Question

U-3 Nm
F = 2N
7. As
3. A wheel of diameter 2 m is
shown in Fig. 1.28 with axle
at 0. A force F = 2 N is
applied at B in the direction
shown in figure. Calculate
the moment of force about
(i) the centre 0, and (ii) the
point A


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Answer 1

Explanation:

Force F=2 N

(1) : 

Perpendicular distance between point O and B,   r=2diameter=22=1 m

Moment of force about centre O,   τO=rF=1×2=2 N m

(2) : 

Perpendicular distance between point A and B,   r=diameter=2 m

Moment of force about centre A,   τA=rF=2×2=4 N m