Fall 2009
PHYS 201
Examination 3 (Chapters 912)
ID:
Tlease answer each problem. Partial credit will be given for showing all work. The
acceleration of gravity (g) is 9.8 m/s2. Vectors are indicated as bold print. A table of
centerofmass inertia values
Chapter 1:
MEASUREMENT
1. The SI standard of time is based on:
A. the daily rotation of the earth
B. the frequency of light emitted by Kr86
C. the yearly revolution of the earth about the sun
D. a precision pendulum clock
E. none of these
Ans: E
2. A nano
4/7/2014
Gravitation Near Earths Surface
Assume that Earth is a uniform sphere of mass ME =
5.98x1024 kg.
The acceleration ag due to gravity
= 2
Note: In the above equation, r is the distance from the
Earths center.
On Earths surface (r = radius of
4/8/2014
Gravitational Potential Energy
The gravitational force is a conservative force.
The work done on an object by the gravitational force does
not depend on the path taken by that object.
We can associate a potential energy U with the
gravitationa
4/15/2014
Which of the following relationships between the force F on a
particle and the particles position x gives SHM
a. = 5
b. = 400 2
c. = 10
d. Both a and b
e. Both a and c.
In the figure, the block has a kinetic energy of 3 J and the
spring has an e
4/29/2014
Intensity
Sound waves transport energy
1. Kinetic energy
2. Potential energy associated with compressions and
expansions.
The intensity I of a sound wave at a surface is the
average rate per unit area at which energy is
transferred by the wave
3/9/2014
Work Done by External Force
Work is transferred to or from a system by
means of an external force acting on that system
(page 192).
If an external force does work W on a system, the
mechanical energy of that system is NOT
constant:
= = +
Work
3/16/2014
Conservation of Momentum
Newtons second law
If no net external force acts on a system of particles, the
total linear momentum of the system cannot change
(page 230).
=
=
If the component of the net external force on a closed
system is zero
1
Chapter 9
Center of Mass and Linear Momentum
Center of Mass

The Center of Mass of a system of particles is the point that moves as though
1.) All of the systems mass were concentrated there
2.) All External Forces were applied there

Two particle sys
Chapter1
page 1
Chapter 1
Measurement
Quantities
 Two categories
1. Base or Fundamental
Assign standards to base quantities alone
Cannot be expressed in terms of other base quantities
Example: Length, Time, and Mass
2. Nonfundamental
Define in terms
Chapter 12
page 1
Chapter 12
Equilibrium
Static Equilibrium

An object is in Static Equilibrium if both its Translational and Rotation Velocity are
zero
Three criteria must be met
F
1. net =0
2. net =0
P
3. =0
 Consider a specific case
All Forces act w
Chapter 13
page 1
Chapter 13
Gravitation
Newtons Law of Gravitation

Two point masses, m1 and m2 , separated by a Distance r
Both masses attract each other with a Force
F=G

m1 m2
r2
Gravitation: Tendency of bodies to move toward one another
 Gravitati
4/14/2014
Oscillations
Dr. DiFabio
Physics 201 Lecture
UL Spring 2014
Halliday, Resnick, and Walker (Chapter 15)
Simple Harmonic Motion
Harmonic Motion: Any motion that repeats at
regular intervals (page 414).
Simple Harmonic Motion (SHM): Motion that i
3/4/2014
Conservation of Mechanical Energy
Mechanical Energy Emec
= +
Principle of Conservation of Mechanical Energy
In an isolated system where only conservative forces
cause energy changes, the kinetic energy and potential
energy can change, but the
4/6/2014
Gravitation
Dr. DiFabio
Physics 201 Lecture
UL Spring 2014
Halliday, Resnick, and Walker (Chapter 13)
Newtons Law of Gravitation
Two point masses, m1 and m2, separated by a
distance r.
Both masses attract each other with a force
1 2
=
2
Gravi
Physics 201, Exam #1
February 6, 2014
Section: 2
Version: 2
Name: _
Multiple Choice Score
Workout Problem Score
Workout Problem
1
2
3
4
5
6
Total
Overall Score
Points Earned
Total Possible
5
5
18
15
15
10
68
Multiple Choice: 4 points each
1. What is the S
Physics 201, Exam #1
February 6, 2014
Section: 2
Version: 1
Name: _
Multiple Choice Score
Workout Problem Score
Workout Problem
1
2
3
4
5
6
Total
Overall Score
Points Earned
Total Possible
5
5
18
15
15
10
68
Multiple Choice: 4 points each
1. What is the S
4/28/2014
Waves  I
Dr. DiFabio
Physics 201 Lecture
UL Spring 2014
Halliday, Resnick, and Walker (Chapter 16 and 17)
Types of Waves
1. Mechanical waves
They are governed by Newtons laws, and they can exist
only within a material medium (page 445).
Examp
3/18/2014
Rotation
Dr. DiFabio
Physics 201 Lecture
UL Spring 2014
Halliday, Resnick, and Walker (Chapter 10)
Two Types of Motion
Translation: an object moves along a straight or
curved line (page 258).
Rotation: an object turns about an axis (page
258).
1
Chapter 8 Formulas
Potential Energy and Conservation of Energy
Conservative Forces

Net Work Done by a conservative force on a particle moving around any closed path is zero
Work Done by a conservative force on a particle moving b/w two points does not
Chapter 6
page 1
Chapter 6
Forces and Motion
Friction


Like the Normal Force, Friction is a constant
Force that is exerted on an object when that
object is in contact with a surface
The Frictional Force is parallel to the surface
Friction always oppose
Physics 201, Homework #6
Due: 3/20/2014 at 1:50 PM
1. In the figure, a spring with a spring constant k is at the top of a frictionless incline of angle .
The lower end of the incline is a distance D from the end of the spring, which is at its relaxed
leng
1
Chapter 11 Formulas
Rolling, Torque, and Angular Momentum
Rolling Motion

The Center of Mass moves in a straight line, but
the path of a point on the wheel is more
complicated
Assume object rolls smoothly
s=R
v com =R



Rolling Motion is
a combinat
Chapter 16&17
page 1
Chapter 16 and 17
Waves
Types of Waves
1. Mechanical Waves
Governed by Newtons Laws, and can exist only within a material medium
Examples: Wave on String, sound
2. Electromagnetic Waves
Oscillations of Electric and Magnetic fields
E
Physics 201, Homework #7
Due: 3/27/2013 at 1:50 PM
1. A body of mass m1 moves with a velocity v0 and makes an elastic collision with another
body at rest. After the collision, the mass m1 continues to move in the original direction,
but with onethird of