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Mechanics (Greek Μηχανική) is the branch of science concerned with the behavior of physical bodies when subjected to forces or displacements, and the subsequent effects of the bodies on their environment. The discipline has its roots in several ancient civilizations (see History of classical mechanics and Timeline of classical mechanics). During the early modern period, scientists such as Galileo, Kepler, and especially Newton, laid the foundation for what is now known as classical mechanics. It is a branch of classical physics that deals with the particles that are moving either with less velocity or that are at rest. It can also be defined as a branch of science which deals with the motion and force of the particular object. The system of study of mechanics is shown in the table below:

Branches of mechanics

Classical versus quantum[link]

The major division of the mechanics discipline separates classical mechanics from quantum mechanics.

Historically, classical mechanics came first, while quantum mechanics is a comparatively recent invention. Classical mechanics originated with Isaac Newton's laws of motion in Principia Mathematica, while quantum mechanics didn't appear until 1900. Both are commonly held to constitute the most certain knowledge that exists about physical nature. Classical mechanics has especially often been viewed as a model for other so-called exact sciences. Essential in this respect is the relentless use of mathematics in theories, as well as the decisive role played by experiment in generating and testing them.

Quantum mechanics is of a wider scope, as it encompasses classical mechanics as a sub-discipline which applies under certain restricted circumstances. According to the correspondence principle, there is no contradiction or conflict between the two subjects, each simply pertains to specific situations. The correspondence principle states that the behavior of systems described by quantum theories reproduces classical physics in the limit of large quantum numbers. Quantum mechanics has superseded classical mechanics at the foundational level and is indispensable for the explanation and prediction of processes at molecular and (sub)atomic level. However, for macroscopic processes classical mechanics is able to solve problems which are unmanageably difficult in quantum mechanics and hence remains useful and well used. Modern descriptions of such behavior begin with a careful definition of such quantities as displacement (distance moved), time, velocity, acceleration, mass, and force. Until about 400 years ago, however, motion was explained from a very different point of view. For example, following the ideas of Greek philosopher and scientist Aristotle, scientists reasoned that a cannonball falls down because its natural position is in the earth; the sun, the moon, and the stars travel in circles around the earth because it is the nature of heavenly objects to travel in perfect circles.

The Italian physicist and astronomer Galileo brought together the ideas of other great thinkers of his time and began to analyze motion in terms of distance traveled from some starting position and the time that it took. He showed that the speed of falling objects increases steadily during the time of their fall. This acceleration is the same for heavy objects as for light ones, provided air friction (air resistance) is discounted. The English mathematician and physicist Isaac Newton improved this analysis by defining force and mass and relating these to acceleration. For objects traveling at speeds close to the speed of light, Newton’s laws were superseded by Albert Einstein’s theory of relativity. For atomic and subatomic particles, Newton’s laws were superseded by quantum theory. For everyday phenomena, however, Newton’s three laws of motion remain the cornerstone of dynamics, which is the study of what causes motion.

Relativistic versus Newtonian[link]

Analogous to the quantum versus classical reformation, Einstein's general and special theories of relativity have expanded the scope of mechanics beyond the mechanics of Newton and Galileo, and made fundamental corrections to them, that become significant and even dominant as speeds of material objects approach the speed of light, which cannot be exceeded.

For example,

In Newtonian mechanics, Newton's laws of motion,

F=ma

whereas in Relativistic mechanics and Lorentz transformations, which were first discovered by Hendrik Lorentz,

F=γma

where γ is the Lorentz factor

General relativistic versus quantum[link]

Relativistic corrections are also needed for quantum mechanics, although general relativity has not been integrated. The two theories remain incompatible, a hurdle which must be overcome in developing a theory of everything.

History[link]

This section requires expansion.

Antiquity[link]

The main theory of mechanics in antiquity was Aristotelian mechanics.^[1] A later developer in this tradition was Hipparchus.^[2]

Medieval age[link]

Arabic Machine Manuscript. Unknown date (at a guess: 16th to 19th centuries).

In the Middle Ages, Aristotle's theories were criticized and modified by a number of figures, beginning with John Philoponus in the 6th century. A central problem was that of projectile motion, which was discussed by Hipparchus and Philoponus. This led to the development of the theory of impetus by 14th century French Jean Buridan, which developed into the modern theories of inertia, velocity, acceleration and momentum. This work and others was developed in 14th century England by the Oxford Calculators such as Thomas Bradwardine, who studied and formulated various laws regarding falling bodies.

On the question of a body subject to a constant (uniform) force, the 12th century Jewish-Arab Nathanel (Iraqi, of Baghdad) stated that constant force imparts constant acceleration, while the main properties are uniformly accelerated motion (as of falling bodies) was worked out by the 14th century Oxford Calculators.

Early modern age[link]

Two central figures in the early modern age are Galileo Galilei and Isaac Newton. Galileo's final statement of his mechanics, particularly of falling bodies, is his Two New Sciences (1638). Newton's 1687 Philosophiæ Naturalis Principia Mathematica provided a detailed mathematical account of mechanics, using the newly developed mathematics of calculus and providing the basis of Newtonian mechanics.^[2]

There is some dispute over priority of various ideas: Newton's Principia is certainly the seminal work and has been tremendously influential, and the systematic mathematics therein did not and could not have been stated earlier because calculus had not been developed. However, many of the ideas, particularly as pertain to inertia (impetus) and falling bodies had been developed and stated by earlier researchers, both the then-recent Galileo and the less-known medieval predecessors. Precise credit is at times difficult or contentious because scientific language and standards of proof changed, so whether medieval statements are equivalent to modern statements or sufficient proof, or instead similar to modern statements and hypotheses is often debatable.

Modern age[link]

Two main modern developments in mechanics are general relativity of Einstein, and quantum mechanics, both developed in the 20th century based in part on earlier 19th century ideas.

Types of mechanical bodies[link]

Thus the often-used term body needs to stand for a wide assortment of objects, including particles, projectiles, spacecraft, stars, parts of machinery, parts of solids, parts of fluids (gases and liquids), etc.

Other distinctions between the various sub-disciplines of mechanics, concern the nature of the bodies being described. Particles are bodies with little (known) internal structure, treated as mathematical points in classical mechanics. Rigid bodies have size and shape, but retain a simplicity close to that of the particle, adding just a few so-called degrees of freedom, such as orientation in space.

Otherwise, bodies may be semi-rigid, i.e. elastic, or non-rigid, i.e. fluid. These subjects have both classical and quantum divisions of study.

For instance, the motion of a spacecraft, regarding its orbit and attitude (rotation), is described by the relativistic theory of classical mechanics, while the analogous movements of an atomic nucleus are described by quantum mechanics.

Sub-disciplines in mechanics[link]

The following are two lists of various subjects that are studied in mechanics.

Note that there is also the "theory of fields" which constitutes a separate discipline in physics, formally treated as distinct from mechanics, whether classical fields or quantum fields. But in actual practice, subjects belonging to mechanics and fields are closely interwoven. Thus, for instance, forces that act on particles are frequently derived from fields (electromagnetic or gravitational), and particles generate fields by acting as sources. In fact, in quantum mechanics, particles themselves are fields, as described theoretically by the wave function.

Classical mechanics[link]

Prof. Walter Lewin explains Newton's law of gravitation in MIT course 8.01^[3]

The following are described as forming Classical mechanics:

• Newtonian mechanics, the original theory of motion (kinematics) and forces (dynamics)
• Hamiltonian mechanics, a theoretical formalism, based on the principle of conservation of energy
• Lagrangian mechanics, another theoretical formalism, based on the principle of the least action
• Celestial mechanics, the motion of bodies in space: planets, comets, stars, galaxies, etc.
• Astrodynamics, spacecraft navigation, etc.
• Solid mechanics, elasticity, the properties of deformable bodies.
• Fracture mechanics
• Acoustics, sound ( = density variation propagation) in solids, fluids and gases.
• Statics, semi-rigid bodies in mechanical equilibrium
• Fluid mechanics, the motion of fluids
• Soil mechanics, mechanical behavior of soils
• Continuum mechanics, mechanics of continua (both solid and fluid)
• Hydraulics, mechanical properties of liquids
• Fluid statics, liquids in equilibrium
• Applied mechanics, or Engineering mechanics
• Biomechanics, solids, fluids, etc. in biology
• Biophysics, physical processes in living organisms
• Statistical mechanics, assemblies of particles too large to be described in a deterministic way
• Relativistic or Einsteinian mechanics, universal gravitation

Quantum mechanics[link]

The following are categorized as being part of Quantum mechanics:

• Particle physics, the motion, structure, and reactions of particles
• Nuclear physics, the motion, structure, and reactions of nuclei
• Condensed matter physics, quantum gases, solids, liquids, etc.
• Quantum statistical mechanics, large assemblies of particles

Professional organizations[link]

• Applied Mechanics Division, American Society of Mechanical Engineers
• Fluid Dynamics Division, American Physical Society
• Institution of Mechanical Engineers is the United Kingdom's qualifying body for Mechanical Engineers and has been the home of Mechanical Engineers for over 150 years.
• International Union of Theoretical and Applied Mechanics

See also[link]

• Analytical mechanics
• Applied mechanics
• Dynamics
• Engineering
• Index of engineering science and mechanics articles
• Kinematics
• Kinetics
• Non-autonomous mechanics
• Statics
• Wiesen Test of Mechanical Aptitude (WTMA)

References[link]

Further reading[link]

• Landau, L. D.; Lifshitz, E. M. (1972). Mechanics and Electrodynamics, Vol. 1. Franklin Book Company, Inc. ISBN 0-08-016739-X. 

External links[link]

Look up mechanics in Wiktionary, the free dictionary.

• iMechanica: the web of mechanics and mechanicians
• Mechanics Blog by a Purdue University Professor
• The Mechanics program at Virginia Tech
• Physclips: Mechanics with animations and video clips from the University of New South Wales
• U.S. National Committee on Theoretical and Applied Mechanics
• Interactive learning resources for teaching Mechanics
• The Archimedes Project

Ken Block
Ken Block in 2008.
Nationality	American
Born	(1967-11-21) 21 November 1967 (age 44) Long Beach, California
2012 Rally America
Debut season	2005
Current team	Monster World Rally Team
Best finish	2nd Overall in Rally America in 2006 and 2008
Awards
2004[1] 2005[1] 2009	• One of the most influential people (#17) in Sports Business Journal • Ad Age's Marketing 50 • One of the Fast 50 in Fast Company Magazine • 40 Under 40 Awards, Sports Business Journal • Rally America's Rookie of the Year • Gymkhana 2 was 2009's #4 most viewed viral video

Ken Block (born November 21, 1967, in Long Beach, California)^[2] is a professional rally driver with the Monster World Rally Team. Block is also one of the co-founders and recently appointed Chief Brand Officer of DC Shoes.^[1] Block has also competed in many action sports events including skateboarding, snowboarding, and motocross.

Rallying[link]

2005[link]

In 2005, Ken Block began his national rallying career with the Vermont SportsCar team.^[3] Vermont SportsCar prepared a 2005 Subaru WRX STi for Block to compete. His first event of the rallying season was Sno*Drift, where he ended up finishing seventh overall and fifth in the Group N class.^[4] During the 2005 season, Block had five top five finishes and placed third overall in the Group N class and fourth overall in the Rally America National Championship.^[3] At the end of his first rallying year, Ken Block had won the Rally America Rookie of the Year award.^[5]

2006[link]

In 2006, Ken Block along with his DC rally teammate Travis Pastrana signed a new sponsorship deal with Subaru.^[3] Through this deal with Subaru, the teammates became known as "Subaru Rally Team USA."^[3] With the new rally season, Block also got a brand new Vermont SportsCar prepped 2006 Subaru WRX STi.^[3] He competed in the first ever X Games rally event at X Games XII.^[3] In the competition, Block ended up finishing third to take the bronze.^[3] He went on to compete in the 2006 Rally America National Championship, where he finished second overall.^[3]

2007[link]

In 2007, Ken Block competed in the X Games XIII rally event, where he placed second overall and won a silver medal.^[5] In the 2007 Rally America National Championship, Block finished third overall.^[5] During this season, Block also entered in a few rounds of the World Rally Championship; Rally Mexico and Rally New Zealand.^[4] In Rally New Zealand, Block recorded two top-five stage times in the Group N class.^[4] At the end of 2007, Block had achieved 19 podiums and 8 overall victories in rally events.^[1]

2008[link]

In 2008, Block was provided with a brand new rally prepped 2008 Subaru WRX STi to compete. Block decided to compete in the Rallye Baie-des Chaleurs of the Canadian Rally Championship to gain some experience with his new 2008 rally car and prepare for the World Rally Championships later this year.^[6] Block gained his first Canadian rally win at the event.^[6] This was only the second event for the new car.^[6] Block and his co-driver were unable to get any championship points at the event due to not having a Canadian competition license.^[6] Block competed in the Rally New York USA competition and finished in first place.^[7] In the X Games XIV rally competition, Block finished tied for third place with Dave Mirra.^[8] This occurrence was due to both competitors having issues with their car. Block, who made it to the semi-finals of the event, had a radiator problem after landing the car awkwardly on a jump. With both bronze place competitors in damaged cars unable to compete, the medals were awarded to both of them.^[8]

Block competed in the 2008 Rally America National championship, which concluded on October 17, 2008. In the event, he finished second overall with a strong victory in the last event. In the Lake Superior Performance Rally stage, Block finished over one minute ahead of his next closest competitor and secured the second overall position.^[9] Next up for Block this rally season is three World Rally Championship events.^[4]

2009[link]

Block appeared in a segment of motoring show Top Gear.^[10]

2010[link]

Ken Block testing Ford Fiesta for the 2010 Rally America season

Block driving a Ford Focus RS WRC at the 2010 Rallye de France

On January 6, 2010 the Monster World Rally Team announced Ken as their driver for selected rounds of the World Rally Championship, in which he will be campaigning the Monster/Ford Racing Focus RS WRC 08. His car will be prepared and run by the North of England based M-Sport, who also prepare the official Ford WRC cars. He will be simultaneously running in his sixth season of the Rally America Championship in an open class Ford Fiesta, as well as his fifth X-games. Ken will also be the first ever American driver to campaign for the World Rally Championship. On February 27, Block won the Rally in the 100 Acre Wood (Rally America) for the 5th consecutive time. This broke the record held by John Buffum.^[11] Ken is currently being trained by former Ford factory driver Markko Märtin. At the Spain rally, he won his first 2 points in World Rally Championship.

2011[link]

On March 23, Block and his co-driver Alex Gelsomino were taken to hospital, having rolled their Ford Fiesta RS WRC during the shakedown stage of the 2011 Rally de Portugal in Faro, Portugal.^[12] A representative of the Monster World Rally team later stated that both men were fine.^[13]

Complete Rally America results[link]

(key)

Complete WRC results[link]

* Season in progress.

PWRC results[link]

Other motorsport activities[link]

On October 15, 2009, it was reported that Block was close to a deal to join the World Rally Championship in a new Ford team. Long time co-driver Alex Gelsomino is also reportedly involved in the deal. Former Subaru WRC driver Chris Atkinson has been reported to be lined up as Block's team-mate in the all-new Monster Energy Drink Ford World Rally Team.^[14]

In 2005, Ken Block along with his DC Shoes associates participated in the Gumball 3000 Rally. For the event they sent out three modified 2004 Subaru WRX STi's sponsored by DC Shoes.^[15][16]

In 2006, Ken Block competed in the One Lap of America competition along with Brian Scotto. They were teamed up in a 2006 Subaru WRX STi and finished forty-fifth overall.^[17]

In 2006, for the Discovery Channel show Stunt Junkies, Ken Block jumped his Subaru WRX STi rally car 171 feet (52 m) and a max height of 25 feet (7.6 m).^[3] The whole episode was dedicated to Ken Block attempting this stunt.

In 2007, Ken Block joined the DC Shoes Snowboarding team at New Zealand's Snow Park.^[3] Block did massive jumps and assisted in snowboarding tricks while driving his rally car on the mountain alongside the snowboarders. The session made the cover of the December 2007 issue of Snowboarder Magazine and closed out the MTN.LAB 1.5 DVD.^[3]

In 2009, for the BBC show Top Gear, Ken took James May out for Gymkhana-style driving at Block's stunt course at Inyokern Airport, an operational California airport, also starring Ricky Carmichael, whom Ken describes as 'a good friend'.

In 2010, for the BBC show Top Gear, Ken took the feature car from the previous episode (a Reliant Robin) for a lap of the Top Gear test track. He rolled the car and was unable to complete a lap but was unhurt.

On January 6, 2010, the announcement is made as Ken joins up with Ford and begins his WRC career driving both a Ford Fiesta and Focus RS WRC.

On August 24, 2010, Block released the first of a three part Gymkhana 3 video release featuring his new Ford Fiesta.^[18]

Ken Block also holds the world record for the world's fastest snow cat, a modified Subaru STI called a Trax STI.^{[citation needed]}

On September 14, 2010, Block's third Gymkhana video, featuring a Ford Fiesta, was released on YouTube.^[19] The video got more than seven million views in its first week.

On August 16, 2011, the fourth Gymkhana video, The Hollywood Megamercial was released on YouTube, featuring Block driving around the Universal Studios backlot.^[20]

Involvement In Colin McRae: Dirt 2 and Dirt 3[link]

Ken Block is featured as a driver in Codemasters Colin McRae: Dirt 2, along with his Subaru Rally Team USA Impreza.
In Dirt 3 he is seen as a driver and Gymkhana teacher, his Monster World Rally Team vehicles are available in the game.

References[link]

External links[link]

Wikimedia Commons has media related to: Ken Block

• Ken Block's Official site
• Monster World Rally Team
• Rally Results and News
• Subaru Rally Team USA
• Rally America Website
• Ken Block Official Merchandise Store
• Ken Block Interview
• Gymkhana racing improved by Ken Block, Video, ~4min
• dirt2game.com