Dr. Alexander Kozhanov
Syllabus
PHYS-2211K Summer 2015, TR 10:55-13:25
PHYS-2211K Summer 2015, TR 10:55-13:25
PRINCIPLES OF PHYSICS I
Mechanics, Oscillations and Wave motion
Instructor: Dr. Alexander Kozhanov
Office: 408 Science Annex
Phone: 404-413-6084
1)
Aforceof
stretches
aspring
from
equilibrium.
Whatisthe
valueofthe
spring
constant?
1)
_
38N/m
B)
71N/m
C)
80N/m
D)
58N/m
Aspring
stretchesby
when
a
object
isattached.
Whatisthe
weightofa
fishthat
would
stretchthe
springby
2)
_
145N
B)
91N
C)
199N
D)
27
Quiz 1 This is a photograph of an apple and feather free fall in a evacuated chamber. The apple and feather are released from the top. Suppose the camera opened flash every 1 s. (1) Suppose A1 is the distance from t = 0s to t = 1 s, A2 is the distance fro
Represen'ng Mo'on Graphically
What We Will Cover Today
How can we nd average speeds and veloci'es?
do we represent mo'on in x vs. t graphs?
How do we represent mo'on in v vs. t graphs?
What is instantaneous v
PHYS-2211
Hwk-04 FA-2016
Due: _
Name: _
WORK & ENERGY (1)
1. (a) Evaluate the dot product A B if A
5i + 8 j .
= 4i 3 j and B =
(b) Find the angle between the two vectors A
= 4i 3 j and B =
5i + 8 j .
(c) How much work is done by the force F =10i + 6 j N
Intro to Rota)on and Circular Mo)on
What You Will Learn Today
What are angular displacement, angular velocity, and
angular accelera)on?
Compare centripetal and tangen)al accelera)on.
What apparent forces do we nd in
Equilibrium
What You Will Learn Today
Review Exam #1
What is equilibrium?
PreparaAon for next class
ConAnue working on the Chapter 5 and 6
assignment.
Read secAons 6.4 and 6.5 (skip 6.3 for now; we will
r
Pulleys and Drag
What You Will Learn Today
How can we describe interac;ng objects?
How does a pulley aect the forces ac;ng on an
object?
How can we describe the drag force?
Prepara;on for next class
Study
Weight and Interac.ng Objects
What You Will Learn Today
Quick review of centripetal accelera.on (apparently, it
was missed in lab last week).
How does your weight appear to change when you are
accelera.ng?
How ca
Simple Harmonic Mo/on
What You Will Learn Today
What is an oscillator?
How does SHM relate to circular mo/on?
How can we nd the speed and posi/on of an
oscillator?
Prepara/on for Next Class
Con/nue the nal h
Apparent Forces and Torque
What You Will Learn Today
Review Exam #3
What is a centrifugal force?
More importantly, what is it not?
What is torque?
PreparaHon for Next Class
ConHnue working on the Ch. 4, 8,
Introduc)on to basic forces
What You Will Learn Today
What is mass and what is force?
What are Newtons laws of mo)on?
We will only cover the rst two today.
How can we illustrate the forces ac)ng on an object
Accelera'on
What You Will Learn Today
How do we study mo'on with changing velocity?
What is accelera'on and how do we work with
problems involving accelera'on?
What is the accelera'on due to gravity? How does
Elas%c Poten%al Energy, Elas%c Collisions
What You Will Learn Today
What is the spring force?
What is elas%c poten%al energy?
How is an elas%c collision dierent from an inelas%c
collision?
Prepara%on for next Clas
Equilibrium and Fric/on
What You Will Learn Today
How can we illustrate the forces ac/ng on an object?
What is equilibrium?
What is sta/c fric/on? What is kine/c fric/on?
Prepara/on for next class
Read sec/
Torque and Rota-on
What You Will Learn Today
How can we apply the idea of equilibrium to torque?
How can we determine the center of mass for an
object?
What is angular momentum?
Prepara-on for Next Class
Fin
Torque and Rota-on
What You Will Learn Today
What is torque?
What is moment of iner-a?
How can we apply the idea of equilibrium to torque?
How can we determine the center of mass for an
object?
Prepara-on for
D YS
AN E S
RS AT
O IN
CT RD
VE OO
C
M
TE
S
VECTORS
A quantity that is fully described by a single number is called a scalar
quantity (i.e., mass, temperature, volume).
A quantity having both a magnitude and a direction is called a vector
quantity.
COORDI
Dynamic forces
What Is a Force?
A force is a push or a pull
Pushes and pulls are applied to something.
From the objects perspective, it has a force exerted on it.
Force
A force requires an agent, something that acts or exerts
power.
If you throw a ba
Mechanics
Types of motion
Straight line
Circular
Rotational
Projectile
Units
Science is based on experimental
measurements, and measurements
require units.
The system of units in science is called le
Systme Internationale dunits or SI
units.
The SI unit o
Kinematics
Uniform motion
If you drive your car at a perfectly steady 60 mph, this means
you change your position by 60 miles for every time intervalof
1 hour.
Uniform motion is when equal displacements occur during
any successive equal-time intervals.
+
Dynamics
+
Force
Influence that causes an objet to undergo a certain
change, either concerning its movement, direction or
geometrical construction.
+
Newton's first law of motion
1stlaw: If an object experiences no net force,
then its velocity is consta
wMu
E u E 15 3 Q
. . Maw: k.
imuvi N 3m n M is (4. NE 7 Mn L.»
a N ew; w «Azumyiué Ti T
. . 1 - . m .E. r X 3 s3: TE.
u u I u II. N l
a: aw 4 E; d 4. «M i m $1.?anqu 7E .
W E {M . m n Y Libi3% X
. T x i 41. *3» x
31m: u m: 4 {:4 Sé
' £23 Tu. v
3&3»
=s +v t+ia t2=0m+[12]t
S
f,raptor ifaptor z,rapt0r raptor
2 s
When the velociraptor catches Timmy, both Timmy and the velociraptor will be at the
same position. In other words, they will have the same value for sf. We can thus set the
two equations above
Elas%c Collisions, Work, and Power
What You Will Learn Today
How is an elas%c collision dierent from an inelas%c
collision?
What is work?
What is power?
Prepara%on for next Class
Con0ue working on the conserva%
Gravita'on: A Deeper Look
What You Will Learn Today
What is angular momentum?
How can we dene gravita'onal poten'al energy far
away from the Earths surface?
What is escape velocity?
What is the speed / period
Collisions and Energy
What You Will Learn Today
What is an inelas7c collision?
What is kine7c energy? What is gravita7onal
poten7al energy?
When is energy conserved?
Prepara7on for next Class
Begin the conserva
Impulse and Momentum
What You Will Learn Today
What is impulse?
What is momentum?
What do we mean when we say momentum is
conserved?
Prepara=on for next Class
Read sec=ons 9.4 9.6
Exams will be returned n
PHYS 2211
Activity 01
Due:
Name: _
VECTORS AND COORDINATE SYSTEMS (1)
1. Determine the numerical values of the x- and y- components of the each vector:
(a)
(b)
2. Draw and label each vector with the given components. Then, write the magnitude and
directio