5Chapter 11: Rotational Dynamics and Static Equilibrium Torque = moment arm x force = rF = rsinFThe moment arm is the perpendicular distance from rotation axis to the line of action of the force.moment armline of action of the force
7 = I Torques summed about fixed axis O. Chapter 11: Rotational Dynamics and Static EquilibriumCCW +Ch11-2 Torque and Angular Acceleration = I Torques summed about fixed axis O.P11.15 (p.351)
8CT2: Two wheels with fixed hubs, each having a mass of 1 kg, start from rest, and forces are applied as shown. Assume the hubs and spokes are massless, so that the rotational inertia is I = mR2. In order to impart identical angular accelerations, how large must F2 be?A NB. 0.5 NC. 1 ND. 2 NE. 4 N
9 Chapter 11: Rotational Dynamics and Static Equilibrium CCW +Ch11-3 Zero Torque and Static EquilibriumF = 0 and = P11.22 (p.351)
10CT3: P11.22c If the mass of the teeter-totter were doubled, the answers to parts a and b for the position of the applied force woulddouble.halve.stay the same.