Acceleration - Revision history

SamHB: /* External links */ Fix categories.

2017-04-08T16:13:35Z

‎External links: Fix categories.

FredericBernard: recatogorize to mechanics

2017-04-06T12:12:04Z

recatogorize to mechanics

at 14:02, September 8, 2016

2016-09-08T14:02:01Z

DavidB4-bot: clean up & uniformity

2016-07-13T00:55:40Z

clean up & uniformity

Aschlafly at 03:11, September 8, 2011

2011-09-08T03:11:23Z

Johnbclarke: clean up

2011-09-08T02:46:19Z

clean up

Sarahfbush: ballsack

2011-09-08T02:45:37Z

ballsack

Jma at 02:49, July 9, 2010

2010-07-09T02:49:03Z

Joaquín Martínez: Reverted edits by Anonymizator (Talk) to last version by RodWeathers

2010-01-24T16:57:58Z

Reverted edits by Anonymizator (Talk) to last version by RodWeathers

Anonymizator: Replaced content with 'Page corrected by Anon'

2010-01-24T14:16:01Z

Replaced content with 'Page corrected by Anon'

← Older revision		Revision as of 16:13, April 8, 2017
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		+	[[Category:Physics]]
	[[Category:Mechanics]]		[[Category:Mechanics]]

← Older revision		Revision as of 12:12, April 6, 2017
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−	~~[[Category:Physics]]~~
	[[Category:Mechanics]]		[[Category:Mechanics]]

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-'''Acceleration''' is the rate of change of an object's [[velocity]].<ref>Wile, Dr. Jay L. ''Exploring Creation With Physical Science''. Apologia Educational Ministries, Inc. 1999, 2000</ref> More precisely, it is defined as the derivative of [[velocity]] over time, and is a vector. For an object to undergo an acceleration, a [[force]] needs to be exerted on the object. An example is a falling object on [[Earth]], which is subject to a [[gravity|gravitational force]]. The resulting acceleration ''g'' is independent of the mass of the object, and is approximately 9.81 [[meter]]s per [[second]] per [[second]] near the Earth's surface.<ref>Marcelo Alonso and Edward J. Finn, ''Fundamental University Physics'', Addison-Wesley.</ref>
+'''Acceleration''' is the rate of change of an object's [[velocity]].<ref>Wile, Dr. Jay L. ''Exploring Creation With Physical Science''. Apologia Educational Ministries, Inc. 1999, 2000</ref> More precisely, it is defined as the derivative of [[velocity]] over time, and is a vector. For an object to undergo an acceleration, a [[force]] needs to be exerted on the object. An example is a falling object on [[Earth]], which is subject to a [[gravity|gravitational force]]. The resulting acceleration ''g'' is independent of the mass of the object, and is approximately 9.81 [[meter]]s per [[second]] squared near the Earth's surface.<ref>Marcelo Alonso and Edward J. Finn, ''Fundamental University Physics'', Addison-Wesley.</ref>
-According to Newton's Second Law of Motion, calculation of acceleration is done with the formula <math>\vec F=m \vec a</math>, where F=force and is measured in Newtons, m=mass and is measured in kilograms, and a=acceleration and is measured in meters per second squared. Using the formula we can find that <math> \vec a=\frac{\vec F}{m}</math>.
+According to Newton's Second Law of Motion, calculation of acceleration is done with the formula <math>\vec F=m \vec a</math>, where F is the [[force]], measured in Newtons, m is the [[mass]], measured in kilograms and a is the acceleration, measured in meters per second squared. Using the formula we can see that <math> \vec a=\frac{\vec F}{m}</math>. This formula is only correct when the mass is constant.
-In the case of straight trajectory, if an object's acceleration and [[velocity]] have the same direction, the object is gaining [[speed]].  If the acceleration and velocity have opposite directions, the object is losing speed.  If the acceleration is zero, then the object is either at rest or travelling in a straight line at constand speed.
+In the case of straight trajectory, if an object's acceleration and [[velocity]] have the same direction, the object is gaining [[speed]].  If the acceleration and velocity have opposite directions, the object is losing speed.  If the acceleration is zero, then the object is either at rest or travelling in a straight line at constant speed. This is Newton's first law that the [[velocity]] of an object is constant if the '''net''' [[force]] acting on it is zero.
-In case of a curvilinear trajectory, there is an acceleration, even if the speed of the object is constant.  This is because the ''direction'' of the object's velocity changes if the path is curved.  And whenever there is a change in velocity, there is an acceleration, since acceleration is the change in velocity with respect to time.
+In case of a curvilinear trajectory, there is an acceleration, even if the speed of the object is constant.  This is because the ''direction'' of the object's velocity changes if the path is curved.  And whenever there is a change in [[velocity]], there is an acceleration, since acceleration is the change in velocity with respect to time. An example of this is [[circular motion]], where the speed of a particle is constant, but it is accelerating towards the centre of its circular trajectory.
 ==References==

@@ Line 1: / Line 1: @@
-'''Acceleration''' is the rate of change of an object's [[velocity]].<ref>Wile, Dr. Jay L. ''Exploring Creation With Physical Science''. Apologia Educational Ministries, Inc. 1999, 2000</ref>. More precisely, it is defined as the derivative of [[velocity]] over time, and is a vector. For an object to undergo an acceleration, a [[force]] needs to be exerted on the object. An example is a falling object on [[Earth]], which is subject to a [[gravity|gravitational force]]. The resulting acceleration ''g'' is independent of the mass of the object, and is approximately 9.81 [[meter]]s per [[second]] per [[second]] near the Earth's surface<ref>Marcelo Alonso and Edward J. Finn, ''Fundamental University Physics'', Addison-Wesley.</ref>.
+'''Acceleration''' is the rate of change of an object's [[velocity]].<ref>Wile, Dr. Jay L. ''Exploring Creation With Physical Science''. Apologia Educational Ministries, Inc. 1999, 2000</ref> More precisely, it is defined as the derivative of [[velocity]] over time, and is a vector. For an object to undergo an acceleration, a [[force]] needs to be exerted on the object. An example is a falling object on [[Earth]], which is subject to a [[gravity|gravitational force]]. The resulting acceleration ''g'' is independent of the mass of the object, and is approximately 9.81 [[meter]]s per [[second]] per [[second]] near the Earth's surface.<ref>Marcelo Alonso and Edward J. Finn, ''Fundamental University Physics'', Addison-Wesley.</ref>
 According to Newton's Second Law of Motion, calculation of acceleration is done with the formula <math>\vec F=m \vec a</math>, where F=force and is measured in Newtons, m=mass and is measured in kilograms, and a=acceleration and is measured in meters per second squared. Using the formula we can find that <math> \vec a=\frac{\vec F}{m}</math>.
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 [[Category:Physics]]
-[[Category:Mechanics ]]
+[[Category:Mechanics]]

← Older revision		Revision as of 03:11, September 8, 2011
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−	~~asdf~~	+	'''Acceleration''' is the rate of change of an object's [[velocity]].<ref>Wile, Dr. Jay L. ''Exploring Creation With Physical Science''. Apologia Educational Ministries, Inc. 1999, 2000</ref>. More precisely, it is defined as the derivative of [[velocity]] over time, and is a vector. For an object to undergo an acceleration, a [[force]] needs to be exerted on the object. An example is a falling object on [[Earth]], which is subject to a [[gravity\|gravitational force]]. The resulting acceleration ''g'' is independent of the mass of the object, and is approximately 9.81 [[meter]]s per [[second]] per [[second]] near the Earth's surface<ref>Marcelo Alonso and Edward J. Finn, ''Fundamental University Physics'', Addison-Wesley.</ref>.

−	~~ballsack~~	+	According to Newton's Second Law of Motion, calculation of acceleration is done with the formula <math>\vec F=m \vec a</math>, where F=force and is measured in Newtons, m=mass and is measured in kilograms, and a=acceleration and is measured in meters per second squared. Using the formula we can find that <math> \vec a=\frac{\vec F}{m}</math>.
		+
		+	In the case of straight trajectory, if an object's acceleration and [[velocity]] have the same direction, the object is gaining [[speed]]. If the acceleration and velocity have opposite directions, the object is losing speed. If the acceleration is zero, then the object is either at rest or travelling in a straight line at constand speed.
		+
		+	In case of a curvilinear trajectory, there is an acceleration, even if the speed of the object is constant. This is because the ''direction'' of the object's velocity changes if the path is curved. And whenever there is a change in velocity, there is an acceleration, since acceleration is the change in velocity with respect to time.
		+
		+	==References==
		+	<references/>
		+
		+	[[Category:Physics]]
		+	[[Category:Mechanics ]]

← Older revision		Revision as of 02:46, September 8, 2011
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		+	asdf
		+
	ballsack		ballsack

← Older revision		Revision as of 16:57, January 24, 2010
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−	~~Page corrected by Anon~~	+	'''Acceleration''' is the rate of change of an object's [[velocity]].<ref>Wile, Dr. Jay L. ''Exploring Creation With Physical Science''. Apologia Educational Ministries, Inc. 1999, 2000</ref>. More precisely, it is defined as the derivative of [[velocity]] over time, and is a vector. For an object to undergo an acceleration, a [[force]] needs to be exerted on the object. An example is a falling object on [[Earth]], which is subject to a [[gravity\|gravitational force]]. The resulting acceleration ''g'' is independent of the mass of the object, and is approximately 9.81 [[meter]]s per [[second]] per [[second]] near the Earth's surface<ref>Marcelo Alonso and Edward J. Finn, ''Fundamental University Physics'', Addison-Wesley.</ref>.
		+
		+	According to Newton's Second Law of Motion, calculation of acceleration is done with the formula <math>\vec F=m \vec a</math>, where F=force and is measured in Newtons, m=mass and is measured in kilograms, and a=acceleration and is measured in meters per second squared. Using the formula we can find that <math> \vec a=\frac{\vec F}{m}</math>.
		+
		+	In the case of straight trajectory, if an object's acceleration and [[velocity]] have the same sign, the object is gaining [[speed]]. If acceleration and velocity have different signs, the object is losing speed. If [[velocity]] is [[zero]], acceleration is not necessarily zero. If acceleration is zero, velocity is not necessarily zero.
		+
		+	In case of a curvilinear trajectory, there is an acceleration, even if speed is constant.
		+
		+	==References==
		+	<references/>
		+
		+	[[Category:Physics]]
		+	[[Category:Mechanics ]]