39021589
| Pregunta | Respuesta |
| Different branches of Mechanics x5 | 1. Rigid body mechanics* 2. Fluid mechanics* 3. deformable body 4. Relativistic 5. Quantum |
| what does Rigid Body Mechanics include? | Statics - the study of the system at rest or in a state of constant velocity Dynamics - the study of a system in a state of acceleration |
| Kinematics | Description of motion - can include geometry, time and space factors |
| Kinetics | the forces causing the changes of motion of systems (or lack of motion) |
| what is a system | It's a defined body or group of bodies or objects whose motion is to be examined |
| what are the three axis of movement | 1. Anterior-posterior Axis 2. Medial-lateral Axis 3. Longitudinal Axis |
| what is the relation between axis and planes | axis is perpendicular to the plane. It is that point where motion moves about (arm moving in the sagittal plane around the medial lateral axis) |
| sagittal plane | 1. cuts the body in left and right divisions 2. around the medial-lateral axis |
| frontal plane | 1. cutting the body into front and back sections 2. AKA Coronal plane 3. around the anterior-posterior axis |
| Transverse plane | 1. divides top and bottom 2. AKA horizontal 3. around the longitudinal axis |
| two main sources of information to analyze a motor skill | 1. kinematics 2. performance outcome |
| what movement does the Talocrural joint allow | dorsiflexion and plantar flexion |
| Talocrural joint | distal tibia-fibula and the talus |
| Subtalar Joint and its actions | Talus and calcaneus Action: Inversion and Eversion |
| Inertia | resistance to an action or to change *amount of inertia is determined by the objects MASS |
| Force (F=ma) | push or pull. product of mass and acceleration 1. magnitude 2. direction 3. Point of application 4. Line of Action |
| Weight (N) | gravitational force that the earth exerts on a body W = mg m = W/g |
| Mass (kg) | quantity of matter or stuff of which a body is composed |
| Pressure (N/cm^2) or (Pa) | P= Force / Area force per unit of area over which force acts |
| Volume | Amount of three-dimensional space between occupied by a body. |
| density | Mass or unit of volume density (p) = Mass/Volume |
| impulse | a product of force and the time over which the force acts |
| Newton's 1st Law - Law of Inertia | A body will maintain a state of rest or constant velocity unless acted on by an external force that changes the state |
| Newton's 2nd Law - Law of Acceleration | A force applied to a body causes an acceleration of that body of a magnitude proportional to the force, in the direction of the force and inversely proportional to the body's mass |
| Newton's 3rd Law - Law of Reaction | For every action there is an equal and opposite reaction |
| Normal/Reaction force | 1. acts perpendicular to the surface 2. always opposite to the weight of the object (may not always be straight) |
| Deformation | Change in shape |
| yield point (elastic limit) | point on the load deformation curve past which deformation is permanent (plastic region) |
| failure | loss of mechanical continuity |
| Vector | magnitude and direction |
| scalar | magnitude only |
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