±²³±±³²´±µ
/DE ¶ · 1HZWRQ¸V 6HFRQG /DZ¹ 3RVW/DE
KWWS¹³³ZZZºZHEDVVLJQºQHW³ZHE³6WXGHQW³$VVLJQPHQW·5HVSRQVHV³ODVW"GHS ±±»»¼±»½
±³±²
Current Score :
77.5 / 100
Due :
Tuesday, October 20 2015 07:05 AM EDT
Lab 3 Newton's Second Law: PostLab (PostLab)
Brittany Kiser
PY 211, section 201, Fall 2015
Instructor: Haosheng Shi
:HE$VVLJQ
The due date for this assignment is past.
Your work can be viewed below, but no changes can be made.
Important!
Before you view the answer key, decide whether or not you plan to request an extension. Your Instructor may
not
grant you an extension if you have viewed the answer key. Automatic extensions are not granted if you have viewed
the answer key.
View Key

±²³±±³²´±µ
/DE ¶ · 1HZWRQ¸V 6HFRQG /DZ¹ 3RVW/DE
1.
6.25/25 points |
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
1.8096
0.4261
0.100
1.2300
0.3240
1.6397
0.6622
0.150
1.1500
0.3820
1.4808
0.8373
0.200
1.1100
0.4240
1.3974
0.9476
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
1
is 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.

KWWS¹³³ZZZºZHEDVVLJQºQHW³ZHE³6WXGHQW³$VVLJQPHQW·5HVSRQVHV³ODVW"GHS ±±»»¼±»½
²³±²
(b) Use the information you obtained from your graph to determine the total mass of the
system
M
=
m
1
+
m
2
.
M
=
(No Response)
(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
=
0.30
kg.
a
=
(No Response)

±²³±±³²´±µ
/DE ¶ · 1HZWRQ¸V 6HFRQG /DZ¹ 3RVW/DE
KWWS¹³³ZZZºZHEDVVLJQºQHW³ZHE³6WXGHQW³$VVLJQPHQW·5HVSRQVHV³ODVW"GHS ±±»»¼±»½
¶³±²
Additional Materials
Newton's Second Law
Appendix

±²³±±³²´±µ
/DE ¶ · 1HZWRQ¸V 6HFRQG /DZ¹ 3RVW/DE