Consider what is the maximum force an adult person can apply

Consider what is the maximum force an adult person can apply to the handle of the oar by his both hands? Assume oar dimensions and having the force on the handle determine support reaction on the shackle and the resultant water resistance force at the lower end as well as the distributed force from water resistance. Sketch bending moments and shear forces diagrams. Identify the critical section and the value of the bending moment at that section.

Solution

critical section in the figre is the neck or shackle because is the part most fragile to rupture