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Mechanical Equilibrium
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Lecture 01 Mechanical Equilibrium: Dynamic and Static  Equilibrium
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Hewitt-Drew-it! PHYSICS 1. Equilibrium Rule  Hewitt-Drew-it!
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Example of Mechanical equilibrium with torque
Example of Mechanical equilibrium with torque
DATE: 2010/10/29::
7
Thermodynamics 34 : Mechanical Equilibrium and Ideal Gas Law
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[clipvidva]  สมดุลกล Mechanical Equilibrium Part3/5
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DATE: 2014/01/12::
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[clipvidva]  สมดุลกล Mechanical Equilibrium Part2/5
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10
Example of Mechanical equilibrium with torque #2
Example of Mechanical equilibrium with torque #2
DATE: 2010/10/29::
11
Mechanical Equilibrium
Mechanical Equilibrium
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12
[clipvidva]  สมดุลกล Mechanical Equilibrium Part4/5
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DATE: 2014/01/25::
13
Balancing Torques (mechanical equilibrium)
Balancing Torques (mechanical equilibrium)
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Lecture 01 Mechanical Equilibrium Problem Solving
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Doc Physics - Static Equilibrium, or What to do when nothing at all is happening
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[clipvidva]  สมดุลกล Mechanical Equilibrium Part5/5
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DATE: 2014/02/02::
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Mechanical Engineering: Particle Equilibrium (6 of 19) Worker Pulling on Mass Hanging from Crane
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DATE: 2015/06/19::
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Mechanical Engineering: Particle Equilibrium (11 of 19) Why are Pulleys a Mechanical Advantage?
Mechanical Engineering: Particle Equilibrium (11 of 19) Why are Pulleys a Mechanical Advantage?
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Mechanical Engineering: Particle Equilibrium (5 of 19) Beam and Cable Under Tension
Mechanical Engineering: Particle Equilibrium (5 of 19) Beam and Cable Under Tension
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Mechanical Engineering: Particle Equilibrium (7 of 19) Tension of Cables Attached to Hanging Object
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DATE: 2015/06/20::
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Mechanical Engineering: Particle Equilibrium (10 of 19) Cable Tension on a Gondola
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22
Mechanical Engineering: Particle Equilibrium (13 of 19) Pulleys and Mechanical Advantage
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DATE: 2015/06/23::
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Mechanical Engineering: Particle Equilibrium (4 of 19) Beam Under Tension
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24
Mechanical Engineering: Particle Equilibrium (2 of 19) Addition of Forces - Component
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Mechanical Engineering: Particle Equilibrium (1 of 19) Addition of Forces - Graphically
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26
Thermodynamic Equilibrium
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DATE: 2013/02/17::
27
Mechanical Engineering Thermodynamics - Lec 2, pt 5 of 5:  Quasi-Equilibrium Processes
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Mechanical Engineering: Particle Equilibrium (12 of 19) Pulleys and Mechanical Advantage
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DATE: 2015/06/23::
29
Mechanical Engineering: Particle Equilibrium (17 of 19) Determining Angles in 3-Dimension
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DATE: 2015/06/25::
30
Mechanical Engineering: Particle Equilibrium (15 of 19) What Are Direction Cosines?
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DATE: 2015/06/24::
31
Mechanical Engineering: Particle Equilibrium (19 of 19) Determining Tension in 3-D of a Hanging Disc
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DATE: 2015/06/27::
32
Mechanical Engineering: Particle Equilibrium (3 of 19) Net Force = 0
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33
Mechanical Engineering: Particle Equilibrium (8 of 19) Attached Beam Under Compression
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DATE: 2015/06/20::
34
Mechanical Engineering: Particle Equilibrium (9 of 19) Forces on a Bracket
Mechanical Engineering: Particle Equilibrium (9 of 19) Forces on a Bracket
DATE: 2015/06/20::
35
3.1 Equilibrium | Physics
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DATE: 2014/07/06::
36
Thermal Equilibrium
Thermal Equilibrium
DATE: 2010/05/06::
37
Mechanical Engineering: Particle Equilibrium (16 of 19) Determining Angles in 3-Dimension
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DATE: 2015/06/25::
38
Mechanical Engineering: Particle Equilibrium (18 of 19) Determining Angles & Tension in 3-Dimension
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DATE: 2015/06/26::
39
Mechanical Engineering: Particle Equilibrium (14 of 19) Vectors in 3-Dimensions Explained
Mechanical Engineering: Particle Equilibrium (14 of 19) Vectors in 3-Dimensions Explained
DATE: 2015/06/24::
40
Sample Equilibrium Problem
Sample Equilibrium Problem
DATE: 2014/02/18::
41
Mechanics 1 (M1) - Statics in Equilibrium (1) - Introduction - Resolving Forces - AQA Edexcel OCR
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DATE: 2013/08/29::
42
Despite Exile - Equilibrium
Despite Exile - Equilibrium
DATE: 2013/12/05::
43
iron carbon phase diagram explanation for uptu mechanical engineers by IIT Kanpur
iron carbon phase diagram explanation for uptu mechanical engineers by IIT Kanpur
DATE: 2013/06/14::
44
The Cubli: a cube that can jump up, balance, and
The Cubli: a cube that can jump up, balance, and 'walk'
DATE: 2013/12/17::
45
Experiment Physics - Mechanics: Equilibrium and Torque Game
Experiment Physics - Mechanics: Equilibrium and Torque Game
DATE: 2012/02/01::
46
Experiment Physics - Mechanics: Unstable Equilibrium #2
Experiment Physics - Mechanics: Unstable Equilibrium #2
DATE: 2012/02/01::
47
General conditions for equilibrium &  stability of thermodynamic systems
General conditions for equilibrium & stability of thermodynamic systems
DATE: 2014/01/14::
48
Coffee in space: International Space Station astronauts can enjoy espressos with zero-gravity cup
Coffee in space: International Space Station astronauts can enjoy espressos with zero-gravity cup
DATE: 2015/02/04::
49
Static Equilibrium and Triangle of Forces
Static Equilibrium and Triangle of Forces
DATE: 2010/03/31::
50
Mod-01 Lec-23 Burn Rate of Solid Propellants and Equilibrium pressure in Solid Propellants Rockets
Mod-01 Lec-23 Burn Rate of Solid Propellants and Equilibrium pressure in Solid Propellants Rockets
DATE: 2012/06/25::
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RESULTS [51 .. 101]
From Wikipedia, the free encyclopedia
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Force diagram showing the forces acting on an object at rest on a surface. The normal force N is equal and opposite to the gravitational force mg so the net force is zero. Consequently the object is in a state of static mechanical equilibrium.

A mechanical equilibrium is a state in which a momentum coordinate of a particle, rigid body, or dynamical system is conserved. Usually this refers to linear momentum. For instance, a linear mechanical equilibrium would be a state in which the linear momentum of the system is conserved as the net force on the object is zero.[1][2] In the specific case that the linear momentum is zero and conserved, the system can be said to be in a static equilibrium[3][4] although for any system in which the linear momentum is conserved, it is possible to shift to a non-inertial reference frame that is stationary with respect to the object.

In a rotational mechanical equilibrium the angular momentum of the object is conserved and the net torque is zero.[2] More generally in conservative systems, equilibrium is established at a point in configuration space where the gradient with respect to the generalized coordinates of the potential energy is zero.

Stability[edit]

An important property of systems at mechanical equilibrium is their stability. In the terminology of elementary calculus, a system at mechanical equilibrium is at a critical point in potential energy where the first derivative is zero. To determine whether or not the system is stable or unstable, we apply the second derivative test:

Unstable equilibria
  • Second derivative < 0: The potential energy is at a local maximum, which means that the system is in an unstable equilibrium state. If the system is displaced an arbitrarily small distance from the equilibrium state, the forces of the system cause it to move even farther away.
Stable equilibria
  • Second derivative > 0: The potential energy is at a local minimum. This is a stable equilibrium. The response to a small perturbation is forces that tend to restore the equilibrium. If more than one stable equilibrium state is possible for a system, any equilibria whose potential energy is higher than the absolute minimum represent metastable states.
Neutral equilibria
  • Second derivative = 0 or does not exist: The state is neutral to the lowest order and nearly remains in equilibrium if displaced a small amount. To investigate the precise stability of the system, higher order derivatives must be examined. The state is unstable if the lowest nonzero derivative is of odd order or has a negative value, stable if the lowest nonzero derivative is both of even order and has a positive value, and neutral if all higher order derivatives are zero. In a truly neutral state the energy does not vary and the state of equilibrium has a finite width. This is sometimes referred to as state that is marginally stable or in a state of indifference.

When considering more than one dimension, it is possible to get different results in different directions, for example stability with respect to displacements in the x-direction but instability in the y-direction, a case known as a saddle point. Generally an equilibrium is only referred to as stable if it is stable in all directions.

Examples[edit]

The special case of mechanical equilibrium of a stationary object is static equilibrium. A paperweight on a desk would be in static equilibrium. The minimal number of static equilibria of homogeneous, convex bodies (when resting under gravity on a horizontal surface) is of special interest. In the planar case, the minimal number is 4, while in three dimensions one can build an object with just one stable and one unstable balance point, this is called gomboc. A child sliding down a slide at constant speed would be in mechanical equilibrium, but not in static equilibrium (in the reference frame of the slide).

An example of mechanical equilibrium is a person trying to press a spring. He or she can push it up to a point after which it reaches a state where the force trying to compress it and the resistive force from the spring are equal, so the person cannot further press it. At this state the system will be in mechanical equilibrium. When the pressing force is removed the spring attains its original state.

See also[edit]

Notes and references[edit]

  1. ^ John L Synge & Byron A Griffith (1949). Principles of Mechanics (2nd ed.). McGraw-Hill. pp. 45–46. 
  2. ^ a b Beer FP, Johnston ER, Mazurek DF, Cornell PJ, and Eisenberg, ER. (2009) Vector Mechanics for Engineers: Statics and Dymanics. 9th ed. McGraw-Hill. p 158.
  3. ^ Herbert Charles Corben & Philip Stehle (1994). Classical Mechanics (Reprint of 1960 second ed.). Courier Dover Publications. p. 113. ISBN 0-486-68063-0. 
  4. ^ Lakshmana C. Rao, J. Lakshminarasimhan, Raju Sethuraman, Srinivasan M. Sivakumar (2004). Engineering Mechanics. PHI Learning Pvt. Ltd. p. 6. ISBN 81-203-2189-8. 

Further reading[edit]

  • Marion JB and Thornton ST. (1995) Classical Dynamics of Particles and Systems. Fourth Edition, Harcourt Brace & Company.
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