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440:221 Intro to Engineering Mechanics: Statics
1
Fall 2011
Based on Textbook Material: Engineering Mechanics Statics, 12
th
Edition, R.C. Hibbeler, Pearson 2010.
Alberto Cuitino, Po Ting Lin
Instructors
Arturo Villegas
Assistants
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School of Engineering, Fall 2011
Equilibrium of a
RIGID BODY
2
A
440:221 Lectures
School of Engineering, Fall 2011
Topics to be covered
• What are the equations of equilibrium in 2D for a rigid body?
• What is a two and threeforce member?
• How do we solve equilibrium problems?
3
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1. The beam and the cable (with a frictionless pulley at D)
support an 80 kg load at C.
In a FBD of only the beam,
there are how many unknowns?
A)
2 forces and 1 couple moment
B)
3 forces and 1 couple moment
C)
3 forces
D)
4 forces
C)
3 forces
C)
3 forces
Conceptual Question 1
440:221 Lectures
School of Engineering, Fall 2011
2.
If the directions of the force and the couple moments
are both reversed, what will happen to the beam?
A) The beam will lift from A.
B) The beam will lift at B.
C) The beam will be restrained.
D) The beam will break.
A)
Lift from A
A)
Lift from A
Conceptual Question 2
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Draw a FBD of the crane boom, which is supported by a pin at A and
cable BC. The load of 1250 lb is suspended at B and the boom weighs
650 lb.
Let’s work on this problem
440:221 Lectures
School of Engineering, Fall 2011
Let’s work on this problem
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FBD
Solution
440:221 Lectures
School of Engineering, Fall 2011
Draw a FBD of member ABC, which is supported by a smooth
collar at A, roller at B, and link CD.
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This note was uploaded on 09/25/2011 for the course ENGINEERIN 221 taught by Professor Cuitino during the Spring '10 term at Rutgers.
 Spring '10
 CUITINO
 Statics

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