PHYS 101 Chapter Notes -Net Force, Angular Velocity, Angular Acceleration
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24 Mar 2013
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First note that the system is in static equilibrium. Therefore, net torque and net force are 0. Draw the fbd and list the different forces. Torque for the weight of the beam + the torque for the person"s weight=torque of the. Using this torque formula, find the torque for each and equate them. Pay attention to the r for each one from the info in the question. Also note that the angle for the weight torques is the one between the beam closest to the pivot point (origin) and the weight force. It should indicate somethingsimilarly, the angle for the tension is the angle between the tension and the line of action extending from the radius. Hint the angle is theta+90 degree as indicated in the drawing. You are asked to find the horizontal and vertical pin forces or similarly, nx and ny. n=normal force.
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