Kinetic energy - Revision history

Jmdonev: 1 revision imported

2021-09-27T00:02:48Z

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energy>Ethan.boechler at 20:07, 10 September 2021

2021-09-10T20:07:41Z

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	[[Category:Done 2018-06-15]]		[[Category:Done 2018-06-15]]
	[[category:physics concepts]]		[[category:physics concepts]]
			[[Category:Translated to French]]
			[[fr:Énergie cinétique]]
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			[[es:Energía cinética]]
	<onlyinclude>'''Kinetic energy''' is the energy of motion. This can be the motion of large objects ([[#Macroscopic kinetic energy\|macroscopic kinetic energy]]), or the movement of small atoms and molecules ([[#Microscopic kinetic energy\|microscopic kinetic energy]]).</onlyinclude> Macroscopic kinetic energy is "high quality" energy, while microscopic kinetic energy is more disordered and "low-quality."<ref>Wolfson, ''Energy, Environment and Climate,'' Second ed. New York, USA: W.W. Norton, 2010</ref>		<onlyinclude>'''Kinetic energy''' is the energy of motion. This can be the motion of large objects ([[#Macroscopic kinetic energy\|macroscopic kinetic energy]]), or the movement of small atoms and molecules ([[#Microscopic kinetic energy\|microscopic kinetic energy]]).</onlyinclude> Macroscopic kinetic energy is "high quality" energy, while microscopic kinetic energy is more disordered and "low-quality."<ref>Wolfson, ''Energy, Environment and Climate,'' Second ed. New York, USA: W.W. Norton, 2010</ref>

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	'''[[Tidal power]]''' harnesses the energy of moving water as it moves back and forth due to tides		'''[[Tidal power]]''' harnesses the energy of moving water as it moves back and forth due to tides

	===PhET: Energy ~~skate park~~===		===PhET: Energy Skate Park===
	The [http://phet.colorado.edu/ University of Colorado] has graciously allowed us to use the following PhET simulation. Explore this simulation to see how gravitational potential energy and kinetic energy go back and forth but keep mechanical energy the same. Notice how mechanical energy can be lost and turned into thermal energy, but the total amount of [[energy]] still stays the same:		The [http://phet.colorado.edu/ University of Colorado] has graciously allowed us to use the following PhET simulation. Explore this simulation to see how gravitational potential energy and kinetic energy go back and forth but keep mechanical energy the same. Notice how mechanical energy can be lost and turned into thermal energy, but the total amount of [[energy]] still stays the same:
	<html>		<html>

Jmdonev: 1 revision imported

2018-06-25T14:30:25Z

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Jmdonev at 19:46, 6 June 2018

2018-06-06T19:46:10Z

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	[[Category:Done ~~2017~~-07-01]]		[[Category:Done 2018-06-15]]
	[[category:physics concepts]]		[[category:physics concepts]]
	~~[[Category: Needs citations]]~~
	<onlyinclude>'''Kinetic energy''' is the energy of motion. This can be the motion of large objects ([[#Macroscopic kinetic energy\|macroscopic kinetic energy]]), or the movement of small atoms and molecules ([[#Microscopic kinetic energy\|microscopic kinetic energy]]).</onlyinclude> Macroscopic kinetic energy is "high quality" energy, while microscopic kinetic energy is more disordered and "low-quality."<ref>Wolfson, ''Energy, Environment and Climate,'' Second ed. New York, USA: W.W. Norton, 2010</ref>		<onlyinclude>'''Kinetic energy''' is the energy of motion. This can be the motion of large objects ([[#Macroscopic kinetic energy\|macroscopic kinetic energy]]), or the movement of small atoms and molecules ([[#Microscopic kinetic energy\|microscopic kinetic energy]]).</onlyinclude> Macroscopic kinetic energy is "high quality" energy, while microscopic kinetic energy is more disordered and "low-quality."<ref>Wolfson, ''Energy, Environment and Climate,'' Second ed. New York, USA: W.W. Norton, 2010</ref>

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	The [http://phet.colorado.edu/ University of Colorado] has graciously allowed us to use the following PhET simulation. Explore this simulation to see how gravitational potential energy and kinetic energy go back and forth but keep mechanical energy the same. Notice how mechanical energy can be lost and turned into thermal energy, but the total amount of [[energy]] still stays the same:		The [http://phet.colorado.edu/ University of Colorado] has graciously allowed us to use the following PhET simulation. Explore this simulation to see how gravitational potential energy and kinetic energy go back and forth but keep mechanical energy the same. Notice how mechanical energy can be lost and turned into thermal energy, but the total amount of [[energy]] still stays the same:
	<html>		<html>
	<iframe src="~~http~~://phet.colorado.edu/sims/html/energy-skate-park-basics/latest/energy-skate-park-basics_en.html" width="800" height="600"></iframe>		<iframe src="https://phet.colorado.edu/sims/html/energy-skate-park-basics/latest/energy-skate-park-basics_en.html" width="800" height="600"></iframe>
	</html>		</html>

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	<iframe src="~~http~~://phet.colorado.edu/sims/html/friction/latest/friction_en.html" width="800" height="600"></iframe>		<iframe src="https://phet.colorado.edu/sims/html/friction/latest/friction_en.html" width="800" height="600"></iframe>
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Jmdonev: 1 revision imported

2017-08-29T01:47:23Z

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Jmdonev at 22:24, 16 August 2017

2017-08-16T22:24:02Z

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	Kinetic energy is calculated using the following formula:		Kinetic energy is calculated using the following formula:

	<m>E = \frac{1}{2}mv^2</m>		<center><math>E = \frac{1}{2}mv^2</math></center>

	:::* ''E'' is energy, measured in [[joule]]s (J)		:::* ''E'' is energy, measured in [[joule]]s (J)

J.williams: 1 revision imported

2015-09-18T16:51:32Z

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Jmdonev at 20:54, 3 September 2015

2015-09-03T20:54:56Z

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	Some ways to harness macroscopic kinetic energy include:		Some ways to harness macroscopic kinetic energy include:

	'''[[Wind power]]''' harnesses the kinetic energy possessed by moving bodies of air (wind), converting it into [[electricity]]. Wind itself is created initially through complex patterns of changes in [[thermal energy]] as ~~our~~ atmosphere and ~~oceans~~ are heated and cooled by the sun.		'''[[Wind power]]''' harnesses the kinetic energy possessed by moving bodies of air ([[wind]]), converting it into [[electricity]]. Wind itself is created initially through complex patterns of changes in [[thermal energy]] as the [[atmosphere]] and [[ocean]]s are heated and cooled by the [[sun]]. (The sun actually doesn't cool objects, but the sun never shines on an object on Earth all the time!)

	'''[[Hydropower]]''' harnesses the kinetic energy of moving water as it falls (in a waterfall or hydroelectric dam)		'''[[Hydropower]]''' harnesses the kinetic energy of moving [[water]] as it falls (in a waterfall or hydroelectric dam)

	'''[[Tidal power]]''' harnesses the energy of moving water as it moves back and forth due to tides		'''[[Tidal power]]''' harnesses the energy of moving water as it moves back and forth due to tides
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	==Microscopic kinetic energy==		==Microscopic kinetic energy==

	[[Thermal energy]] (temperature) is a special type of kinetic energy. It is not the energy of a whole object itself moving - it is the total energy of motion, rotation, and vibration of the atoms and molecules inside an object. In a gas or gas mixture, like air, the motion (and rotation) of individual gas particles makes up this energy. In a solid, like a table, the thermal energy exists as vibration of atoms or molecules. Total thermal energy also includes some atomic forms of [[potential energy]], but the kinetic energy of particles is the easiest to focus on. The [[temperature]] of an object is determined by its total microscopic kinetic energy.		[[Thermal energy]] (temperature) is a special type of kinetic energy. It is not the energy of a whole object itself moving - it is the total energy of motion, rotation, and vibration of the atoms and molecules inside an object. In a [[gas]] or gas mixture, like [[air]], the motion (and rotation) of individual gas particles makes up this energy. In a [[solid]], like a table, the thermal energy exists as vibration of atoms or molecules. Total thermal energy also includes some atomic forms of [[potential energy]], but the kinetic energy of particles is the easiest to focus on. The [[temperature]] of an object is determined by its total microscopic kinetic energy.

	While not all of microscopic kinetic energy can be turned into useful work, a [[heat engine]] can get some of the thermal energy and turn it into useful work (although this is limited by the [[second law of thermodynamics]]).		While not all of microscopic kinetic energy can be turned into useful [[work]], a [[heat engine]] can get some of the thermal energy and turn it into useful work (although this is limited by the [[second law of thermodynamics]]).
	===PhET Simulation===		===PhET Simulation===
	The [http://phet.colorado.edu/ University of Colorado] has graciously allowed us to use the following PhET simulation. This simulation explores how macroscopic kinetic energy becomes microscopic kinetic energy:		The [http://phet.colorado.edu/ University of Colorado] has graciously allowed us to use the following PhET simulation. This simulation explores how macroscopic kinetic energy becomes microscopic kinetic energy:

J.williams: 1 revision imported

2015-08-26T21:31:14Z

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J.williams at 16:54, 12 August 2015

2015-08-12T16:54:53Z

New page

[[Category:Done 2015-04-01]]
[[category:physics concepts]]
[[Category: Needs citations]]
<onlyinclude>'''Kinetic energy''' is the energy of motion. This can be the motion of large objects ([[#Macroscopic kinetic energy|macroscopic kinetic energy]]), or the movement of small atoms and molecules ([[#Microscopic kinetic energy|microscopic kinetic energy]]).</onlyinclude> Macroscopic kinetic energy is "high quality" energy, while microscopic kinetic energy is more disordered and "low-quality."<ref>Wolfson, ''Energy, Environment and Climate,'' Second ed. New York, USA: W.W. Norton, 2010</ref>

There's a simulation to play with at [[potential energy]] that shows the interaction of gravitational potential energy, kinetic energy and spring energy. A simulation below shows how energy flows back and forth between kinetic energy and gravitational potential energy and another simulation further below shows how [[friction]] causes [[Kinetic energy#Macroscopic kinetic energy|macroscopic kinetic energy]] to become [[Kinetic energy#Microscopic kinetic energy|microscopic kinetic energy]].

[[Rotational kinetic energy]] is also a form of kinetic energy that comes from an object spinning.

==Macroscopic kinetic energy==

This is the most obvious form of [[energy]] as it is the easiest to observe. This is the energy possessed by moving objects. The larger an object is or the faster it moves, the more kinetic energy it has. The sum of [[potential energy]] and macroscopic kinetic energy is called [[mechanical energy]] and stays constant for a system when there are only [[conservative force]]s (no [[non-conservative force]]s).

Kinetic energy is calculated using the following formula:

<m>E = \frac{1}{2}mv^2</m>

:::* ''E'' is energy, measured in [[joule]]s (J)
:::* ''m'' is [[mass]], measured in [[kilogram]]s (kg)
:::* ''v'' is [[velocity]], measured in [[meters per second]] (m/s)

# The more mass a moving object has, the more kinetic energy it will possess at the same [[speed]]. A 2000 kg car moving at 14 m/s has twice as much kinetic energy as a 1000 kg car moving at an equivalent 14 m/s.
# Because the velocity term in this formula is squared, velocity has a much larger effect than mass does on kinetic energy. A car moving at twice the speed of another car of identical mass will have 2<sup>2</sup> or four times as much kinetic energy. A car moving at three times the base speed will have 3<sup>2</sup> or NINE times the original kinetic energy!

Some ways to harness macroscopic kinetic energy include:

'''[[Wind power]]''' harnesses the kinetic energy possessed by moving bodies of air (wind), converting it into [[electricity]]. Wind itself is created initially through complex patterns of changes in [[thermal energy]] as our atmosphere and oceans are heated and cooled by the sun.

'''[[Hydropower]]''' harnesses the kinetic energy of moving water as it falls (in a waterfall or hydroelectric dam)

'''[[Tidal power]]''' harnesses the energy of moving water as it moves back and forth due to tides

===PhET: Energy skate park===
The [http://phet.colorado.edu/ University of Colorado] has graciously allowed us to use the following PhET simulation. Explore this simulation to see how gravitational potential energy and kinetic energy go back and forth but keep mechanical energy the same. Notice how mechanical energy can be lost and turned into thermal energy, but the total amount of [[energy]] still stays the same:
<html>
<iframe src="http://phet.colorado.edu/sims/html/energy-skate-park-basics/latest/energy-skate-park-basics_en.html" width="800" height="600"></iframe>
</html>

==Microscopic kinetic energy==

[[Thermal energy]] (temperature) is a special type of kinetic energy. It is not the energy of a whole object itself moving - it is the total energy of motion, rotation, and vibration of the atoms and molecules inside an object. In a gas or gas mixture, like air, the motion (and rotation) of individual gas particles makes up this energy. In a solid, like a table, the thermal energy exists as vibration of atoms or molecules. Total thermal energy also includes some atomic forms of [[potential energy]], but the kinetic energy of particles is the easiest to focus on. The [[temperature]] of an object is determined by its total microscopic kinetic energy.

While not all of microscopic kinetic energy can be turned into useful work, a [[heat engine]] can get some of the thermal energy and turn it into useful work (although this is limited by the [[second law of thermodynamics]]).
===PhET Simulation===
The [http://phet.colorado.edu/ University of Colorado] has graciously allowed us to use the following PhET simulation. This simulation explores how macroscopic kinetic energy becomes microscopic kinetic energy:

<html>
<iframe src="http://phet.colorado.edu/sims/html/friction/latest/friction_en.html" width="800" height="600"></iframe>
</html>

To learn more about kinetic energy please see [http://hyperphysics.phy-astr.gsu.edu/hbase/ke.html#ke hyperphysics].

==References==
{{reflist}}
[[Category:Uploaded]]