what is body mechanics?
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Kinesiology, or study of the physics of the human body, with widespread applications in medicine, sports, dance, animation, martial arts, etc.
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Kinesiology II\n Physics of Motion\nI.  Force \nA.  Definition\n1.  Force = mass * acceleration\n2.  Mass is a fundamental dimension, units g, kg\n3.  Acceleration is change in velocity, units m/sec/sec or m/s2\n4.  “Weight” is a force, units pounds or Newtons\n- Pounds = mass * acceleration of gravity\n- Why your weight, but not your mass, is different on the moon\n- Gravity on Earth = 9.8 m/sec2 \n5.  Example:  A person with a mass of 70 kg weighs:\n                        70*9.8 = 686 kg*m/sec2 or 686 N\n \nB.  Aspects\n1.  Force has a point of application or origin\nExample:  location where muscle attaches to bone\n2.  Force has a line of application\nFollows the tendon\n3.  A rotational force is called torque\n4.  Force has direction\nCan be indicated in two (x,y) or three (x,y,z) dimensional space\n5.  Force has magnitude\nMagnitude is measured in Newtons\n \nII.  Rotational Force \n1.  Force (mass*acceleration) may cause rotation about an axis\n2.  Moment of force (=Torque) is equal to the force times the lever arm – the perpendicular, straight line distance between the axis of rotation and the force\n3.  Moment of force (torque) = force* perpendicular distance \nUnits:  N*m\n4.  Sign convention:  \nClockwise moment = negative\nCounterclockwise moment = positive\n \nIII.  Levers – Location of effort force, load or resistance force, and rotational axis\nA.  Three types of levers\n1.  First class\n2.  Second class\n3.  Third class\n4.  Differences between the three have to do with the relative locations of the effort, load, and the axis of rotation\n \nB.  First Class Lever\n1.  “EOR”\nO = axis or pivot point\nE = effort force (as applied by muscle/tendon)\nR = resistance (load) force (outside force such as barbell)\n2.  The effort force and the load force are located on opposite sides of the axis of rotation\n3.  Example:  seesaw\n4.  Anatomical example:  Triceps muscle – elbow extensor\nInsertion:  Olecranon process of ulna\n5.  First class levers are rare in human body\n \nC.  Second Class Lever\n1.  “ORE”\n2.  The resistance (load) force and the effort force are on the same side of the axis of rotation\n3.  The effort lever arm is GREATER than the resistance lever arm\n4.  Example:  wheel barrow\n5.  Anatomical example:  brachioradialis – elbow flexor\nInsertion:  Styloid process of radius (distal – past the center of mass)\n6.  Second class levers are rare in the human body\n \nD.  Third Class Lever\n1.  “OER”\n2.  Effort and resistance (load) forces are on the same side of the axis of rotation\n3.  The effort lever arm is SMALLER than the resistance lever arm\n4.  Anatomical example:  Biceps brachii – elbow flexor\nInsertion:  Tuberosity of radius (proximal)\n5.  Anatomical example 2:  Quadriceps group – knee extensors\nInsertion:  Patella, tibia \n6.  Third class levers are common in the human body\n \nIV.  Mechanical Advantage\n     A.  Mechanical Advantage defined as:\nEffort Lever Arm/Resistance Lever Arm\n1.  A second class lever will always have a mechanical advantage greater than one because the effort lever arm is always GREATER than the resistance lever arm\n2.  A third class lever will always have a mechanical advantage less than one because the effort lever arm is always LESS than the resistance lever arm\n3.  A first class lever can have a mechanical advantage less than, equal to, OR greater than one, depending on the locations of the effort force and resistance force versus the axis of rotation\n \nB.  Mechanical Advantage VS. Speed\n1.  The mechanical advantage of a third class lever – common in the body – is poor – always less than one\n2.  However, the SPEED of rotation created by a third class lever is high\n \n\n3.  Because the origin of the resistance force is located farther from the axis than the origin of the effort force, it must travel a greater distance in the same time\n4.  Greater distance per unit time = greater speed\n5.  Good for throwing objects, kic
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You basically just asked this!!\n\nMass is the amount of matter in your body, weight is how much gravity is pulling on you.
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Newton's laws of motion.\nConservation of engery.\nConservation of momentum.
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Centre of mass- is the point in or outside a rigid body along which(not necessarily at which) when a force is applied on the body, than the body behaves like a point mass, i.e. the body moves along the direction of applied force, without any rotational motion.\nConsider a system of particles of  a rigid body and choose a point of reference in the space. Let m1, m2, m3,…….be the mass of the particles and r1, r2, r3…………be their position vectors respectively, \nThen the position vector of the centre of mass will be \nR= (m1r1+m2r2+………..mnrn )/ (m1+m2+…..+mn)\nCentre of gravity- is the point at which the vector sum of the gravitational forces acting on all the particles of the rigid body acts, irrespective of the orientation of the rigid body. It can be found out by balancing the body on a pointer and equating the total clockwise moment and total anticlockwise moment acting on it.
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Inertia is the tendency of a body to maintain its state of rest or uniform motion, unless acted upon by an external force.\nIt is a bane in that too much of it, can make the body sluggish and unwilling to return into its action mode !\nIt is a boon in that the body gets adequate rest, which also readies it for the next spell of action.
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statics & dynamics, \nstrength of materials, \nsolid mechanics, \ninstrumentation and measurement, \nthermodynamics, heat transfer, energy conversion, and refrigeration / air conditioning, \nfluid mechanics and dynamics, \nmechanism design (including kinematics and dynamics), \nmanufacturing technology or processes, \nengineering design, \nmechatronics and/or control theory, \ndrafting or CAD/CAM
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http://www.innerbody.com/htm/body.html
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The study of mechanics concerns the motion of physical bodies and the forces that act upon them. Most people are familiar with systems described by Newtonian mechanics - objects that sit around, move, collide, and are influenced by gravity. Mechanical energy includes things like the kinetic energy of a moving billiard ball, or the potential energy a roller coaster at the top of its track.\n\nThe physics of electromagnetism were not understood at the time of Newton, but in some situations, the mechanics (i.e. the mathematics of motion) of bodies influenced by electromagnetic forces is the same as that of those influenced by gravity. For example, two particles of opposite electrical charge experience an attractive force which is (allowing for certain idealizations) mathematically identical to the gravitational forces two passing planets experience. An electromechanical system might also involve the conversion of mechanical energy into electrical charges or magnetic fields, or vice versa.\n\nEveryday objects are composed of atoms and molecules, which to some degree, are like billiard balls that are constantly bouncing off one another. "Mechanical energy" might include the kinetic energy of these particles, or potential energy stored in the physical arrangement. For example, a compressed solid exerts pressure because electromagnetic forces between particles tend to push them apart. Compressing a solid (moving the particles "uphill" against repulsive electromagnetic forces) stores potential energy in a similar way that pushing a boulder up a hill does (moving the object uphill against the attractive gravitational force of the Earth). On the other hand, a compressed gas exerts pressure because independently moving particles collide with the walls of the container and change direction. The particle is accelerated (its velocity vector changed), and the acceleration times the mass of the particle gives the force applied. Compressing a gas changes the average kinetic energy of the particles, which is reflected in the corresponding increase in the temperature of the gas. The pressure also increases, but this is because the same number of particles have been forced into a smaller volume, so they collide more often with the walls. The force of any given collision is the same, but the number of collisions has increased.\n\nPotential energy does play a role in the pressure of a gas. During an individual collision, a gas molecule comes closer to the molecules of the container wall. The electric fields exert a force on the molecule, slowing it down and reducing its kinetic energy. This energy is temporarily stored as potential energy. Soon, the particle is nearly stationary (if it happened to approach head on), or at least, it is not approaching the wall any more. The electric fields continue to exert a force on the gas molecule. The force continues to change the velocity, and soon the molecule is moving away from the wall and gaining kinetic energy. Generally, the collision is elastic, and all of the kinetic energy is recovered and the particle continues moving with the same speed it had originally.\n\nSolid mechanics studies how rigid bodies behave in response to external forces. Fluid mechanics studies the internal motion of liquids, gases, and other forms of matter. Mechanical energy can be expended in crushing a soda can, affecting the motion and positional arrangement of its component reioufdgkljh kjhfbkjh ael;hgfljh wajh kjfrom the molecules of a solid to the molecules of a liquid when, for example, a glass of water is stirred.\n\nYou could get more information from the link below...
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http://www.abastaff.com/presentations/ergonomics/\nhttp://www.championseating.com/cgi-bin/champion.cgi/ergo_stretch.html
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Your bodies muscles tighten and constrict to generate heat and energy
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Of course yes. Inertia is described by the first Newton's law of motion, which applies to any mass, be it a rigid body or not. You can imagine this experiment: put on the bus floor a glass sphere (a good approximation of a perfectly rigid body) and imagine what happens when the bus deviates from resting or moving uniformly: the sphere moves w.r.t. the floor. Its motion is not related to its rigidity, but to the fact that the sphere is not connected to the bus structure, therefore it doesn't receive any external force contrasting its inertia.
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<equilibrium, state of balance. When a body or a system is in equilibrium, there is no net tendency to change. In mechanics, equilibrium has to do with the forces acting on a body. When no force is acting to make a body move in a line, the body is in translational equilibrium; when no force is acting to make the body turn, the body is in rotational equilibrium. A body in equilibrium at rest is said to be in static equilibrium. However, a state of equilibrium does not mean that no forces act on the body, but only that the forces are balanced. For example, when a lever is being used to hold up a raised object, forces are being exerted downward on each end of the lever and upward on its fulcrum, but the upward and downward forces balance to maintain translational equilibrium, and the clockwise and counterclockwise moments of the forces on either end balance to maintain rotational equilibrium. The stability of a body is a measure of its ability to return to a position of equilibrium after being disturbed. It depends on the shape of the body and the location of its center of gravity (see center of mass). A body with a large flat base and a low center of gravity will be very stable, returning quickly to its position of equilibrium after being tipped. However, a body with a small base and high center of gravity will tend to topple if tipped and is thus less stable than the first body. A body balanced precariously on a point is in unstable equilibrium. Some bodies, such as a ball or a cone lying on its side, do not return to their original position of equilibrium when pushed, assuming instead a new position of equilibrium; these are said to be in neutral 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.
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Hardening of body tissue.
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Physical therapy (also known as physiotherapy) is a health profession concerned with the assessment, diagnosis, and treatment of disease and disability through physical means. It is based upon principles of medical science, and is generally held to be within the sphere of conventional (rather than alternative) medicine. Physiotherapy is practiced by physiotherapists (also known as physical therapists, e.g. in the United States), though aspects may also be practiced under supervised delegation by physiotherapy assistants or other health professionals.
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Newton's Law of motion\n----------------------\n\n"FOR EVERY ACTION THERE IS AN EQUAL AND OPPOSITE REACTION"\n\nThis law is applicable in each and every day action like walking, firing bullets to lanching rockets.\n\nThe force we given to the floor while walking resulted in a opposite force from the floor which moves us forward.
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Newton's Laws of motion.Everything continues in its state of rest or motion unless acted upon by an external unbalanced force.