Presentation on theme: "Mechanical Engineering"— Presentation transcript:
1Mechanical Engineering Tutorial 4Moment of a forceHarem Gh. Hussein22- Jan-2015
2Statics’ 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.
3Problem 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.
5Problem 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.
6Solution 2Maximum MomentMinimum MomentPrepared by Harem G. H.
9Problem 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.
12Problem 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.
21Problem 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.