Gravity - Revision history

Jmdonev: 1 revision imported

2021-10-15T19:13:38Z

1 revision imported

← Older revision	Revision as of 19:13, 15 October 2021
(No difference)

energy>Jmdonev at 18:55, 27 May 2021

2021-05-27T18:55:04Z

Jmdonev: 1 revision imported

2017-08-29T01:46:45Z

1 revision imported

← Older revision	Revision as of 01:46, 29 August 2017
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Jmdonev at 22:10, 14 July 2017

2017-07-14T22:10:45Z

← Older revision		Revision as of 22:10, 14 July 2017
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	[[Category:Done ~~2016~~-04-30]]		[[Category:Done 2017-07-01]]
	[[Category:Phets]]		[[Category:Phets]]
	<onlyinclude>The gravitational force (also referred to simply as gravity) is the force that pulls all the masses in the universe together.</onlyinclude> All masses attract other masses according to Newton's law of universal gravitation:		<onlyinclude>The gravitational force (also referred to simply as gravity) is the force that pulls all the masses in the universe together.</onlyinclude> All masses attract other masses according to Newton's law of universal gravitation:

	<m>F = \frac{G m_1 m_2}{r^{2}}</m>		<math>F = \frac{G m_1 m_2}{r^{2}}</math>

	*~~<m>~~F~~</m>~~ is the force between the masses		*''F'' is the force between the masses
	*~~<m>~~G~~</m>~~ is gravitational constant and is to 6.67 x 10<sup>-11</sup> [[newton\|N]] [[meter\|m]]<sup>2</sup>/[[kilogram\|kg]]<sup>2</sup>		*''G'' is gravitational constant and is to 6.67 x 10<sup>-11</sup> [[newton\|N]] [[meter\|m]]<sup>2</sup>/[[kilogram\|kg]]<sup>2</sup>
	*<m>~~m_1~~</m> and <m>~~m_2~~</m> are the masses of the two objects (in [[kilogram]]s)		*''m''<sub>1</sub> and ''m''<sub>2</sub> are the masses of the two objects (in [[kilogram]]s)
	*~~<m>~~r~~</m>~~ is the distance between the masses (in [[meter]]s)		*''r'' is the distance between the masses (in [[meter]]s)

	The gravitational force acts between all objects that have mass. It always attracts objects together, and although it is the weakest of the four [[fundamental force]]s, gravity has an infinite range. The force of gravity pulls us towards Earth, causing objects to fall. When objects have the ability to fall, that's called [[gravitational potential energy]]. [[Hydropower]] and [[tidal power]] are [[primary energy]] sources that take advantage of the gravitational force to generate useful [[work]].		The gravitational force acts between all objects that have mass. It always attracts objects together, and although it is the weakest of the four [[fundamental force]]s, gravity has an infinite range. The force of gravity pulls us towards Earth, causing objects to fall. When objects have the ability to fall, that's called [[gravitational potential energy]]. [[Hydropower]] and [[tidal power]] are [[primary energy]] sources that take advantage of the gravitational force to generate useful [[work]].

	Unless someone is taking very precise measurements in a lab (see for example [http://physwiki.ucdavis.edu/Fundamentals/02._Conservation_of_Energy/2.3_Gravitational_Phenomena Cavendish's famous experiment] which determined the [[gravitational constant]], G), the force of gravity must include '''only''' really big objects (like the [[sun]], the moon or a planet) to be noticeable. The PhET simulation below shows how small gravitational forces are between human sized objects.		Unless someone is taking very precise measurements in a lab (see for example [http://physwiki.ucdavis.edu/Fundamentals/02._Conservation_of_Energy/2.3_Gravitational_Phenomena Cavendish's famous experiment] which determined the [[gravitational constant]], ''G''), the force of gravity must include '''only''' really big objects (like the [[sun]], the moon or a planet) to be noticeable. The PhET simulation below shows how small gravitational forces are between human sized objects.

	The gravitational force is an example of an [[inverse square law]], meaning that the force drops with the square of the distance. This means that if the distance is doubled the gravitational attraction is four times less. Differences in gravitational forces from the moon acting on one side of the Earth, the center, and the other side of the Earth lead to [[tidal force]]s.		The gravitational force is an example of an [[inverse square law]], meaning that the force drops with the square of the distance. This means that if the distance is doubled the gravitational attraction is four times less. Differences in gravitational forces from the moon acting on one side of the Earth, the center, and the other side of the Earth lead to [[tidal force]]s.

Jmdonev: 1 revision imported: From the summer

2016-09-17T22:29:18Z

1 revision imported: From the summer

← Older revision	Revision as of 22:29, 17 September 2016
(No difference)

Jmdonev at 22:43, 8 March 2016

2016-03-08T22:43:35Z

← Older revision		Revision as of 22:43, 8 March 2016
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	[[Category:Done ~~2015~~-09-05]]		[[Category:Done 2016-04-30]]
	[[Category:Phets]]		[[Category:Phets]]
	<onlyinclude>The gravitational force (also referred to simply as gravity) is the force that pulls all the masses in the universe together.</onlyinclude> All masses attract other masses according to Newton's law of universal gravitation:		<onlyinclude>The gravitational force (also referred to simply as gravity) is the force that pulls all the masses in the universe together.</onlyinclude> All masses attract other masses according to Newton's law of universal gravitation:
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	The gravitational force acts between all objects that have mass. It always attracts objects together, and although it is the weakest of the four [[fundamental force]]s, gravity has an infinite range. The force of gravity pulls us towards Earth, causing objects to fall. When objects have the ability to fall, that's called [[gravitational potential energy]]. [[Hydropower]] and [[tidal power]] are [[primary energy]] sources that take advantage of the gravitational force to generate useful [[work]].		The gravitational force acts between all objects that have mass. It always attracts objects together, and although it is the weakest of the four [[fundamental force]]s, gravity has an infinite range. The force of gravity pulls us towards Earth, causing objects to fall. When objects have the ability to fall, that's called [[gravitational potential energy]]. [[Hydropower]] and [[tidal power]] are [[primary energy]] sources that take advantage of the gravitational force to generate useful [[work]].

	Unless someone is taking very precise measurements in a lab (see for example [http://physwiki.ucdavis.edu/Fundamentals/02._Conservation_of_Energy/2.3_Gravitational_Phenomena Cavendish's famous experiment] which determined the [[gravitational constant]], G), the force of gravity must include '''only''' really big ~~object~~ (like the [[sun]], the moon or a planet) to be noticeable. ~~This means that while a person is gravitationally attracted to a fudge brownie, the~~ gravitational ~~attraction is so small (less than the weight of an eyelash) that it would take very careful measurements to notice it at all~~.		Unless someone is taking very precise measurements in a lab (see for example [http://physwiki.ucdavis.edu/Fundamentals/02._Conservation_of_Energy/2.3_Gravitational_Phenomena Cavendish's famous experiment] which determined the [[gravitational constant]], G), the force of gravity must include '''only''' really big objects (like the [[sun]], the moon or a planet) to be noticeable. The PhET simulation below shows how small gravitational forces are between human sized objects.

	The gravitational force is an example of an [[inverse square law]], meaning that the force drops with the square of the distance. This means that if the distance is doubled the gravitational attraction is four times less. Differences in gravitational forces from the moon acting on one side of the Earth, the center, and the other side of the Earth lead to [[tidal force]]s.		The gravitational force is an example of an [[inverse square law]], meaning that the force drops with the square of the distance. This means that if the distance is doubled the gravitational attraction is four times less. Differences in gravitational forces from the moon acting on one side of the Earth, the center, and the other side of the Earth lead to [[tidal force]]s.

J.williams: 1 revision imported

2015-09-03T18:21:54Z

1 revision imported

← Older revision	Revision as of 18:21, 3 September 2015
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Jmdonev at 20:53, 27 August 2015

2015-08-27T20:53:49Z

← Older revision		Revision as of 20:53, 27 August 2015
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	[[Category:Done 2015-01-15 ]] [[Category:Phets]]		[[Category:Done 2015-09-05]]
			[[Category:Phets]]
	<onlyinclude>The gravitational force (also referred to simply as gravity) is the force that pulls all the masses in the universe together.</onlyinclude> All masses attract other masses according to Newton's law of universal gravitation:		<onlyinclude>The gravitational force (also referred to simply as gravity) is the force that pulls all the masses in the universe together.</onlyinclude> All masses attract other masses according to Newton's law of universal gravitation:

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	The gravitational force acts between all objects that have mass. It always attracts objects together, and although it is the weakest of the four [[fundamental force]]s, gravity has an infinite range. The force of gravity pulls us towards Earth, causing objects to fall. When objects have the ability to fall, that's called [[gravitational potential energy]]. [[Hydropower]] and [[tidal power]] are [[primary energy]] sources that take advantage of the gravitational force to generate useful [[work]].		The gravitational force acts between all objects that have mass. It always attracts objects together, and although it is the weakest of the four [[fundamental force]]s, gravity has an infinite range. The force of gravity pulls us towards Earth, causing objects to fall. When objects have the ability to fall, that's called [[gravitational potential energy]]. [[Hydropower]] and [[tidal power]] are [[primary energy]] sources that take advantage of the gravitational force to generate useful [[work]].

	Unless someone is taking very precise measurements in a lab (see for example [http://physwiki.ucdavis.edu/Fundamentals/02._Conservation_of_Energy/2.3_Gravitational_Phenomena Cavendish's famous experiment] which determined the [[gravitational constant]], G), the force of gravity must include '''only''' really big object (like the [[sun]], the [[moon]] or a planet) to be noticeable. This means that while a person is gravitationally attracted to a fudge brownie, the gravitational attraction is so small (less than the weight of an eyelash) that it would take very careful measurements to notice it at all.		Unless someone is taking very precise measurements in a lab (see for example [http://physwiki.ucdavis.edu/Fundamentals/02._Conservation_of_Energy/2.3_Gravitational_Phenomena Cavendish's famous experiment] which determined the [[gravitational constant]], G), the force of gravity must include '''only''' really big object (like the [[sun]], the moon or a planet) to be noticeable. This means that while a person is gravitationally attracted to a fudge brownie, the gravitational attraction is so small (less than the weight of an eyelash) that it would take very careful measurements to notice it at all.

	The gravitational force is an example of an [[inverse square law]], meaning that the force drops with the square of the distance. This means that if the distance is doubled the gravitational attraction is four times less. Differences in gravitational forces from the moon acting on one side of the Earth, the center, and the other side of the Earth lead to [[tidal force]]s.		The gravitational force is an example of an [[inverse square law]], meaning that the force drops with the square of the distance. This means that if the distance is doubled the gravitational attraction is four times less. Differences in gravitational forces from the moon acting on one side of the Earth, the center, and the other side of the Earth lead to [[tidal force]]s.

J.williams: 1 revision imported

2015-08-26T21:31:09Z

1 revision imported

← Older revision	Revision as of 21:31, 26 August 2015
(No difference)

J.williams at 16:54, 12 August 2015

2015-08-12T16:54:39Z

New page

[[Category:Done 2015-01-15 ]] [[Category:Phets]]
<onlyinclude>The gravitational force (also referred to simply as gravity) is the force that pulls all the masses in the universe together.</onlyinclude> All masses attract other masses according to Newton's law of universal gravitation:

<m>F = \frac{G m_1 m_2}{r^{2}}</m>

*<m>F</m> is the force between the masses
*<m>G</m> is gravitational constant and is to 6.67 x 10<sup>-11</sup> [[newton|N]] [[meter|m]]<sup>2</sup>/[[kilogram|kg]]<sup>2</sup>
*<m>m_1</m> and <m>m_2</m> are the masses of the two objects (in [[kilogram]]s)
*<m>r</m> is the distance between the masses (in [[meter]]s)

The gravitational force acts between all objects that have mass. It always attracts objects together, and although it is the weakest of the four [[fundamental force]]s, gravity has an infinite range. The force of gravity pulls us towards Earth, causing objects to fall. When objects have the ability to fall, that's called [[gravitational potential energy]]. [[Hydropower]] and [[tidal power]] are [[primary energy]] sources that take advantage of the gravitational force to generate useful [[work]].

Unless someone is taking very precise measurements in a lab (see for example [http://physwiki.ucdavis.edu/Fundamentals/02._Conservation_of_Energy/2.3_Gravitational_Phenomena Cavendish's famous experiment] which determined the [[gravitational constant]], G), the force of gravity must include '''only''' really big object (like the [[sun]], the [[moon]] or a planet) to be noticeable. This means that while a person is gravitationally attracted to a fudge brownie, the gravitational attraction is so small (less than the weight of an eyelash) that it would take very careful measurements to notice it at all.

The gravitational force is an example of an [[inverse square law]], meaning that the force drops with the square of the distance. This means that if the distance is doubled the gravitational attraction is four times less. Differences in gravitational forces from the moon acting on one side of the Earth, the center, and the other side of the Earth lead to [[tidal force]]s.

At cosmological distances (much greater than the size of a galaxy) there is interesting current research on [http://science.nasa.gov/astrophysics/focus-areas/what-is-dark-energy/ dark energy] that shows that a previously unexpected repulsion happens with gravity at long distances, see [http://map.gsfc.nasa.gov/universe/uni_accel.html here]).

For more information on gravity please see [http://hyperphysics.phy-astr.gsu.edu/hbase/grav.html#grav here].

Below the Phet, there's a video from [https://www.youtube.com/user/scishow Scishow's] series on fundamental forces, this one is on gravity.

==Phet: Gravitational force==
The [http://phet.colorado.edu/ University of Colorado] has graciously allowed us to use the following Phet simulation. To get a physical intuition about how the law of gravity works, please explore the simulation below. Notice that even the biggest gravitational force below is still quite small compared to how much a person weighs (about 500-1000 N).

<html><iframe src="http://phet.colorado.edu/sims/html/gravity-force-lab/latest/gravity-force-lab_en.html
" width="800" height="600"></iframe></html>

<html>
<iframe width="816" height="459" src="//www.youtube.com/embed/yhG_ArxmwRM" frameborder="0" allowfullscreen></iframe>
</html>

The other videos look at the [[strong nuclear force]], [[weak nuclear force]], and [[electromagnetic force]]. Check out their [https://www.youtube.com/user/scishow youtube channel] for more videos like these! (a wonderful resource for curious people).
[[Category:Uploaded]]

← Older revision		Revision as of 18:55, 27 May 2021
Line 1:		Line 1:
	~~[[Category:Done 2017-07-01]]~~
	[[Category:Phets]]		[[Category:Phets]]
			[[Category:Done 2021-01-31]]
	<onlyinclude>The gravitational force (also referred to simply as gravity) is the force that pulls all the masses in the universe together.</onlyinclude> All masses attract other masses according to Newton's law of universal gravitation:		<onlyinclude>The gravitational force (also referred to simply as gravity) is the force that pulls all the masses in the universe together.</onlyinclude> All masses attract other masses according to Newton's law of universal gravitation:

Line 6:		Line 6:

	*''F'' is the force between the masses		*''F'' is the force between the masses
	*''G'' is gravitational constant and is to 6.67 x 10<sup>-11</sup> [[newton\|N]] [[meter\|m]]<sup>2</sup>/[[kilogram\|kg]]<sup>2</sup>		*''G'' is the gravitational constant and is 6.67 x 10<sup>-11</sup> [[newton\|N]] [[meter\|m]]<sup>2</sup>/[[kilogram\|kg]]<sup>2</sup>
	*''m''<sub>1</sub> and ''m''<sub>2</sub> are the masses of the two objects (in [[kilogram]]s)		*''m''<sub>1</sub> and ''m''<sub>2</sub> are the masses of the two objects (in [[kilogram]]s)
	*''r'' is the distance between the masses (in [[meter]]s)		*''r'' is the distance between the masses (in [[meter]]s)

	The gravitational force acts between all objects that have mass. It always attracts objects together, and although it is the weakest of the four [[fundamental force]]s, gravity has an infinite range. The force of gravity pulls us towards Earth, causing objects to fall. When objects have the ability to fall, that's called [[gravitational potential energy]]. [[Hydropower]] and [[tidal power]] are [[primary energy]] sources that take advantage of the gravitational force to generate useful [[work]].		The gravitational force acts between all objects that have mass. This force always attracts objects together, and although it is the weakest of the four [[fundamental force]]s, gravity has an infinite range. The force of gravity pulls us towards Earth, causing objects to fall. When objects have the ability to fall, that's called [[gravitational potential energy]]. [[Hydropower]] and [[tidal power]] are [[primary energy]] sources that take advantage of the gravitational force to generate useful [[work]].

	Unless someone is taking very precise measurements in a lab (see for example [http://physwiki.ucdavis.edu/Fundamentals/02._Conservation_of_Energy/2.3_Gravitational_Phenomena Cavendish's famous experiment] which determined the [[gravitational constant]], ''G''), the force of gravity must include '''only''' really big objects (like the [[sun]], the moon or a planet) to be noticeable. The PhET simulation below shows how small gravitational forces are between human sized objects.		Unless someone is taking very precise measurements in a lab (see for example [http://physwiki.ucdavis.edu/Fundamentals/02._Conservation_of_Energy/2.3_Gravitational_Phenomena Cavendish's famous experiment] which determined the [[gravitational constant]], ''G''), the force of gravity must include '''only''' really big objects (like the [[sun]], the moon or a planet) to be noticeable. The PhET simulation below shows how small gravitational forces are between human sized objects.
Line 20:		Line 20:
	For more information on gravity please see [http://hyperphysics.phy-astr.gsu.edu/hbase/grav.html#grav here].		For more information on gravity please see [http://hyperphysics.phy-astr.gsu.edu/hbase/grav.html#grav here].

	Below the ~~Phet~~, there's a video from [https://www.youtube.com/user/scishow Scishow's] series on fundamental forces, this one is on gravity.		Below the PhET, there's a video from [https://www.youtube.com/user/scishow Scishow's] series on fundamental forces, this one is on gravity.

	==~~Phet~~: Gravitational force==		==PhET: Gravitational force==
	The [http://phet.colorado.edu/ University of Colorado] has graciously allowed us to use the following ~~Phet~~ simulation. To get a physical intuition about how the law of gravity works, please explore the simulation below. Notice that even the biggest gravitational force below is still quite small compared to how much a person weighs (about 500-1000 N).		The [http://phet.colorado.edu/ University of Colorado] has graciously allowed us to use the following PhET simulation. To get a physical intuition about how the law of gravity works, please explore the simulation below. Notice that even the biggest gravitational force below is still quite small compared to how much a person weighs (about 500-1000 N).

	<html><iframe src="~~http~~://phet.colorado.edu/sims/html/gravity-force-lab/latest/gravity-force-lab_en.html		<html><iframe src="https://phet.colorado.edu/sims/html/gravity-force-lab/latest/gravity-force-lab_en.html
	" width="800" height="600"></iframe></html>		" width="800" height="600"></iframe></html>