1. Y.A. Khulief 1 MECHANICS OF MACHINES ME-309 S tatic F orce A nalysis

2. Y.A. Khulief 2 MECHANICS OF MACHINES Example: The mechanism shown is drawn to scale 1cm : 0.2m Use graphical method to determine the torque needed for static equilibrium Carry out all your graphical solutions on the scaled drawing of the given mechanism We can consider the FBD of Links-3 4 2 3

3. Y.A. Khulief 3 MECHANICS OF MACHINES Example: Example: Use graphical method to determine the torque for static equilibrium C.P. h Add P 1 & P 2 Force Polygon

4. Y.A. Khulief 4 MECHANICS OF MACHINES Consider a force scale as 1cm : 200N, then construct a parallelogram with this scale, and then measure R. 4 cm 2.5 cm R=4.4 cm R=4.4cm x 200N=880 N Back

5. Y.A. Khulief 5 MECHANICS OF MACHINES C.P. Consider a force scale as 1cm : 300N, then construct the force polygon for the three forces acting on link-3 and having the concurrency point (C.P.), then measure. 2.4 cm F 43 =2.4 cm x 300N=720 N Back 2.93 cm

6. Y.A. Khulief 6 MECHANICS OF MACHINES