PHYS6AL Lab 3 (Energy Transformation)
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PHYS6AL Lab Notebook
Fall Semester 2021
Annie Lee and Davis Smith
Instructor: Popescu, Berenstein
TA: Leo Zhu
Lab 3:
Energy Transformation
Exercise 1:
The kinetic energy came from the potential energy stored in the band as it was being pulled
back.
Exercise 2:
a)
PE = mgh
= m * 9.8 * 0.34
PE = 3.332m
b)
sin(30) = 0.34/x
xsin(30) = 0.34
x = 0.68
R - x = 1.32 m
c)
W = (½)mv²
W = -ΔU
v = 2.581 m/s
Activity 1 / Exercise 3:
Data Points
Time (s)
Distance (m)
Velocity (m/s)
Height (m)
Kinetic
Energy (J)
Potential
Energy (J)
1
0.2
0.054
0.277
0.00054
0.00825
0.00114
2
0.6
0.150
0.219
0.00150
0.00516
0.00316
3
0.9
0.212
0.189
0.00212
0.00384
0.00447
4
1.2
0.265
0.163
0.00265
0.00286
0.00559
5
1.5
0.311
0.140
0.00311
0.00211
0.00656
6
1.8
0.349
0.116
0.00349
0.00145
0.00736
7
2.1
0.379
0.086
0.00379
0.00080
0.00799
8
2.4
0.401
0.058
0.00401
0.00036
0.00846
9
2.7
0.415
0.035
0.00415
0.00013
0.00875
10
3.0
0.421
0.010
0.00421
0.00001
0.00888
Block Height b (m)
0.01
Distance Between Legs D (m)
1
Exercise 4:
a)
b)
As the kinetic energy decreases, the potential energy increases (and vice versa). They
intersect at around 0.8 to 0.9 seconds, or when the energy is around 0.004 J.
Exercise 5:
a)
Yes, our data does support the Law of Conservation of Energy.
b)
Our data leads us to believe this because as the kinetic energy decreases, the potential
energy increases to keep the total energy in the system constant. If the values of kinetic
and potential energy are added at any point in the graph, they will always be pretty much
the same no matter at what point in time.
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