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EQUILIBRIUM HW-02, Problem 4: 2D Free Body Diagram (FBD) Exercises In 4a & 4b below, the body to be isolated is shown in the left-hand diagram, and an incomplete free-body diagram (FBD) of the isolated body is shown on the right. Add whatever forces are necessary in each case to form a complete free-body diagram. The weights of the bodies are negligible unless otherwise indicated. Dimensions and numerical values are omitted for simplicity. 4a. Bell crank supporting mass m with pin support at A. Body Incomplete FBD mg T m Flexible cable A A 4b. Boom OA, of negligible mass compared with mass m. Boom hinged at O and supported by hoisting cable at B. Body A B Wrong or Incomplete FBD m T mg O

          EQUILIBRIUM
HW-02, Problem 4: 2D Free Body Diagram (FBD) Exercises
In 4a & 4b below, the body to be isolated is shown in the left-hand diagram, and an incomplete
free-body diagram (FBD) of the isolated body is shown on the right. Add whatever forces are
necessary in each case to form a complete free-body diagram. The weights of the bodies are
negligible unless otherwise indicated. Dimensions and numerical values are omitted for simplicity.
4a. Bell crank supporting mass m with pin support at A.
Body
Incomplete FBD
mg
T
m
Flexible
cable A
A
4b. Boom OA, of negligible mass compared with mass m.
Boom hinged at O and supported by hoisting cable at B.
Body
A
B
Wrong or Incomplete FBD
m
T
mg
O

EQUILIBRIUM
HW-02, Problem 4: 2D Free Body Diagram (FBD) Exercises
In 4a 4b below, the body to be isolated is shown in the left-hand diagram, and an incomplete
free-body diagram (FBD) of the isolated body is shown on the right. Add whatever forces are
necessary in each case to form a complete free-body diagram. The weights of the bodies are
negligible unless otherwise indicated. Dimensions and numerical values are omitted for simplicity.
4a. Bell crank supporting mass m with pin support at A.
Body
Incomplete FBD
mg
T
m
Flexible
cable A
A
4b. Boom OA, of negligible mass compared with mass m.
Boom hinged at O and supported by hoisting cable at B.
Body
A
B
Wrong or Incomplete FBD
m
T
mg
O

Added by Andre R.

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