The compressive force developed on the smooth bolt shank A at the jaws is 20 lbs
The compressive force developed on the smooth bolt shank A at the jaws is 20 lbs. Determine the force P applied to the handles of the vise grip.
Homework Answers
The total moment of force is conserved in all types of lever(class I, class 2, and class 3).
The diagram shown in the question is a type I lever with fulcrum in between the load and the effort.
M=0
------(1)
The distance between fulcrum and load AE=2 in
Angle of the load made with the vertical 
=25o
Distance between fulcrum and effort EP=0.75+2.75=3.50 in
Force at the jaws FA=20lbs
Substituting these in equation 1,
20*2*sin 25= FE *3.50
Thus,
FE =4.83 lbs
This is the force applied at the handles of the vise grip.
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