PHYSICS REPORT
CALCULATE ACCELERATION GRAFITY
COMPLIED BY :
1. Reska Mahendra
(25)
2. Sidik Rohmadani
(26)
3. Sulastri
(27)
4. Suranti Puspita Wardani
(28)
5. Titis Melani Dwi Susilowati
(29)
SENIOR HIGH SCHOOL 2 WONOGIRI
YEAR OF EDUCATION 2012 / 2013
Foreword
we always praise pray presence of Almighty God, for His grace and blessings writers can
complete physics lab results with the theme'' Calculating Acceleration of Gravity'' Simple Swing.
We make this report to fulfill practicum was held on 20 September 2012 by Mr Bambang
Hartono tutor.
Practicum is about how to calculate the period, the speed of gravity, using a simple swing. And
factors that influence the calculation of gravity. It poses the calculation results from our lab
laksaanakan a predetermined formula.
The authors hope that this report can provide a benefit to the reader and as a bridge to success in
the present and the future. As a human being, of course the authors make mistakes and
shortcomings. Therefore, the authors expect criticism and suggestions that build if there are
errors and deficiencies in the preparation of this report, and of course the next task to perfection.
End the authors would like to thank the cast who have helped in the preparation of this task.
Authors,
A. Objective: Measure the speed of gravity
B. Tools and Materials
rope
pendulum
Statip Buffer
stopwatch
ruler
C. Theory
Simple swing also called automatic pendulum. Simple swing consists of a small ball that hung
from the tip of the rope light. Back and forth motion of a simple swing with a negligible friction
is vibration or motion harmonic motion. Insulated ball along the arc of a circle with the same
amplitude at the point of maximum current balance and its speed through the balance.
Simple osilation restoring force is F =-w sinƟ
𝑙
Swing period can be calculated by the formula T = 2π √𝑔
4𝑥 2 𝐿
𝑇2
So that gravity can be calculated by the formula g =
D. Procedure
Measure strap on statip buffer corresponding to the desired size
Tie the load on the rope at the statip buffer talikan
Swing the pendulum with small deviation, and count the number of swings for 20 second
Repeat for a different length of string
E. Data
Measuring the period length of rope
No
lenght (l) m
1.
2.
3.
4.
5.
0,25
0,30
0,35
0.40
0,45
Vibration
(n)
20
20
20
20
20
𝑡
Time(s)
T=𝑛
22
24
25
26
28
1,1
1,2
1,25
1,3
1,4
F. Data Analys
𝑔1 =
4𝑥 2 𝑙
𝑇2
4 .3,142 .0,25
1,12
=
= 9,85
𝑔2 =
𝑔
3=
𝑔4=
4.3,142
1,,252
. 0,35 = 8,83
43,142
0,40
1.32
𝑔5 =
4 𝜋2𝑙
4. 3,142 . 0.30
=
= 8,21
𝑇2
1,22
= 9,33
4.3,142
0,45
1,4 2
= 9,05
⅀𝑔
𝑔1 + 𝑔2 + 𝑔3 + 𝑔4 + 𝑔5
9,85 + 8,21 + 8,83 + 9,33 + 9,05
=
=
= 9,54 𝑚⁄𝑠 2
𝑁
5
5
G. Conclusion
From the experiments it can be concluded that the relationship between the period of stay
depends on the length of the rope. Acceleration of gravity somewhere measured using swing
does not match with the result, that the gravity is 9.8 magnitude and gravity of the above
experiment is 9.54. It is influenced by the environment that is the fan and statip buffer wagging.