HLTH3401 Lecture 6: HLTH3401-Lecture 6
Document Summary
Circular movement about an axis: whole body rotations, whole mass rotations. Linear and angular motion: draw an arc moving from the wrist and from the elbow, how can you mechanically explain the different lengths, these are your radii of gyration (k) or, rotation (r) Large radius of rotation (r) = greater linear distance (s) and velocity: s = r , (cid:448) = r . Baseball hit: same and same time, = same , but r1 and r2 different, = s1 and s2 different, therefore, linear velocity and momentum different, ball struck at point 1 will undergo smaller impact to point 2. Increases the ability to apply a force over a large distance: e. g. rowing stroke, also, greater velocity at end of segment, e. g. tennis serve, but must be supported by strength ability of muscles. Angular velocity ( (cid:895: can be considered as, a series of tangential linear velocities, with changing directions.
