the why of Galileo and Newton's
Laws of Motion.
[cut]
I've always found that throwing chalk in the classroom and taking the
time to *watch* it does as much good as anything.
I'm certainly not suggesting getting rid of demos like that. A nice demo
of Newton 1 in action would be good, but even pucks on air tables etc stop
after a while. N1 opposes common sense, since we can't observe it in
everyday life. Despite sneers about "angels on the head of a pin"[1], the
medieval thinkers weren't stupid, and a little coverage of what they
thought and wrote might help bridge the gulf between N1 and everyday
experience.
[1] Of course, it was the _point_ of a pin, and if you believe in angels,
whether the answer is 0, 1 or infinite might well be of interest.
Agreed.
Of all the introductory texts, I believe the only one that does more
than a half-hearted attempt to deliver Newton's law of gravitation in
any way other than ex cathedra is Doug Giancoli's book. DG at least
gives a respectable shot at attempting to explain how the law got
assembled from the data and from the 2nd and 3rd laws of motion.
PD
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