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Topic: Static equilibrium

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Statics

Dynamic equilibrium

Statically determinate

Economic equilibrium

Dynamics (mechanics)

Force

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General equilibrium

Structural engineering

Lever

Exogenous

Torque

Beam (structure)

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	Statics - Wikipedia, the free encyclopedia
		Statics is the branch of physics that is concerned with physical systems that are in static equilibrium, that is, in a state where the relative positions of subsystems do not vary over time, or where components and structures are at rest under the action of external forces of equilibrium.
		When in static equilibrium, the system is either at rest or moving at constant velocity through its center of mass.
		Statics is thoroughly used in the analysis of structures, for instance in architectural and structural engineering.
	en.wikipedia.org /wiki/Statics (381 words)

	Mechanical equilibrium - Wikipedia, the free encyclopedia
		A system is in mechanical equilibrium when the sum of the forces, and torque, on each particle of the system is zero.
		A particle in mechanical equilibrium is neither undergoing linear nor rotational acceleration; however it could be translating or rotating at a constant velocity.
		A child sliding down a slide at constant speed would be in mechanical equilibrium, but not in static equilibrium.
	en.wikipedia.org /wiki/Static_equilibrium (501 words)

	USA Gymnastics Online: Technique: EQUILIBRIUM: BIOMECHANICAL IMPLICATIONS
		Static equilibrium is changed from frame A to B as the gymnast concentrically contracts the hip abductors of the right leg, resulting in an internal action force that translates to an external ground reaction force.
		Static equilibrium exists when the line of gravity is within the base of support and there is zero velocity.
		Static equilibrium does not exist when the CG and its corresponding line of gravity are outside the base of support; however, this is not the case with dynamic equilibrium.
	www.usa-gymnastics.org /publications/technique/1997/2/equilibrium.html (1689 words)

	Equilibrium - Open Encyclopedia (Site not responding. Last check: 2007-10-09)
		Chemical equilibrium, the state in which a chemical reaction proceeds at the same rate as its reverse reaction, resulting in no net change in the amount of each compound.
		Mechanical equilibrium, also known as static equilibrium, the state of a body at rest or in uniform motion in which the sum of all forces and torques acting on the body equals zero.
		Reflective equilibrium in ethics, a state in which the consequences of one's general principles are consistent with one's opinions about individual cases.
	open-encyclopedia.com /Equilibrium (403 words)

	General equilibrium - FreeEncyclopedia (Site not responding. Last check: 2007-10-09)
		Static equilibrium can also be used to mean a situation in which there are no capital goods, so all goods are traded at the same time and none are carried over to later time periods.
		Static equilibrium was used in the analysis of classical economists, such as David Ricardo, and forms the basis of marxist theories of value.
		Proponents of dynamic equilibrium models would contest that static equilibrium is totally unrealistic for the modern world, where the economy is clearly not in a steady state.
	openproxy.ath.cx /ge/General_equilibrium.html (848 words)

	Equilibrium and Statics
		Objects at equilibrium must have an acceleration of 0 m/s/s (this extends from Newton's first law of motion), yet that does not mean the object is at rest.
		In the "Equilibrium Lab," the state of an object was analyzed in terms of the forces acting upon the object.
		This is what we expected - since the object was at equilibrium, the net force (vector sum of all the forces) should be 0 N. Another way of determining the net force (vector sum of all the forces) involves using the trigonometric functions to resolve each force into its horizontal and vertical components.
	www.glenbrook.k12.il.us /gbssci/phys/Class/vectors/u3l3c.html (1504 words)

	The Physics Classroom
		If an object is at rest and is in a state of equilibrium, then we would say that it is at "static equilibrium." "Static" means stationary or at rest.
		The above analysis of the forces acting upon an object in equilibrium is commonly used to analyze situations involving objects at static equilibrium.
		The picture is in a state of equilibrium (no judgments are made concerning the state of the subject in the picture), and thus all the forces acting upon the picture must be balanced.
	www.physicsclassroom.com /Class/vectors/U3L3c.html (1728 words)

	Lecture 6: Equilibrium
		In order to put the system back into equilibrium the child on the left had to move backwards along the board until she was far away.
		Another example of a state of equilibrium is the game of "tug-of-war." A rope is pulled taut between two teams; each hopes to pull with at least a force that equals the force imposed by the opposite team.
		Every structure that can be seen to remain standing on a daily basis is in equilibrium; it is at rest and each of its members, combination of its members or any part of a member that is supporting a load, are also at rest.
	web.mit.edu /afs/athena.mit.edu/course/4/4.440/1_lectures/1_lecture6/1_lecture6.html (912 words)

	Equilibrium and Elasticity (Site not responding. Last check: 2007-10-09)
		Static equilibrium principles are of most interest to folks who want to determine that their structures are going to stay where they put them.
		In the special case of static equilibrium, the velocity of the center of mass is also zero, as is the angular velocity.
		For an object subject to three forces to be in equilibrium, the sum of the three forces must be zero and their lines of action must intersect in a single point or not at all.
	www.mcasco.com /eande.html (5072 words)

	Equilibrium Article, Equilibrium Information (Site not responding. Last check: 2007-10-09)
		Chemical equilibrium, the state in which a chemical reaction proceeds at the same rate as its reverse reaction,resulting in no net change in the amount of each compound.
		Mechanical equilibrium, also known as static equilibrium, the state of a body at rest or in uniform motion in which the sum of all forces and torques acting onthe body equals zero.
		Reflective equilibrium in ethics, a state in whichthe consequences of one's general principles are consistent with one's opinions about individual cases.
	www.anoca.org /balance/state/equilibrium.html (427 words)

	Rotational vectors and angular momentum
		Static equilibrium: A body is in static equilibrium when it is stationary and the net external forces and torques are zero.
		A stable equilibrium is a point where the forces and torques are zero and a small displacement results in a restoring force.
		An unstable equilibrium is a point where the forces and torques are zero and a small displacement results in a force driving the system further from equilibrium.
	www.colorado.edu /physics/phys1110/phys1110_sp01/Notes/Chap14.htm (1523 words)

	AllRefer.com - equilibrium (Physics) - Encyclopedia
		A body in equilibrium at rest is said to be in static equilibrium.
		In thermodynamics, two bodies placed in contact with each other are said to be in thermal equilibrium when, after a sufficient length of time, their temperatures are equal.
		Chemical equilibrium refers to reversible chemical reactions in which the reactions involved are occurring in opposite directions at equal rates, so that no net change is observed.
	reference.allrefer.com /encyclopedia/E/equilbrm.html (391 words)

	Planetary Formation: Contents of Simulating the Capture Theory
		If a body is to remain in equilibrium throughout its collapse, it must be capable of contracting at such a rate that it is able to generate the energy lost from radiation, and also enough additional energy to raise the temperature sufficiently to maintain the pressure balance.
		It was concluded that if these were kept constant during the course of a simulation, the rate of collapse of the protoplanet, once it had reached a dynamic equilibrium configuration, was approximately constant, and was proportional to the square of the mass of the protoplanet, as predicted by Equation 5.5.
		However, once dynamic quasi-static equilibrium has set in, the profiles of the protoplanets throughout the rest of the experiment, are similar to those at the end of the experiment.
	www.droxley.freeserve.co.uk /node12_ct.html (7339 words)

	Equilibrium
		Static Equilibrium - An object is at rest and not accelerating.
		Of course, since velocities are relative we know that static equilibrium and dynamic equilibrium are really the same thing, depending on where you are standing when you observe the motion (or lack of it).
		Since the net force on this block is zero, it is in equilibrium - which means that it is not accelerating.
	www.batesville.k12.in.us /physics/PhyNet/Mechanics/Newton1/Statics.html (355 words)

	Static Equilibrium (Site not responding. Last check: 2007-10-09)
		This laboratory activity will demonstrate the conditions under which an object is held in static equilibrium.
		An object is defined to be in static equilibrium when it is nether undergoing a translational motion or a rotational motion.
		This means that four forces are acting on the beam to keep it in static equilibrium.
	physics.uwstout.edu /Univphys1/labs/static.htm (831 words)

	Statics-Equilibrium-Static equilibrium-Dynamic equilibrium-Conditions of equilibrium
		Statics is the branch of mechanics which deals with the study of bodies at rest under a number of forces, the equilibrium, conditions of equilibrium, types of equilibrium and torque etc.
		A body is said to be in equilibrium if it is at rest or moving with uniform velocity.
		To maintain the transitional equilibrium in a body the vector sum of all the forces acting on the body is equal to zero
	www.citycollegiate.com /staticsXa.htm (356 words)

	Static Equilibrium for a Particle
		Equilibrium equations for a particle: A particle is in equilibrium if the resultant of ALL forces acting on the particle is equal to zero
		Equilibrium equations in component form: In a rectangular coordinate system the equilibrium equations can be represented by three scalar equations:
		Frictionless pulleys: For a frictionless pulley in static equilibrium, the tension in the cable is the same on both sides of the pulley.
	em-ntserver.unl.edu /Negahban/em223/note5/note5.htm (129 words)

	Statics-Equilibrium-Static equilibrium-Dynamic equilibrium-Conditions of equilibrium
		Static is the branch of mechanics which deals with the study of bodies at rest under a number of forces, the equilibrium, conditions of equilibrium, types of equilibrium, torque etc.
		If the combined effect of all the forces acting on a body is zero and the body is in the state of rest then its equilibrium is termed as static equilibrium.
		In other words we can say that to maintain equilibrium the sum of all the forces acting along X-axis is zero and the sum of all the forces acting along Y-axis is zero.
	www.citycollegiate.com /staticsXIa.htm (325 words)

	PHSchool - AP* Lesson Plans
		Draw a free-body diagram representing all forces acting on an object that is in static equilibrium.
		The coefficient of static friction for the surfaces involved is known to be 0.25.
		With the system in static equilibrium, rope 1 is measured to make an angle of 60° with the ceiling and rope 2 makes an angle of 70° with respect to the wall.
	www.phschool.com /advanced/lesson_plans/phys_wilson_2000/week04.html (1024 words)

	Limits of Static equilibrium; pushing a brick (Site not responding. Last check: 2007-10-09)
		A classical example of the limits of static equilibrium is an object acted on by gravity and a normal force from a horizontal surface.
		To analyze static equilibrium it is convenient to choose the point of contact with the ground as the point of reference.
		As long as the center of mass point is on the side of the reference point where the brick is being pushed it supplies a torque opposite that of the pushing force and hence a static equilibrium is possible.
	www.pha.jhu.edu /~broholm/l22/node3.html (323 words)

	Static Equilibrium (Site not responding. Last check: 2007-10-09)
		In a previous lecture talked about mechanical equilibrium as a state in which an object does not accelerate (has constant velocity).
		If an object is large and rigid, equilibrium means more than zero acceleration -- it means no rotational acceleration.
		This lecture extends the concept of equilibrium to include rotational equilibrium as well as the translational equilibrium we considered earlier.
	physics.bgsu.edu /~stoner/p201/equil2/sld001.htm (60 words)

	Static Equilibrium - Makeup Lab
		Rather, this makeup lab involves the completion of a writing assignment which demonstrates your understanding of static equilibrium and the use of vector physics to analyze physical situations involving objects at equilibrium.
		The application must involve some real-world situation in which an object is being acted upon by forces at angles to the horizontal and vertical.
		Once you have identified an example of equilibrium, prepare a short, word-processed piece of writing in which you...
	www.glenbrook.k12.il.us /gbssci/Phys/makeups/vectors/u3l8.html (452 words)

	PHYS 1101 Torque & Static Equilibrium Solutions (Site not responding. Last check: 2007-10-09)
		We solve Static Equilibrium problems by sketching the extended free-body diagram, an FBD where the location of the all forces are indicated so that torques can be calculated.
		The forces that we know are working on the boom are a normal from the pin, the weight which acts from the centre of mass, and the two tensions.
		The forces that we know are working on the ladder are the weight which acts from the centre of mass, the normal forces from the wall and floor, and friction.
	www.kwantlen.bc.ca /~mikec/P1101_Solutions/CM_StaticEq/P1101_06_SolutionsOLD.htm (2838 words)

	Chapter 13
		For an object to be in rotational equilibrium the vector sum of the external torques that act on the body, measured about any possible point, must equal zero.
		For an object to be in translational equilibrium, the vector sum of all the external forces that act on the body must also equal zero.
		This is used in static equilibrium problems to condense the forces (due to gravity) into one point.
	www.has.vcu.edu /new-phy/chapter_13.htm (833 words)

	EQUILIBRIUM AND ELASTICITY
		An object that is supported at its center of gravity will be in static equilibrium, independent of the orientation of the object.
		We conclude that for a body to be in equilibrium, its center of mass must coincide with its center of gravity.
		We conclude that the system can not be in equilibrium if the center of mass of the top brick is located to the right of the edge of the bottom brick.
	teacher.nsrl.rochester.edu /phy121/LectureNotes/Chapter13/Chapter13.html (876 words)

	[No title] (Site not responding. Last check: 2007-10-09)
		Theory: The conditions for static equilibrium of a rigid body are: (1) the vector sum of the forces acting the body must be zero and (2) the vector sum of torques acting the body must be zero.
		The first condition, (F = 0, is concerned with transitional equilibrium and ensures the object is at a particular location (not moving linearly) or that is moving with uniform linear velocity (Newton’s first law of motion).
		To be in static equilibrium, a rigid body must also be in rotational static equilibrium.
	physics.berea.edu /~king/Teaching/PHY315/Labs/Lab5.doc (546 words)

	CVGS Physics Unit 7
		The important concept of a moment of force or torque is introduced in consideration of the twisting (rotational equilibrium) of static bodies.
		Solve problems of various equilibrium systems using the two governing principles of static equilibrium and free-body diagrams.
		Analyze static equilibrium of extended bodies, identifying degree of equilibrium (stable, unstable, or neutral) and explaining the extended body’s stability and balance.
	www.cvgs.k12.va.us /curric/physics/7.htm (203 words)

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