Torque = moment arm x force = r F = rsinF Chapter 11: Rotational Dynamics and Static Equilibrium line of action of the force moment arm The moment arm is the perpendicular distance from rotation axis to the line of action of the force.
Ch11-2 Torque and Angular Acceleration = I Torques summed about fixed axis O. P11.15 (p.351) Chapter 11: Rotational Dynamics and Static Equilibrium CCW +
CT2: 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 = mR 2. In order to impart identical angular accelerations, how large must F 2 be? A. 0.25 N B. 0.5 N C. 1 N D. 2 N E. 4 N
Ch11-3 Zero Torque and Static Equilibrium F = 0 and = 0 P11.22 (p.351) Chapter 11: Rotational Dynamics and Static Equilibrium CCW +
CT3: 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 would A. double. B. halve. C. stay the same.