Chapter 1
Units, Physical Quantities, and Vectors
1.1 The Nature of Physics
Physics is an experimental science.
o Physicists try find patterns that relate to the phenomena of nature.
These patterns are called physical theories or, when they are well esta
Motion in Two or Three Dimensions
3.1 Position and Velocity Vectors
r
, of the particle at this
If a particle is at point P at a certain instant, the position vector,
instant is a vector that goes from the origin of the coordinate system to P.
o The Cart
2.11: Time (s) 16 Acceleration (m/s2)
0 0
2 1
4 2
6 2
8 3
10 1.5
12 1.5
14 0
t
a) The acceleration is not constant, but is approximately constant between the times 4 s and t 8 s.
b)
At t 9 s, ax
3 m s , at t 13 s, ax 1.5 m s , at t 15 s,
Motion in Two or Three
Dimensions
3.1 POSITION AND VELOCITY VECTORS
r
, of the particle at this
If a particle is at point P at a certain instant, the position vector,
instant is a vector that goes from the origin of the coordinate system to P.
o The Cart
Applying Newtons Laws
5.1 Using Newtons First Law: Particles in Equilibrium
A body is in equilibrium when it is at rest or moving with constant velocity in an inertial frame of
reference.
5.2 Using Newtons Second Law: Dynamics of Particles
Dynamics uses N
Work and Kinetic Energy
The importance of the energy idea stems from the principle of conversation of energy:
o Energy is a quantity that can be converted from one form to another but cannot be created
or destroyed.
Kinetic energy is the energy of motion;
Potential Energy and Energy
Conservation
When a diver jumps off a high board into a swimming pool, she hits the water moving pretty fast,
with a lot of kinetic energyenergy of motion.
o Kinetic energy increases by an amount equal to work.
Potential energy
Chapter 2
Motion Along a Straight Line
Mechanics is the study of the relationships among force, matter, and motion; kinematics is the
part of mechanics that allow us to describe motion; dynamics helps us understand why objects
move in different ways.
To d
Chapter 6
Work and kinetic energy
Lecture by Dr. Hebin Li
Assignment
Due at 11:59pm on Sunday, October 11
Homework on Masteringphysics
Due before the lecture on Monday, October 12
Read Chapter 7 (p 207~230)
PHY 2048, Dr. Hebin Li
Goals for Chapter 6
To u
Example 2.11: Patt & Patel, page 37
Suppose we have eight machines that we want to monitor with respect to their availability. We can keep
track of them with an eight-bit BUSYNESS bit-vector, where a bit is 1 if the unit is free and 0 if the unit is
busy.
Physics 2048 Exam 1
Page 1/7
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Physics 2048 Physics with Calculus I
Exam #1, September 28, 2015
Prof. Hebin Li
Section information:
U02 (OE 222), U03 (GL 137), U04 (CP 103), U05 (CP
1) Objectives of the lab:
Investigate one type of motion (uniform motion) which does not use acceleration
Determine relationship between position and time for a body moving with constant velocity
Use mathematics with the data you collected to get the cons
2.1: a) During the later 4.75-s interval, the rocket moves a distance 1.00 10 3 m 63 m , and so the magnitude of the average velocity is
1.00 103 m 63 m 4.75 s
b)
1.00 103 m 5.90 s
197 m s .
169 m s
2.25: a) From Eq. (2.13), with v0 x
0,
ax
2 vx 2( x x0 )
(20 m s) 2 2(120 m)
1.67 m s 2 .
b) Using Eq. (2.14), t 2( x x0 ) v 2(120 m) (20 m s) 12 s. c) (12 s)( 20 m s) 240 m.
2.4: The eastward run takes (200 m 5.0 m s) = 40.0 s and the westward run takes (280 m 4.0 m s) = 70.0 s. a) (200 m + 280 m)/(40.0 s + 70.0 s) = 4.4 m s to two significant figures. b) The net displacement is 80 m west, so the average velocity is ^ (8
Physics Lab Report Format
Fall 2010
You are expected to turn in a lab report summarizing your work within the due time determined
by your TA in the very 1st session of the labs. You may put your report in your TAs mailbox located in room 223 of the Physic