Lecture 7: BME 3150
Moments and Torque
D r . E ttie n n e  M o d e s te _ B M E 3 1 5 0 L e c tu r e N o te s
Moments and Torque
Moment and Torque are related:
Both refer to a force that causes rotation about a pivot point. Both mathematically have the
Biomechanics, 3150 Instructor, Geriel EttienneModeste [email protected] ANNOUNCMENTS FOR BME 3150 STUDENTS: ALLL UPDATES for HWs, Quizes and Exams can be found in their own folders on HUSKYCT!
EXAM 1 CHANGES PROB 4 on EXAM 1 will be WORTH 15 POINTS
BME 3150: Statics and Dynamics
Homework Set #1
Due date: Sept. 10, 2010
1. Essay Question: write 2 pages on the following topic. Use doublespaced text, 12point font, 1inch margins on each page. 15 points total.
Discuss how the human body adapts to the a
BME 3150: Statics and Dynamics
Homework Set #7
Due date: Oct. 29, 2010
Essay Question: write 23 pages on the following topic. Use doublespaced text, 12point font, 1inch margins on each page. 20 points total.
Review the historical development and curren
BME 3150: Statics and Dynamics
Homework Set #5
Due date: Oct. 15, 2010
P
1
2
5.1. Find the center of gravity of the system shown below, consisting of the
upper arm, lower arm, hand and the weight at the end of the cable. You may
assume the person weighs 1
BME 3150: Statics and Dynamics
Homework Set #6
Due date: Oct. 22, 2010
NOTE: For all of the following exercises, you should first read the
examples in the textbook, then do what they did, but with the new
numbers as given.
6.1. Consider the elbow as a 3m
BME 3150: Statics and Dynamics
Homework Set #2
Due date: Sept. 17, 2010 27 points total
1. Calculate the following:
a.) your height in meters
b.) your weight in Newtons
c.) your mass in kilograms
d.) your mass in slugs
4 points
2. Derive an expression for
BME 3150: Statics and Dynamics
Homework Set #3
Due date: Sept. 24, 2010
An intertrochanteric nail
Problem 3.6: Find the net moment Mnet that is equivalent to the two couples
shown below. You may define counter clockwise as the positive rotational
directio
Lecture 6: BME 3150
Friction
D r . E ttie n n e  M o d e s te _ B M E 3 1 5 0 L e c tu r e N o te s
What is Friction?
Frictional forces occur when two surfaces in contact slides against each other.
Examples are:  a body in motion on a rough surface or 
Lecture 5: BME 3150
Moment of Inertia, Vectors a n d M ix e d T rip le P ro d u c t
D r . E ttie n n e  M o d e s te _ B M E 3 1 5 0 L e c tu r e N o te s
Scalar Triple Product
The scalar triple product (also called mixed product) is defined as the dot
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Lecture 8: BME 3150
Statics: Equilibrium of Rigid Body
D r . E ttie n n e  M o d e s te _ B M E 3 1 5 0 L e c tu r e N o te s
Outline
Quiz #1  20mins Theory on Statics: Equilibrium  10mins Example Problems  25mins Go over problem similar to HW #2  1
fx =
CO;
b
=(b) 60) (cog
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cci
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r
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=(so+ x
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= i 5 / 9 ~ @,mD= 5 ,/00/r3sCC ~+ 5~ 1& g o o ) = 47, 700 f ? J , u o O / I f 700 C(50+3lB 9d (318fm.d ( Dr. G d \ e l E t t k n n e  MMes.te1 MS 5 &)
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Mechanical linked togetl damental ele A beam
Biomechanics, 3150, Sec 2 Instructor, Geriel EttienneModeste [email protected] Practice Exam1 Exam 1: October 13, 2009
Please Note: One 8.5 X 11 sheet of paper is allowed for the exam (only one side of notes). For Exam 1: I. Please review from Class
Biomechanics, 3150 Instructor, Shiva Kotha [email protected] Homework 1
Question 1) Use the figure below to answer the following questions. Note: Figure is not to scale
1.1)
What are the unit vectors along the X, Y, Z axis? Unit vectors along: X axis
Biomechanics, 3150 Instructor, Geriel EttienneModeste [email protected] In class Quiz 1, 9/24/2009 Please write solutions on paper
Problem 1 (worth 60 points): Given: the crosssection to the figure below:
Y
X
X 12
Y 8
Determine: The Moments of Inert
Lecture 2: BME 3150
Couples, Equivalent Systems o f F o rc e s
D r . E ttie n n e  M o d e s te _ B M E 3 1 5 0 L e c tu r e N o te s
1
Moment of a Couple
Ch 2:
D r . E ttie n n e  M o d e s te _ B M E 3 1 5 0 L e c tu r e N o te s
2
Moment of a Couple
BME 3150: Statics and Dynamics
Homework Set #4
Due date: Oct. 1, 2010
1
4.3 For the pulley shown below:
10 points
T1
T2
a.) Determine the reaction forces Rx and Ry when is 0o, 15o, 30o,
45o, 60o, 75o, and 90o.
b.) Plot your results on a single graph, usin