Physics
125 Test II
October 23, 1997
This is a closed book exam. You have 70 minutes to do the exam.
You may use a calculator.
Some (possibly) useful equations
r
=
x
ˆ
i
+
y
ˆ
j
+
z
ˆ
k
x

x
0
=
v
0
t
+
1
2
at
2
a
r
=
v
2
r
x

x
0
=
vt

1
2
at
2
x
=

b
±
b
2

4
ac
2
a
x

x
0
=
1
2
(v
0
+
v)t
v
=
v
0
+
at
v
2
=
v
0
2
+
2
a(x

x
0
)
f
K
=
K
N
U
S
=
1
2
kx
2
U
G
=
mgy
Where appropriate, draw neat diagrams, labeling your axes and clearly
indicating what variables you are using. Use Cartesian coordinates.
Give solutions to 2 or 3 significant figures.
Grading is based on what appears on your paper. In general, the answer to a
problem by itself is not sufficient to obtain credit. The grader should be able
to determine, without guessing, the steps you took to arrive at a solution.
Please remember to put your name on the test booklet and SIGN THE
PLEDGE.
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Solutions
1. (20 points). Work
Three forces are applied to a mass moving towards the left on a
frictionless floor, as shown in the figure. The values of the forces are
F1 = 5.00 N
F2 = 9.00 N
F3 = 13.00 N
F3 is the gravitational force.
The mass moves 3.00 meters to the left.
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 MUTCHLER
 Physics, Energy, Force, Kinetic Energy, Potential Energy

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