HEAL1000 Lecture Notes - Lecture 4: Angular Velocity, Angular Acceleration, Mechanical Advantage
Document Summary
Units: cm ,m, km: angular displacement (angle 0) Units: degrees, radians, revolutions: linear velocity (v, angular velocity (w, linear acceleration (a, angular acceleration (a) Therefore the number of revolutions may be specified. Kinetics (deals with the forces that cause motion and result from motion) Linear vs angular: linear inertia(newton"s 1st law) The resistance of a body to changes in its motion is termed inertia . In linear motion, inertia of a body is measured by its mass. The more massive a body the greater its inertia: angular inertia/moment of inertia. Dependent on: mass (larger=greater, how the mass is distributed with respect to the axis of rotation [radius of gyration (k)]- further=greater. Whole body inertia: rotate about 3 planes/axis, we can change inertia by changing body and limb position. Example: when running: flex the hip to flex knee faster which brings mass closer to axis to swing leg faster.
