Question

For the frame given below, which of the following statements regarding pin B are true? (mark all that apply) 4 ft A B 500 lb 400 lb 3 ft 3 ft 3 ft 3 ft C When you draw the FBD of the whole structure, you do not include the force in pin B because it would be an internal force Since we don't know the direction of the force in pin B, we must draw the reactions there as Bx and By and solve for them individually AB is a 2 force member, so the force in pin B can be represented as a force that goes in the direction of BA (or AB) The FBD of just bar BC will be enough to solve for the force in pin B when you account for 2 force members. BC is a 2 force member, so the force in in B can be represented as a force that goes in the direction of BC (or CB)

          For the frame given below, which of the following statements regarding pin B are true? (mark all that
apply)
4 ft
A
B
500 lb
400 lb
3 ft
3 ft 3 ft 3 ft
C
When you draw the FBD of the whole structure, you do not include the force in pin B because it would be an
internal force
Since we don't know the direction of the force in pin B, we must draw the reactions there as Bx and By and
solve for them individually
AB is a 2 force member, so the force in pin B can be represented as a force that goes in the direction of BA (or
AB)
The FBD of just bar BC will be enough to solve for the force in pin B when you account for 2 force members.
BC is a 2 force member, so the force in in B can be represented as a force that goes in the direction of BC (or
CB)

For the frame given below, which of the following statements regarding pin B are true? (mark all that
apply)
4 ft
A
B
500 lb
400 lb
3 ft
3 ft 3 ft 3 ft
C
When you draw the FBD of the whole structure, you do not include the force in pin B because it would be an
internal force
Since we don't know the direction of the force in pin B, we must draw the reactions there as Bx and By and
solve for them individually
AB is a 2 force member, so the force in pin B can be represented as a force that goes in the direction of BA (or
AB)
The FBD of just bar BC will be enough to solve for the force in pin B when you account for 2 force members.
BC is a 2 force member, so the force in in B can be represented as a force that goes in the direction of BC (or
CB)

Added by David W.

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