Presentation on theme: "Mechanical Engineering"— Presentation transcript:
1 Mechanical Engineering Tutorial 4Moment of a forceHarem Gh. Hussein22- Jan-2015
2 Statics’ Subtopics Units system, force system, parallelogram law Forces components, resultant of coplanar forcesComponents of forces in space, moment of a force, moment of couplesEquilibrium, free body diagram, frictionCentroids and Centers of gravity, centroids of areaMoment of InertiaSecond moment of area by integration radius of gyrationPrepared by Harem G. H.
3 Problem 1The handle of the hammer is subjected to the force of F=20 lb Determine the moment of this force about the point A.Prepared by Harem G. H.
5 Problem 2Determine the angle θ (0o≤ θ ≤180o) of the force F so that it produces a maximum moment and a minimum moment about point A. Also, what are the magnitudes of these maximum and minimum moments?Prepared by Harem G. H.
6 Solution 2Maximum MomentMinimum MomentPrepared by Harem G. H.
9 Problem 3In order to raise the lamp post from the position shown, the force F on the cable must create a counterclockwise moment of 1500 lb.ft about point A. Determine the magnitude of F that must be applied to the cable.Prepared by Harem G. H.
12 Problem 4In order to hold the wheelbarrow in the position shown, force F must produce a counterclockwise moment of 200 N.m about the axle at A. Determine the required magnitude of force F.Prepared by Harem G. H.
21 Problem 8Two couples act on the frame. If d=4 , determine the resultant couple moment. Compute the result by resolving each force into x and y components and (a) finding the moment of each couple and (b) summing the moments of all the force components about point A.Prepared by Harem G. H.