KNES 300 Lecture 12: Linear Kinetics II
8 Mar 2017
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Current event: running kinematics, economy and performance. Applications of newton"s laws: 1d statics, 1d dynamics, 2d statics, 2d dynamics. Mechanics reminder: f = ma, statics: forces sum to zero, dynamics: forces sum to (mass)(acceleration) Newtonian program: framework for solving problems, separate system into components. Sample application: an athlete doing a bench press pushes the weight straight up, applying a vertical force p and no lateral forces. Example problem: 1d statics: during a rehabilitation exercise, a machine provides a horizontal force (fm = What force fp does the patient has to produce to keep the system motionless: fp: force provided by the patient, fm: force provided by the machine. Example problem: 1d dyanmics: a ball with a mass of 0. 25 kg hits the ground. = max: acceleration will not always be gravity only way to get gravity is if it. G = 20 n+ 2. 45 n = 22. 45 n (0. 25 kg)(9. 81m/ s2 ) = (0. 25 kg)(80 m/ s2 )
