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Equivalence principle before Einstein
How exactly was the principle of conservation of energy discovered?
$begingroup$
In a German interview some physicists were asked, what they would ask Einstein, if he were alive today. One of them wanted to know how Einstein came up with the idea of the equivalence principle, that inertial mass is the same as gravitational mass. Correct me if I'm wrong, but I always believed that was known way before Einstein. And I have an experiment in mind where one famous guy standing on a leaning tower and letting two things fall with different mass to test if gravity acts on every object the same.
My question is, does somebody know the name of this famous person, who conducted the experiment? I can't remember it.
untagged
asked 9 hours ago
MaximMaxim
1213
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migrated from physics.stackexchange.com 5 hours ago
This question came from our site for active researchers, academics and students of physics.
add a comment |
$begingroup$
In a German interview some physicists were asked, what they would ask Einstein, if he were alive today. One of them wanted to know how Einstein came up with the idea of the equivalence principle, that inertial mass is the same as gravitational mass. Correct me if I'm wrong, but I always believed that was known way before Einstein. And I have an experiment in mind where one famous guy standing on a leaning tower and letting two things fall with different mass to test if gravity acts on every object the same.
My question is, does somebody know the name of this famous person, who conducted the experiment? I can't remember it.
untagged
asked 9 hours ago
MaximMaxim
1213
$endgroup$
migrated from physics.stackexchange.com 5 hours ago
This question came from our site for active researchers, academics and students of physics.
4
$begingroup$
Galileo Galilei, see en.wikipedia.org/wiki/Galileo_Galilei
$endgroup$
– hyportnex
9 hours ago
3
$begingroup$
"And I have an experiment in mind where one famous guy standing on a church and letting two things fall with different mass to test if gravity acts on every object the same." I think you mean Galileo Galilei.
$endgroup$
– Gert
9 hours ago
2
$begingroup$
I'm voting to close this question as off-topic because it's about the history of physics, not physics primarily.
$endgroup$
– Gert
9 hours ago
add a comment |
$begingroup$
In a German interview some physicists were asked, what they would ask Einstein, if he were alive today. One of them wanted to know how Einstein came up with the idea of the equivalence principle, that inertial mass is the same as gravitational mass. Correct me if I'm wrong, but I always believed that was known way before Einstein. And I have an experiment in mind where one famous guy standing on a leaning tower and letting two things fall with different mass to test if gravity acts on every object the same.
My question is, does somebody know the name of this famous person, who conducted the experiment? I can't remember it.
untagged
asked 9 hours ago
MaximMaxim
1213
$endgroup$
In a German interview some physicists were asked, what they would ask Einstein, if he were alive today. One of them wanted to know how Einstein came up with the idea of the equivalence principle, that inertial mass is the same as gravitational mass. Correct me if I'm wrong, but I always believed that was known way before Einstein. And I have an experiment in mind where one famous guy standing on a leaning tower and letting two things fall with different mass to test if gravity acts on every object the same.
My question is, does somebody know the name of this famous person, who conducted the experiment? I can't remember it.
untagged
untagged
asked 9 hours ago
MaximMaxim
1213
asked 9 hours ago
MaximMaxim
1213
asked 9 hours ago
MaximMaxim
1213
asked 9 hours ago
MaximMaxim
1213
asked 9 hours ago
MaximMaxim
1213
1213
migrated from physics.stackexchange.com 5 hours ago
This question came from our site for active researchers, academics and students of physics.
migrated from physics.stackexchange.com 5 hours ago
This question came from our site for active researchers, academics and students of physics.
4
$begingroup$
Galileo Galilei, see en.wikipedia.org/wiki/Galileo_Galilei
$endgroup$
– hyportnex
9 hours ago
3
$begingroup$
"And I have an experiment in mind where one famous guy standing on a church and letting two things fall with different mass to test if gravity acts on every object the same." I think you mean Galileo Galilei.
$endgroup$
– Gert
9 hours ago
2
$begingroup$
I'm voting to close this question as off-topic because it's about the history of physics, not physics primarily.
$endgroup$
– Gert
9 hours ago
add a comment |
4
$begingroup$
Galileo Galilei, see en.wikipedia.org/wiki/Galileo_Galilei
$endgroup$
– hyportnex
9 hours ago
3
$begingroup$
"And I have an experiment in mind where one famous guy standing on a church and letting two things fall with different mass to test if gravity acts on every object the same." I think you mean Galileo Galilei.
$endgroup$
– Gert
9 hours ago
2
$begingroup$
I'm voting to close this question as off-topic because it's about the history of physics, not physics primarily.
$endgroup$
– Gert
9 hours ago
4
4
$begingroup$
Galileo Galilei, see en.wikipedia.org/wiki/Galileo_Galilei
$endgroup$
– hyportnex
9 hours ago
$begingroup$
Galileo Galilei, see en.wikipedia.org/wiki/Galileo_Galilei
$endgroup$
– hyportnex
9 hours ago
3
3
$begingroup$
"And I have an experiment in mind where one famous guy standing on a church and letting two things fall with different mass to test if gravity acts on every object the same." I think you mean Galileo Galilei.
$endgroup$
– Gert
9 hours ago
$begingroup$
"And I have an experiment in mind where one famous guy standing on a church and letting two things fall with different mass to test if gravity acts on every object the same." I think you mean Galileo Galilei.
$endgroup$
– Gert
9 hours ago
2
2
$begingroup$
I'm voting to close this question as off-topic because it's about the history of physics, not physics primarily.
$endgroup$
– Gert
9 hours ago
$begingroup$
I'm voting to close this question as off-topic because it's about the history of physics, not physics primarily.
$endgroup$
– Gert
9 hours ago
add a comment |
1 Answer
1
active
oldest
votes
$begingroup$
There are lots of different ways of stating the equivalence principle, and they're not all logically ... er ... equivalent to each other.
Names that come up in this connection, from before Einstein, are Galileo and Eotvos. Experiments that test the equality of gravitational and inertial mass are called Eotvos experiments.
Einstein's version of the equivalence principle is more radical than anything that Galileo or Newton envisioned. It entails throwing away the whole concept of a universal reference frame and instead defining inertial frames as local, free-falling frames. Previously, people had imagined that there was a frame of the "fixed stars," which was as good an approximation to an inertial frame as we would ever need. But according to relativity, observers in New York and Beijing can't even have the same frame of reference.
Taking the equivalence principle seriously also leads to the prediction of gravitational time dilation, which is something that nobody before Einstein had imagined.
answered 9 hours ago
Ben CrowellBen Crowell
1,681824
$endgroup$
add a comment |
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1 Answer
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1 Answer
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$begingroup$
There are lots of different ways of stating the equivalence principle, and they're not all logically ... er ... equivalent to each other.
Names that come up in this connection, from before Einstein, are Galileo and Eotvos. Experiments that test the equality of gravitational and inertial mass are called Eotvos experiments.
Einstein's version of the equivalence principle is more radical than anything that Galileo or Newton envisioned. It entails throwing away the whole concept of a universal reference frame and instead defining inertial frames as local, free-falling frames. Previously, people had imagined that there was a frame of the "fixed stars," which was as good an approximation to an inertial frame as we would ever need. But according to relativity, observers in New York and Beijing can't even have the same frame of reference.
Taking the equivalence principle seriously also leads to the prediction of gravitational time dilation, which is something that nobody before Einstein had imagined.
answered 9 hours ago
Ben CrowellBen Crowell
1,681824
$endgroup$
add a comment |
$begingroup$
There are lots of different ways of stating the equivalence principle, and they're not all logically ... er ... equivalent to each other.
Names that come up in this connection, from before Einstein, are Galileo and Eotvos. Experiments that test the equality of gravitational and inertial mass are called Eotvos experiments.
Einstein's version of the equivalence principle is more radical than anything that Galileo or Newton envisioned. It entails throwing away the whole concept of a universal reference frame and instead defining inertial frames as local, free-falling frames. Previously, people had imagined that there was a frame of the "fixed stars," which was as good an approximation to an inertial frame as we would ever need. But according to relativity, observers in New York and Beijing can't even have the same frame of reference.
Taking the equivalence principle seriously also leads to the prediction of gravitational time dilation, which is something that nobody before Einstein had imagined.
answered 9 hours ago
Ben CrowellBen Crowell
1,681824
$endgroup$
add a comment |
$begingroup$
There are lots of different ways of stating the equivalence principle, and they're not all logically ... er ... equivalent to each other.
Names that come up in this connection, from before Einstein, are Galileo and Eotvos. Experiments that test the equality of gravitational and inertial mass are called Eotvos experiments.
Einstein's version of the equivalence principle is more radical than anything that Galileo or Newton envisioned. It entails throwing away the whole concept of a universal reference frame and instead defining inertial frames as local, free-falling frames. Previously, people had imagined that there was a frame of the "fixed stars," which was as good an approximation to an inertial frame as we would ever need. But according to relativity, observers in New York and Beijing can't even have the same frame of reference.
Taking the equivalence principle seriously also leads to the prediction of gravitational time dilation, which is something that nobody before Einstein had imagined.
answered 9 hours ago
Ben CrowellBen Crowell
1,681824
$endgroup$
There are lots of different ways of stating the equivalence principle, and they're not all logically ... er ... equivalent to each other.
Names that come up in this connection, from before Einstein, are Galileo and Eotvos. Experiments that test the equality of gravitational and inertial mass are called Eotvos experiments.
Einstein's version of the equivalence principle is more radical than anything that Galileo or Newton envisioned. It entails throwing away the whole concept of a universal reference frame and instead defining inertial frames as local, free-falling frames. Previously, people had imagined that there was a frame of the "fixed stars," which was as good an approximation to an inertial frame as we would ever need. But according to relativity, observers in New York and Beijing can't even have the same frame of reference.
Taking the equivalence principle seriously also leads to the prediction of gravitational time dilation, which is something that nobody before Einstein had imagined.
answered 9 hours ago
Ben CrowellBen Crowell
1,681824
answered 9 hours ago
Ben CrowellBen Crowell
1,681824
answered 9 hours ago
Ben CrowellBen Crowell
1,681824
answered 9 hours ago
Ben CrowellBen Crowell
1,681824
1,681824
add a comment |
add a comment |
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4
$begingroup$
Galileo Galilei, see en.wikipedia.org/wiki/Galileo_Galilei
$endgroup$
– hyportnex
9 hours ago
3
$begingroup$
"And I have an experiment in mind where one famous guy standing on a church and letting two things fall with different mass to test if gravity acts on every object the same." I think you mean Galileo Galilei.
$endgroup$
– Gert
9 hours ago
2
$begingroup$
I'm voting to close this question as off-topic because it's about the history of physics, not physics primarily.
$endgroup$
– Gert
9 hours ago