1
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2
Lecture 01 Mechanical Equilibrium: Dynamic and Static  Equilibrium
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3
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4
Example of Mechanical equilibrium with torque
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DATE: 2010/10/29::
5
Mechanical Equilibrium
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DATE: 2013/11/11::
6
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7
Thermodynamics 34 : Mechanical Equilibrium and Ideal Gas Law
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8
[clipvidva]  สมดุลกล Mechanical Equilibrium Part2/5
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DATE: 2014/01/05::
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[clipvidva]  สมดุลกล Mechanical Equilibrium Part3/5
[clipvidva] สมดุลกล Mechanical Equilibrium Part3/5
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10
Example of Mechanical equilibrium with torque #2
Example of Mechanical equilibrium with torque #2
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11
[clipvidva]  สมดุลกล Mechanical Equilibrium Part5/5
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12
Mechanical Equilibrium
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13
[clipvidva]  สมดุลกล Mechanical Equilibrium Part4/5
[clipvidva] สมดุลกล Mechanical Equilibrium Part4/5
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14
Balancing Torques (mechanical equilibrium)
Balancing Torques (mechanical equilibrium)
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15
Doc Physics - Static Equilibrium, or What to do when nothing at all is happening
Doc Physics - Static Equilibrium, or What to do when nothing at all is happening
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16
Lecture 01 Mechanical Equilibrium Problem Solving
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17
Mechanical Engineering Thermodynamics - Lec 2, pt 5 of 5:  Quasi-Equilibrium Processes
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18
Thermodynamic Equilibrium
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19
3.1 Equilibrium | Physics
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20
Thermal Equilibrium
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21
Sample Equilibrium Problem
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22
Two Torque Examples
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23
Static equilibrium Meaning
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Despite Exile - Equilibrium
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25
Mechanics 1 (M1) - Statics in Equilibrium (1) - Introduction - Resolving Forces - AQA Edexcel OCR
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26
Experiment Physics - Mechanics: Equilibrium and Torque Game
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The Cubli: a cube that can jump up, balance, and
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28
Static Equilibrium and Triangle of Forces
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29
Experiment Physics - Mechanics: Unstable Equilibrium #2
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DATE: 2012/02/01::
30
Equilibrium variant
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DATE: 2012/06/27::
31
Saylor.org ME202: Kenneth Manning
Saylor.org ME202: Kenneth Manning's "Mechanics Introduction, Equilibrium"
DATE: 2011/08/23::
32
Mod-01 Lec-23 Iron-Carbon Phase Diagram
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DATE: 2014/01/06::
33
Equilibrium Equations and FBD- MECH 2322- Mechanics of Materials
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34
Enventive Software - Static Equilibrium Demo
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DATE: 2013/07/11::
35
Mod-01 Lec-19 Shifting Equilibrium and Frozen Flow in Nozzles
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DATE: 2012/06/25::
36
Engineering Mechanics Lec 20 Stability of Equilibrium
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DATE: 2014/10/03::
37
IBPH Ep. 7 Simple Harmonic Motion (Part 1) - Part 1 of 2
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DATE: 2010/11/07::
38
Tips and Tricks - Engineering Statics - solivng problems
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DATE: 2008/08/30::
39
Equilibrium of Rigid Body Problem 4.75 (Statics Tutorials)
Equilibrium of Rigid Body Problem 4.75 (Statics Tutorials)
DATE: 2011/10/12::
40
Oscillations
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DATE: 2013/05/29::
41
MAGLEV - Magnetic levitation: Mechanical setup featured
MAGLEV - Magnetic levitation: Mechanical setup featured
DATE: 2008/06/30::
42
Mod-1 Lec-2 Equations of Equilibrium
Mod-1 Lec-2 Equations of Equilibrium
DATE: 2010/04/15::
43
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::
44
Reactions in Equilibrium
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DATE: 2014/03/07::
45
TEDxUIUC - Klaus Schulten - The Computational Microscope
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DATE: 2010/05/27::
46
Truss Analysis Method of Joints and Method of Sections (HD)
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DATE: 2013/01/29::
47
Mod- 9 Lec-22 Stability of Equilibrium
Mod- 9 Lec-22 Stability of Equilibrium
DATE: 2010/09/14::
48
Barrie Trower: Dangers and Lethality of Microwave Technology (2010)
Barrie Trower: Dangers and Lethality of Microwave Technology (2010)
DATE: 2011/11/19::
49
Modern Steel Products - 2014, Grain size control: lecture 5
Modern Steel Products - 2014, Grain size control: lecture 5
DATE: 2014/03/21::
50
Lec 25: Static Equilibrium, Stability, Rope Walker | 8.01 Classical Mechanics (Walter Lewin)
Lec 25: Static Equilibrium, Stability, Rope Walker | 8.01 Classical Mechanics (Walter Lewin)
DATE: 2014/12/11::
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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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