HLTH3401 Lecture 5: HLTH3401-Lecture 5
Document Summary
Linear kinetics: ground reaction forces, gravity, friction. Kinetics: area of physics concerned with force and energy, the three fundamental units of physics. Fundamental measures of kinetics: force, work, energy. Inertia: acceleration, action-reaction, 4th la(cid:449) (cid:862)u(cid:374)i(cid:448)ersal gra(cid:448)itatio(cid:374)(cid:863) e(cid:454)ists, (cid:271)ut is (cid:374)ot directly applicable to biomechanics due to small masses involved. Law of inertia: a particle will remain at rest or move in a straight line with a constant velocity, if there are no forces acting on the particle. Law of acceleration: a particle acted on by an external force moves such that the force is equal to the time rate of (cid:272)ha(cid:374)ge of the li(cid:374)ear (cid:373)o(cid:373)e(cid:374)tu(cid:373); f = (cid:373) a. Law of action-reaction: when two particles exert a force upon one another, the forces act along the line joining the two particles, and the two force vectors are equal in magnitude and opposite in direction.
