ME 204
Chapter 12.9
Mechanical Advantage
Cable and Pulley Systems
Dependent Motion Analysis
Calculus Review
In Class Problem
Given: A jet plane travels along a vertical
parabolic path defined by the equation
y = 0.4x2. At point A, the jet has a
speed of 2

ME 204
Relative Motion
ME 204
Relative Motion
RELATIVE-MOTION ANALYSIS EXAMPLE
School Bus Example
Is this the boys actual
or relative velocity?
B
Boy running
5 mi/hr
How fast is the boy moving?
A
Bus traveling
55 mi/hr
60 mi/hr
Write an equation for what

In Class Problem
Two boats leave the shore at the same time and travel in the directions shown. If
vA=30 ft/s and vB=20 ft/s, determine the speed of boat B with respect to boat A. How
long after leaving the shore will the boats be 800 ft apart
What is thi

ME 204
Chapter 12.6
Projectile Motion
In Class Problem
when t = 0.5 s.
X-dir
Y-dir
x 4t 4
y 2 4 x Path
y 2 4 4t 4
2
y 16t 4 4t
v x dx
dt
v y dy
dt
16t 3
8t
@ 0.5 s
@ 0.5 s
v x 2 ms
v y 4 ms
v 2 2 4 2 4.47 ms
Two balls are fired at the same
instant. The r

ME 204
Day 2
Rectilinear Motion (straight line motion)
Chapter 12.2
Remember the quizzes that are
due each Saturday
I have posted a summary of important
concepts on I-learn that you should
UNDERSTAND.
The sheet also contains important facts
that you sho

ME 204
Syllabus & Course Introduction
Chapter 12.1
Worked in the Private Industry for
almost 14 years
Sacramento, California office
After 14 Years of Working in The
Industry
Joined BYU-Idaho Mechanical Engineering
Department in Fall 2015
Objectives
By the

ME 204
Curved Path and Projectile Motion
Review
What do we have in our Dynamics Toolbox?
Special Case of Constant Acceleration:
Introduction
But how do we deal with this?
Weve seen this type of motion
But how do we deal with this?
Weve seen this type of

In Class Problem
The automobile is originally at rest when s=0. If it then starts to increase its speed at
, where t is in seconds, determine
v 0.15t s 2
the magnitudes of its velocity and acceleration
at s=300 ft.
ft
Where is the car located (has it gone

ME 204
Chapter 12.7
Curved Motion:
Normal and Tangential Coordinates
Remember the story of David and Goliath?
How does this type of sling work?
The mass would
continue in a
The mass on the end
straight line?
of a rope is being
swung around the
center poin