KNES 300 Lecture Notes - Lecture 2: Kinesiology, Food Energy, Sagittal Plane
31 Jan 2017
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Math tools: algebra and trigonometry, differentiation and integration, vectors and scalars, vectors manipulation, dot and cross products. Physics tools: relating position, velocity and acceleration, force, work, power, energy, newton"s laws. Modeling: physical, mathematical, computer, using one system to represent another. Model can be simpler than the real system: simplify to understand function, make assumptions. Model body as system of segments: segments are rigid (cid:523)constant shape, won"t deform(cid:524, constant shape, constant inertial properties (constant mass and location of cm) Joints are pins: one degree of freedom (door hinge, 2d sagittal plane (flexion/extension) Muscles are ideal force generators: attribute joint moments to muscles (often) Ignore motion in frontal and transverse plane only use sagittal plane. Tools from mathematics: basically solving equations, examples: y=x2, y = cos(x), y = mx+b; solve for x. Trigonometry: lengths and angles of triangles, right triangle: one angle is 90 . Adj. side = r cos(cid:523) (cid:524) [not always (cid:498)x(cid:499)!]
