Name_____________________________________________
Exam #2
Physics I
Fall 2002
If you would like to get credit for having taken this exam, we need
your name above and section number below.
Section #
_____ 1
_____ 2
_____ 3
_____10
_____ 8
_____ 5
_____ 6
_____ 7
M/TH 8-10 (Bedrosian)
M/TH 10-12 (Hayes)
M/Th 12-2 (Hayes)
M/Th 12-2 (Sperber)
M/Th 2-4 (Schroeder)
Tu/F 10-12 (Bedrosian)
Tu/F 12-2 (Sperber)
Tu/F 2-4 (Sperber)
If we catch you cheating on this exam,
you will be given an F in the course.
Questions
Part A
Value
16
B-1 to -5
30
B-6
10
C-1
10
C-2
16
C-3
6
C-4,5,6
12
Total
100
Score
Sharing information about this exam with people
who have not yet taken it is considered cheating
on the exam for both parties involved.
The Formula Sheet is the last page. You can detach it carefully for easier reference if you wish.
Name_____________________________________________
Part A – Warm-Ups – 16 Points Total (4 at 4 Points Each)
Choose the best answer in the context of what we have learned in Physics I.
Write your choice on the line to the left of the question number.
__________ 1.
__________ 2.
__________ 3.
__________ 4.
Part B – Short Answer – 40 Points Total (5 at 6 Pts. + 1 at 10 Pts.)
Note: In Parts B and C, you will be asked to list the equation(s) you are using from the
Formula Sheet when you calculate the answer to a question. You should select exactly the
equations you are using, and no others, and list them by number where indicated. (Some
vector equations reduce to scalar equations in one dimension – use the same number
whether you are using the vector or scalar form.) This will help you focus your efforts and
it will also help us grade your exam quickly and accurately.
For example, if you were given a problem with an object that moves in the X direction for 6
seconds with an initial velocity of -1 m/s and a constant acceleration of +2 m/s2, and you
were asked to calculate its X displacement, you would put “2”. If you took an alternative
approach and used “1,3” that would also be a correct answer.
Show all work.
B-1 (6 Points)
B-2 (6 Points)
Example problem with solution. (Note: This is not from the real test!)
An object moves in the X direction for 6 seconds with an initial velocity of -1 m/s and a constant
acceleration of +2 m/s2. What is its X displacement at six seconds, taking X=0 at 0 seconds?
x  x 0  v 0 ( t  t 0 )  12 a ( t  t 0 ) 2  (1)(6)  12 (2)(6) 2  30 m
Equations Used: ____2________
B-3 (6 Points)
B-4 (6 Points)
B-5 (6 Points)
B-6 (10 Points)
Answer: _________30__________ units ____m___
Name_____________________________________________
Part C – Extended Problem
The note at the beginning of Part B applies to Part C also.
You are on a team of Physics 1 students working on a summer project to develop … . You have
the following items to work with: …
C-1 (10 points)
Equations Used: _____________
Copy answer to C-2 →
Quantity A: ___________________ units ________
Quantity B: ___________________ units ________
C-2 (16 points)
Use the answer from C-1 to get the next thing.
Answer from C-1: _________________ (no points)
Equations Used: _____________
Copy answer to C-3 →
Quantity A: ___________________ units ________
Quantity B: ___________________ units ________
Quantity C: ___________________ units ________
C-3 (6 points)
Use the answer from C-2 to get the final thing.
Answer from C-2: _________________ (no points)
Equations Used: _____________
Answer: ___________________ units ________
Follow-Up Multiple Choice Questions (3 at 4 Points):
Write your choice on the line to the left of the question number.
______C-4.
______C-5.
______C-6.
Name_____________________________________________
Formula Sheet for Exam 2
1.
v  v 0  a t  t 0 
21.
2.
x  x 0  v 0 ( t  t 0 )  12 a ( t  t 0 ) 2
K  12 m v 2  12 m (v x  v y )
22.
3.
x  x 0  12 ( v0  v)( t  t 0 )
23.
K f  K i  Wnet


U    Fcons  dx
4.
x  x 0  v( t  t 0 )  12 a ( t  t 0 ) 2
24.
U g  m g (y  y 0 )
25.
U s  12 k ( x  x 0 ) 2
26.
27.
28.
 K   U  Wnoncons
s  r
v tan gential   r
a tan gential   r
2
2
6.
v 2  v 02  2a x  x 0 
 

 F  Fnet  m a
7.
T
8.
a centripetal 
29.
30.
  0  t  t 0 
Fcentripetal


p  mv

 
dp
 F  Fnet  d t



J   F dt   p


P   pi


dP
  Fext
dt
31.
   0  0 ( t  t 0 )  12 ( t  t 0 ) 2
32.
   0  12 (0  )( t  t 0 )
33.
   0  ( t  t 0 )  12 ( t  t 0 ) 2
M   mi
38.
5.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
2r
v
v2
 2 r
r
v2
m
 m 2 r
r
1
1
x cm   m i x i y cm   m i y i
M
M


P  M v cm
   
a  b  a b cos()  a x b x  a y b y
 
W  Fd
 
W   F  dx
35.
 2  02  2   0 
   
a  b  a b sin( )
36.
I   m i ri
34.
37.
39.
40.
41.
42.
43.
44x. m1 v1, x ,before  m 2 v 2, x ,before  m1 v1, x ,after  m 2 v 2, x ,after
44y. m1 v1, y ,before  m 2 v 2, y ,before  m1 v1, y ,after  m 2 v 2, y,after
m1  m 2
2 m2
v1,i 
v 2 ,i
m1  m 2
m1  m 2
2 m1
m  m1

v1,i  2
v 2 ,i
m1  m 2
m1  m 2
45a. v1,f 
45b. v 2,f
2
K rot  12 I  2
 
W     d
  
  r F

 dL

  I  d t
  
l  r p


L  l i


L  I