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Technology.

Forces and structures
Across
The method used to make a frame structure rigid.
This is the force that tends to cut a member, for example sciccors.
Concrete or wooden beams that support the walls above windows or doors.
The force that tends to twist a member.
A member that is in compression.
Down
A force that presses a member by squashing it.
The member that is added diagonally to a frame structure to make it rigid.
A member that is added to a structure for support that can withstand tension.
A member that is in tension.
A force that pulls on a member by stretching it.