Test 2 Engineering Mechanics-Statics...

CE 2010 Handout #14 Section 5.4 (Exam #2)

Learning Objectives

 Explain what a two-force member is and identify one.

 Determine the reaction provided by a two-force member.

Two-Force Members:

 can be any ____________.

 have exactly ___________ (resultant) forces.

 are usually part of a larger structure consisting of two or more members. Structure examples

include: _____________, _______________, and __________________.

 have forces transferred to them by ____________. Pins may be ____________ (connecting it to

another member) or _______________ (connecting it to a reaction).

 can be properly identified as being two-force members if they satisfy these two criteria:

1. The member has exactly ______ pins.

2. The member has no _______________ _____________ acting on it (except loads applied at

the pin).

 satisfy equations of __________________ : ______________ and _____________

 do not translate. Therefore, they carry two forces that are along the same ____________ ______

__________. These forces must be ____________ in magnitude, opposite in

____________________.

 do not rotate. Therefore, the resultant forces must be _________________ to the

_______________ _________________ connecting the two pins.

Which scenario has the free body diagram of a two-force member?

CE 2010 Handout #14 Section 5.4 (Exam #2)

Identify the Two-Force Members in These Structures:

Ex #1 The lever ABC is pin supported at A and connected to a short

link BD as shown. If the weight of the members is negligible,

determine the force of the pin on the lever at A.