Lab 121
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Mechanical Engineering
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Dec 6, 2023
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Physics Laboratory Report
Lab number and Title:
Lab 121: Rotational Static
Equilibrium
—
Forces on a Strut
Name:
Satyam Poonith
Group ID:
6
Date of Experiment:
12/06/2022
Date of Report Submission:
12/13/2022
Course & Section Number:
PHYS 111A031
Instructor’s Name:
Punyakanthi Thilakaratne
Partners’ Names:
Anthony Qassis, Daniel
Montoya, Ronnie Carrasco Ovalle
1.
INTRODUCTION
1.1
Objectives
The objective of this laboratory experiment is to gain a better understanding of toque
in the context of rotational static equilibrium. Additionally, by using our knowledge of
rotational equilibrium of a system, we will determine the tension of a string on a strut
system.
1.2
Theoretical Background
Torque is a vector product of distance and force
Magnitude of torque
: τ = rFsinΘ
The sum of all the torque of a body in rotational static equilibrium is 0 (
τ =
0). This means
that the sum of all the torque should equal the sum of all the torque in the clockwise
direction.
2.
EXPERIMENTAL PROCEDURE
The procedure used in the laboratory experiment was followed by the PowerPoint and the
Laboratory manual and no change was made.
Experimental Setup:
Experiment Equipment
Part 1 Setup
Part 3 Setup
3.
RESULTS
3.1
Experimental Data
Table I
Weight of Strut (AI Rod) =
113.5g
L =
57.7cm
c =
50°
W
1
=
100.0g
L
1
=
32.8cm
Θ
2
= 0°
W
2
=
100.2g
L
2
=
43cm
L
3
=
53cm
Tension Calculated =
2.6N
Tension Measured =
2.9N
Table II
Weight of Strut (AI Rod) =
113.5g
L =
57.7cm
Θ
1
=
50°
W
1
=
100.0g
L
1
=
32.8cm
Θ
2
=
43°
W
2
=
100.2g
L
2
=
43cm
L
3
=
53cm
Tension Calculated =
1.9N
Tension Measured =
2.41N
Table III
Weight of Strut (AI Rod) =
113.5g
L =
57.7cm
Θ
1
=
59°
W
1
=
100.0g
L
1
=
32.8cm
Θ
2
=
-20°
W
2
=
100.2g
L
2
=
43cm
L
3
=
53cm
Tension Calculated =
2.2N
Tension Measured =
3.84N
The image on the
left is the mean
force calculated
through the PASCO
software
3.2
Calculations
T = L
1
m
1
gsin(90-
Θ
2
)+ L
2
m
2
gsin(90-
Θ
2
)+L/2m
r
gsin(90-
Θ
2
)/L
3
sin(
Θ
1
)
T
1
= (0.328*0.1*9.81*sin(90-0))+ (0.43*0.1002*9.81sin(90-0))+
((0.577/2)*0.1135*9.81sin(90-0)/)(0.53*sin(50))) = 2.6N
T
2
= (0.328*0.1*9.81*sin(90-43))+ (0.43*0.1002*9.81sin(90-43))+
((0.577/2)*0.1135*9.81sin(90-43)/)(0.53*sin(50))) = 1.9N
T
3
= (0.328*0.1*9.81*sin(90-(-20))+ (0.43*0.1002*9.81sin(90-(-20))+
((0.577/2)*0.1135*9.81sin(90-(-20))/)(0.53*sin(59))) = 2.2N
4.
DISCUSSION
I believe that our group met the objective as we have furthered our understanding of finding values
for tension in the strut system. The results were expected, as our percentage difference from our
calculated and measured were similar. The slight difference in values with the calculated and
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measured value could be due to the lack of preciseness when measuring as human error could
affect when measuring the angle or lengths. Additionally, the environment where the experiment
took place was very open where other groups were moving around, which could affect the values
when getting the measured value.
5.
CONCLUSTION
In this laboratory experiment, our group determined the tension of a cord on a strut system
by applying our knowledge of rotation equilibrium in our calculations. Additionally, this
experiment has helped reinforce our knowledge of the condition s of rotational equilibrium
in a system.
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