Chapter 5 Equilibrium of a Rigid Body
Solved Example 5.3
Calculate the reactions at A and B
AY
AX
FA
BX
BY
+ MB = -FA sin 30 3 - FA cos 30 12 + 800 + 390*3*5/13= 0
FA = 105 lb
+ FX = BX + FA sin 30 - 390*5/13 = 0;
BX =
+ FY = BY + FA cos 30 390*12/13 =
GROUP PROBLEM SOLVING
Given: The 300 N force
acting on the bracket.
Find: The magnitude of the
projected component of
this force acting along
line OA
Plan:
1. Find rOA and uOA
2. Find the angle
= cos-1cfw_(F rOA)/(F
rOA)
3. Then find the projection via FO
Underwater Intervention Systems
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Lectures 1 3: Tuesday 8 September 2015 * Thursday 10 September 2015
G T Reader FALL 2015
1
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COURSE DESCRIPTION - 1
The course will
7-ELEVEN CASE S
TUDY
1
Outline
Introduction and history
Competitive strategy
Analysis
2
Introduction and history
Brief introduction
Founded
First
by Masatoshi ITO
store opened in Tokyo,1974.
During
1985-2013, the quantities of stores increas
ed rapidly
University of
Windsor
06-85-111/01 F13
ENGINEERING MECHANICS I
Wafa Polis, Ph.D, P.Eng.
CHAPTER 9
Properties of Area and Solid Elements
Center of Gravity, Center of Mass, and Centroid
Nov. 27, 2013
CENTER OF GRAVITY, CENTER OF MASS AND
CENTROID OF A BODY
EQUILIBRIUM OF A RIGID BODY
&
FREE-BODY DIAGRAMS
Todays Objectives:
Students will be able to:
a) Identify support reactions (boundary
conditions), and,
In-Class Activities:
b) Draw a free-body diagram (modeling).
Applications
Support Reactions
Free-Bod
University of
Windsor
06-85-111/01 F13
ENGINEERING MECHANICS I
Wafa Polis, Ph.D, P.Eng.
CHAPTER 6
Structural Analysis
Part A Sec. 6.1- 6.3
March 9, 2014
SIMPLE TRUSSES, THE METHOD OF JOINTS,
& ZERO-FORCE MEMBERS (Ch. 6)
Todays Objectives:
Students will be
Chapter 7 Friction
06-85-111
ENGINEERING MECHANICS I
Chapter 8
FRICTION
Engineering Mechanics: Statics, Twelfth Edition
Russell C. Hibbeler
Chapter 8 Friction
Todays Objective:
Students will be able to:
a) Understand the characteristics of dry
Engineering
University of
Windsor
06-85-111/01 F13
ENGINEERING MECHANICS I
Wafa Polis, Ph.D, P.Eng.
CHAPTER 8
Friction
Part A Sec. 8.1- 8.2
March 18, 2014
CHARACTERISTICS OF DRY FRICTION & PROBLEMS
INVOLVING DRY FRICTION (Chapter 8. 1)
Todays Objective:
Students will
Example 7.1
Chapter 7 Friction
Given: A uniform ladder weighs 30 lb.
The vertical wall is smooth (no
friction). The floor is rough
and s = 0.2.
Find:
Whether it remains in this position
when it is released.
Plan:
Pl
a) Draw a FBD.
)
b) Determine the unkno
University of
Windsor
06-85-111/01 W14
ENGINEERING MECHANICS I
Wafa Polis, Ph.D, P.Eng.
CHAPTER 8
WEDGES
Part B Sec. 8.3
March 24, 2014
WEDGES (8.3)
Todays Objectives:
Students will be able to:
a) Determine the forces on a wedge.
In-Class Activities:
Appl
University of
Windsor
06-85-111/01 W14
ENGINEERING MECHANICS I
Wafa Polis, Ph.D, P.Eng.
CHAPTER 4
Force System Resultant
(Moment of a Force)
Part A Sec. 4.1- 4.4
Feb. 3, 2014
MOMENT OF A FORCE (SCALAR FORMULATION),
& PRINCIPLE OF MOMENTS
Todays Objectives
Chapter 6 Trusses, Frames and Machines
Example 6.1
1- Finding the External Reactions:
From the truss geometry at joint A:
+ FX @ A = 0
XA = 0
+ FX (for the whole truss) =0
= 600 + 900 XB
X B = 1500 N
XB
XA
MA (for the whole truss) = 0
= -600 *4 900 *2
University of Windsor
06-85-111/01 W14
ENGINEERING MECHANICS I
CHAPTER 2
Force Vectors
Part A 2D Vectors
Lecture # 2
January 8, 2014
FORCE VECTORS, VECTOR OPERATIONS
& ADDITION COPLANAR FORCES
Todays Objective:
Students will be able to :
a) Differentiate
University of
Windsor
06-85-111/01 W14
ENGINEERING MECHANICS I
Wafa Polis, Ph.D, P.Eng.
CHAPTER 3
Equilibrium of a Particle
Part A Sec. 3.1-3.3
Jan. 27, 2014
EQUILIBRIUM OF A PARTICLE, THE FREE-BODY
DIAGRAM & COPLANAR FORCE SYSTEMS
Todays Objectives:
Stud
CARTESIAN VECTORS AND
THEIR ADDITION & SUBTRACTION
Todays Objectives:
Sections 2-5 & 2-6
Students will be able to:
a) Represent a 3-D vector in a
In-Class Activities:
Cartesian coordinate system.
Applications / Relevance
b) Find the magnitude and
coordina
University of Windsor
06-85-111/01 W14
ENGINEERING MECHANICS I
Wafa Polis, Ph.D, P.Eng.
CHAPTER 1
GENERAL PRINCIPLES
MECHANICS, UNITS, NUMERICAL CALCULATIONS &
GENERAL PROCEDURE FOR ANALYSIS
Todays Objectives:
Students will be able to:
a) Explain mechanic
5-1. Determine the force in each member of the
truss and state if the members are in tension or
compression. Set P1 = 800 kN and P2 = 400 kN.
6m
8m
C
A
8m
P2
B
P1
Method of Joints : In this case, the support reactions are not
required for determining the