D

A

C

B

Two-force members can only experience axial tension or compression

Two-force members can only achieve equilibrium in concurrent systems

Two-force members can only experience bending

Two-force members can only exist in hydraulic cylinders

Two-force members can only exist in beam systems

D

A

C

B

D

A

C

B

D

A

C

B

4

3

1

2

6

5

Fixed

Member fixed to collar

Roller

Rocker

Pin

D

A

C

B

D

A

C

B