Galileo's Experiment: Mass of Gravity & Inertia

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Discussion Overview

The discussion revolves around Galileo's experiments related to gravity and inertia, specifically addressing how he concluded that the mass of gravity and inertia are identical. Participants explore the historical context and the implications of Galileo's findings, while also engaging in some light-hearted commentary about the mispronunciation of "Pisa" as "pizza."

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • Some participants describe Galileo's method of using balls of different weights rolling down an inclined plane, noting that all masses had the same acceleration.
  • One participant clarifies the distinction between weight and mass, stating that inertia is resistance to motion due to mass, while weight is the gravitational force acting on mass.
  • Another participant emphasizes that since both weight and inertia are proportional to mass, the effects cancel out, leading to all objects falling at the same rate.
  • There is a humorous exchange regarding the misinterpretation of "Pisa" as "pizza," with several participants expressing confusion about the relevance of pizza to the topic.
  • One participant requests a clearer rephrasing of the original question to better understand the answers provided.
  • A later reply discusses the balance of gravitational force and inertia, explaining that as mass increases, the resistance to acceleration also increases proportionally.

Areas of Agreement / Disagreement

Participants express differing levels of understanding regarding the explanations provided, with some finding the responses clear while others continue to seek clarification. The humorous side discussion about pizza does not contribute to resolving the main question, indicating a lack of consensus on the original inquiry.

Contextual Notes

Some participants appear to misunderstand the relationship between mass, weight, and inertia, which may affect their grasp of Galileo's conclusions. The discussion also includes informal commentary that diverts from the technical aspects of the topic.

somy
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a historical question!

I have a question about galileo's experiment on top of the pizza !
(maybe it seems a bit silly!)
Can anyone tell me how did he say from this experiment that:
mass of gravity and inertia are identical?
Thanks a lot.
Somy :smile:
 
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He simply made several balls of several weights rolling down on a inclined plane, and noticed all the mass had the same acceleration.

It seems easy today. The greatest achivement was to find an accurate mean to measure time.
 
somy said:
Can anyone tell me how did he say from this experiment that:
mass of gravity and inertia are identical?
From the way you phrased that ("mass of gravity") sounds like maybe you misunderstand the difference between weight and mass and inertia. Inertia is resistance to motion due to mass, weight is gravitational attraction due to mass. For rolling balls down an incline (or dropping them off the tower of Piza, which probably didn't happen), since weight is proportional to mass and inertia is proportional to mass, the change in mass cancels out and thus all objects fall (accelerate due to G) at the same rate.
 
:smile: :smile: :smile:
I could not figure out what pizza came here !
You gave me a good laugh. It is the city Pisa ! We dumb french call it "pise" (prononce like pizza, without the a)

thanks for the clarification russ_watters, which has been useful to me too !
 
humanino said:
:smile: :smile: :smile:
I could not figure out what pizza came here !
You gave me a good laugh. It is the city Pisa ! We dumb french call it "pise" (prononce like pizza, without the a)
D'oh. I knew it wasn't "pizza" - but that only got me halfway there. In English, it sounds almost exactly like pizza though.
 
I still can't figure out what has any of this got to do with pizza?
 
joyful55 said:
I still can't figure out what has any of this got to do with pizza?
There is a legend, probably false, that Galileo dropped objects off the leaning tower of Pisa to test his theory of gravity.
 
Dear guys:
I haven't got my answer yet.
Please stop discussing about pizza! and read my question one more time.
Thanks a lot.
somy
 
Please somy, rephrase your question. Russ_waters first post (#3) seems to me very clearly answering your question.
 
  • #10
joyful55 said:
I still can't figure out what has any of this got to do with pizza?
I agree. Pizza have nothing to do with the city Pisa. Pizza were invented in Milano way before Galileo in history :smile: :smile:

Damn : pizza fans, check this
The first known pizza shop was the Port 'Alba in Naples, which opened in 1830 and is still open today. The first pizzeria in North America was opened in 1905 by Gennaro Lombardi at 53 1/3 Spring Street in New York City.
 
  • #11
well, I didn't get the russ watters' answer.
(I'm a bit silly!)
 
  • #12
By dropping (or rolling) things, he put two opposing forces against one another; gravity would attempt to accelerate the objects, while inertia resisted that acceleration. By showing that objects of different mass fall at the same rate, he showed that, as mass increases, resistance to acceleration (inertia) increases by exactly the same amount as does the force of acceleration toward the ground (gravitation).
 
  • #13
somy said:
well, I didn't get the russ watters' answer.
(I'm a bit silly!)
If you didn't get Lurch's answer (which is similar to mine but phrased differently), could you rephrase your question or be more specific about what part you don't understand?
 

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