Kinetics: terms defined

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The familiar formulas for translational ("straight-line") motion have analogous equations for rotational motion (motion around a joint axis.)

	for TRANSLATIONAL MOTION	for ROTATIONAL MOTION
FORCE (F)	F=ma (measured in lbs or Newtons)	M=I*g (measured in ft*lbs or N*m) called MOMENT OF FORCE MOMENT TORQUE note: I=MOMENT OF INERTIA g=ANGULAR ACCELERATION
WORK (W)	W=Fd	W=Mr r=angular displacement (in radians, which are "dimensionless")
ENERGY (E)	E=Fd	E=Mr
POWER (P)	P=dE/dt P=F(ds/dt)	P=dE/dt P=M(dr/dt) P=Mw where M=joint moment w=angular velocity

Last updated 7-17-00 ©Dave Thompson PT