UC — Irvine Print Name: A V V) 0 6/
Physics 3A Student ID:
February 25, 2011 Version A
Secaan Examination
The exam is closed book, closed notes, open mind. You may use one of the allowed calculators.
There are 4 problems. Please silence your cellular ph
Example 4/19/2013: Football pass - Vector diagram
Situation and Variables:
t = time of flight of ball.
1
2
gt 2
vot
= 30o
x p = v p (t + 3 s)
The key to this drawing is to recognize that the
displacement of both the ball and the receiver
must be the same
Example 1 4/15/2013: Vector diagram
Situation and Variables:
Notice that in this case, we draw the acceleration vector
vo t
30
o
h = 30 m
1
2
2
gt h
1
2
gt 2
all the way to the ground where it lands. We draw a line
From the initial position to the acceler
Example 2 4/17/2013: Vector diagram
Situation and Variables:
1
2
gt 2
vot
The key to this drawing is to recognize that h 10 m . You
are solving for h and COMPARING it to 10 m. That is
h=?
o
35
35 m
The vector h is connected to 1 2 gt 2 , and 10 m is show
Example 1 4/12/2013: Version 1
Situation and Variables: select up to be positive
t j = time of the jump = ?
a = acceleration of both objects = 10 m/s2 down = g
td = time player delays = ?
vb = initial speed of ball = 9 m/s
v p = initial speed of player =
Example 1 4/10/2013: Version 1: Police car only accelerates.
Situation and Variables:
select direction of car to be positive
vc = velocity of the car = 40 m/s
a = acceleration of police = 6 m/s2
x = of car and police, which must be equal for police to cat
Example 1 4/8/2013: GENERAL SOLUTION
Situation and Variables:
vo = Initial speed of ball = ?
a = acceleration of ball = 2.5 m/s2 opposite the balls motion
x = displacement of the ball = 15 m in direction of motion
Final speed = 0 m/s (what it means to sto
Example 1 4/5/2013: GENERAL SOLUTION
Situation and Variables:
vb = 6 m/s = speed of bus, xb = ? displacement of bus
v p = 4 m/s or 8 m/s = speed of person
x p = ? displacement of the person
d = 15 m = length of bus
t f = ? time of collision
positive x-dir
The bug wants to be here.
The same situation as above: blocks A, B, and C.
For this question, let mA = mB = mC = m
Correct ->
Why? Look at the x component force equation for Block C.
Its just: F_BC = m a (all the masses are equal now)
Thats telling me tha
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7 uﬂb‘u ,1 ., _ * Problem “*1 Hip
Sketch the situation, deﬁning all your variables.
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What physics e
Physics 3A Spring 2016 Test #3 Version B
Multiple Choice Questions 3 Points Each
Mark your answers on your Scantron.
1. Jamie and David are standing facing each other on an ice rink. They are both wearing 1ce skates, (and
stand with their palms touching.
Physics is Everywhere
Learn the principles which govern the Universe and lay the
foundation of other physical sciences, engineering and
modern technologies
Physics
Classical physics: developed before 1900
Classical Mechanics
Thermodynamics
Electromagneti
Chapter 4. Newtons laws of motion
Force = mass x acceleration
A force is that which causes an acceleration
Classes of Forces
Contact forces involve
physical contact between
two objects
Field forces act through
empty space
No physical contact is
requir
UC -1rvine Print Name: / Y” W t? i A,
Physics 3A Student ID:
January 28, 2011 Version A
First Examination
The exam is closed book, closed notes, open mind. You may use one of the allowed calculators.
There are 4 problems. Please silence your cellular phon
Final (Physics 3A)
Name , ID , Discussion Section
Multiple choices (5.0% each)
1. Driver A is cruising along enjoying the fall colors. Driver B starts her car at the instant
he passes her. Their velocities are shown as functions oftime in the graph belo
Final (Physics 3A): Name ,ID
Multiple choices (5% each)
1. A particle conﬁned to motion along the x-axis moves with constant acceleration from
x = 2.0 m to x = 8.0 m during a 2.5-3 time interval. The velocity of the particle at x = 8.0
m is 2.8 m/s. What
Final (Physics 3A)
Name_, ID _, Discussion Section _
Multiple choices (5.0% each)
1. A stone is thrown from the top of a building with an initial velocity of 20 m/s
downward. The top of the building is 60 m above the ground. How much time
elapses between
Physics 3A: Midterm I (10/14/2011, 3:00 pm-3:50 pm)
; Discussion
Multiple Choic (8% each) x
1. A woman walks 200 In west, then 3 north, then 200 In south, then 200 m east.
What is her displacement? 2
a.100mE 1"
b.100mW 9"
w» '
_ .0 m S
e. The displaceme
Physics 3A Fall 2016 Test #1 Version A
Multiple Choice Questions 2 Points Each
Mark your answers on your Scantmn.
1. A wineglass is at rest on a caf table in Paris. Its weight and the normal force on the glass due to the
table have equal magnitudes and op
Physics 3A Fall 2016 Test #1 Version B
Multiple Choice Questions 3 Points Each
Mark your answers on your Seantron.
1. A projectile is launched from the ground at Point with initial velocity vo. Some time later it reaches
its highest point at Point B, then
Sample Short Answer Questions 1 I measme B in meters per
. d s we
t' n' A = 32 I C. I measure A m meters per secon q n 82 F
1) Wave a M 1 '1 late c its units will be 5 E, v 2 " 7, a Si
second. When 1 ca cu C/ A( m n" V .; .1 :2- m
a) N C, = 6 J j" ? FA
Sample Short Answer Questions
1)
I have an equation: A = B2 / C. I measure A in meters per second squared. I measure B in meters per
second. When I calculate C, its units will be
a) N
b) kg/s
c) Hz
d) m
e) impossible to determine.
2)
A rocket is launched
Chapter 3
Kinematics-2D
Position and Displacement
The displacement of the
object is defined as the
change in its position
r = rf - ri
Now r and r are
vectors, which have
both magnitude and
direction
Vectors and Scalars
A vector has magnitude as well
as