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6) A beam AB of weight Wis lifted over a ledge as shown as shown in the figure. A rope connects the beam a B to a block at C. The weight of the block is Q. Complete the free body diagrams on your answer sheet, neglecting all friction. Do_not attempt to enforce equilibrium. Label each force you add and specify the direction of any force that is not horizontal or vertical to the page. (4 points - partial credit is possible) 7) Now consider there to be a friction force between the beam and the corner of the ledge and between the block and the ground. Add these forces to your free body diagrams. Choose the directions carefully! Do not make any assumptions on whether the system is static, kinetic or motion is impending. (4 points - partial credit is possible) A For Problems 6-8 8) Based on your free body diagrams and given s as the coefficient of static friction at all contact points, write the equation(s) that apply when the system is in the state of impending motion. (4 points partial credit is possible)

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engineering   Mechanical-Engineering   
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Answer #1

s) FBD (without friction) T- Tension in rope for block c for beam AB Nc NormaJ force AW NAB- NoTmal force ) FBD (with friction) P FeニFrictional force for block c FABI NAB FAB- frictional fome for beam AB Nc FAB 11 AB Also AB.sine + T P Equations i)& ci) are equations of mobin. Frictional forces act in the opposite directi on of motion

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