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Lab 3 - Newton's Second Law: PostLab
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Current Score :
100 / 100
Due :
Tuesday, October 1, 2019 10:20 AM EDT
Override: 100
Lab 3 - Newton's Second Law: PostLab (PostLab)
Alyssa Valentine
PY 211, section 201, Fall 2019
Instructor: Robert A. Egler
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Lab 3 - Newton's Second Law: PostLab
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Previous Answers
Use the exact values you enter to make later calculations.
A group of students performed the same "Newton's Second Law" experiment that you did in class. For this lab, assume
g
= 9.81 m/s
2
. They
obtained the following results:
m
1
(kg)
t
1
(s)
v
1
(m/s)
t
2
(s)
v
2
(m/s)
0.050
1.2000
0.2500
1.7337
0.4694
0.100
1.2300
0.3240
1.6045
0.7640
0.150
1.1500
0.3820
1.4560
0.9052
0.200
1.1100
0.4240
1.3772
1.1031
where
m
1
is the value of the hanging mass (including the mass of the hanger),
v
1
is the average velocity and
t
1
is the time at which
v
the instantaneous velocity for the first photogate, and
v
2
is the average velocity and
t
2
is the time at which
v
2
is the instantaneous velocity
for the second photogate.
(a) Use Excel to construct a spreadsheet to do the following. (You will not submit this spreadsheet. However, the results will be
needed later in this problem.)
(i) Enter the above data.
(ii) Compute the acceleration,
a
, for each trial.
(iii) Create a graph of the hanging weight
m
1
g
vs. the acceleration.
(iv) Use the trendline option to draw the best fit line for the above data and determine the slope and
y
-intercept from it.
1
is
(v) report your results below.
slope =
0.7031 kg
0.703 kg
y
-intercept =
0.199 N
0.199 N

10/18/2019
Lab 3 - Newton's Second Law: PostLab
(b) Use the information you obtained from your graph to determine the total mass of the system
M
=
m
1
+
m
2
.

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Additional Materials
Newton's Second Law
Appendix

(c) Using the information you obtained in parts (a) and (b), predict what the value of the acceleration would be if the value of the
hanging mass were increased to
m
1
kg.
Your answer cannot be understood or graded.
More Information
3.9 m/s^2

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