Practicing Supports and 2FM’s

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Presentation transcript:

Practicing Supports and 2FM’s Lesson 20 Practicing Supports and 2FM’s

How Many Unknowns? ?

How Many Unknowns? Ax ? Pin Ay

How Many Unknowns? Ax Roller Ay By

How Many Unknowns? ?

How Many Unknowns? Ax Ay

How Many Unknowns? Ax MA Fixed Ay

How Many Unknowns? ?

How Many Unknowns? Normal! Dy

How Many Unknowns? ? Normal! Dy

How Many Unknowns? Ax Ay Normal! Dy

How Many Unknowns? Or (if you want…) Ay’ Ax’ Dy

How Many Unknowns? ?

How Many Unknowns?

How Many Unknowns?

How Many Unknowns? “Smooth contact”

How Many Unknowns? “Smooth contact”

How Many Unknowns? “Smooth contact” = Normal !

How Many Unknowns? “Smooth contact” = Normal !

How Many Unknowns? x y “Smooth contact” = Normal !

How Many Unknowns?

How Many Unknowns?

How Many Unknowns? Smooth collar B is fixed to the rod AB, but is allowed to slide along CD.

How Many Unknowns? Smooth collar B is fixed to the rod AB, but is allowed to slide along CD.

How Many Unknowns? Smooth collar B is fixed to the rod AB, but is allowed to slide along CD.

Find the 2-Force Member (2FM)

Find the 2-Force Member (2FM) CD is 2FM

Find the 2-Force Member (2FM) ABD is NOT 2FM

Find the 2-Force Member (2FM) ABD is NOT 2FM

Important Contrast: Pin-Ended Member is not the same as Hole in a Solid Member Solid Member with a hole in it.

Important Contrast: Pin-Ended Member is not the same as Hole in a Solid Member 2FM Solid Member with a hole in it.