1. O. A disk of mass M and radius R is on the table as shown in Figure above. N is the normal
force. Fa is the gravity force, and F, is the friction force. point of contact of the disk with the
table), and Os the point shown in the Figure above. Calculate torques of all forces with respect to
points: O, (the center of the disk), O2 (the TN
Solution
for point o1
fG and N acts aqlong the lone of o1
so TN = TG = 0
Tf = =Ff*R
into the page
for point o2
Ff acts along the axis so Tf = 0
TN = R*N*sin180 = 0
TG = 0 (ANGLE 0)
for point o3
Tf = 0
TG = -Fg*o2o3
o2o3 is the distance of o3 from the bottom of disk
TN = No2o3