Oct – Feb 2021
ITEM M
OBJ. (1)
METHOD. I (2)
METHOD. II (2)
DATA (2)
ANALYSIS I (2)
UNIVERSITI TEKNOLOGI MARA ANALYSIS II(3)
DISCUSS. I (3)
CAWANGAN PERAK KAMPUS TAPAH DISCUSS. II (3)
CONCLUS. (2)
TOTAL (10)
PHY 110
MECHANICS I
LABORATORY REPORT
TITLE :MEASURING GRAVITATIONAL
ACCELERATION
EXP. NO. : EXPERIMENT 1
GROUP : A4AS120117
NO NAME STUDENT ID
1. NUR SUHAILAH SYAZWANI BINTI 2020894662
DESA
2. NURAIN FASIHAH BINTI JUNID 2020895282
3. NURIN ATHIRAH SYAZREEN BINTI 2020824976
S.ROSLI
DATE OF
SUBMISSION : ……………………………………………………
LECTURER : NURUL AIMI BINTI ZAKARIA
Oct – Feb 2021
OBJECTIVE
1. To investigate the functional relationship between height of fall and falling time.
2. To determine the acceleration due to gravity, g by studying the motion of a freely
falling body.
3. To investigate different mass object will affect the value of g.
APPARATUS
1. Phet Projectile Motion Simulation (to be downloaded from :
https://phet.colorado.edu/en/simulation/projectile-motion
PROCEDURE
1. The link provided is clicked: https://phet.colorado.edu/en/simulation/projectile-
motion
2. Button download or play clicked.
3. Chosen intro when the projectile motion appeared.
4. Then, this screen will appear.
5. The angle to -90 degree as shown in the picture is adjusted.
6. The height was adjusted and the initial speed was reduced to 0m/s
7. The experiment begins by manipulating the altitude. Height starts 15m and explosive
button clicked.
8. After that, the time taken was measured by dragging the timer button on the ground.
The time taken shown by the timer button was recorded.
9. Step 7 and 8 are repeated using height (14,13,12,11,10,9,8,7,6)m and the result was
filled in the datasheet below for pumpkin.
10. The reset button was clicked and the object was changed to piano. Steps 7 and 9 are
repeated to get a new result for the piano .
11. The new result for piano was recorded in the data sheet.
Oct – Feb 2021
RESULTS
Table 3.1 Experimental Data for Pumpkin
Mass pumpkin : 5kg
Height of fall, Time, t (s) T2 ( s 2 )
h (m)
15 1.75 3.063
14 1.69 2.856
13 1.63 2.657
12 1.56 2.434
11 1.50 2.250
10 1.43 2.045
9 1.35 1.823
8 1.28 1.638
7 1.19 1.416
6 1.11 1.232
Table 3.2 Experimental Data for piano
Mass piano : 400 kg
Height of fall, Time, t (s) T2 ( s 2 )
h (m)
15 1.75 3.063
14 1.69 2.856
13 1.63 2.657
12 1.56 2.434
11 1.50 2.250
10 1.43 2.045
9 1.35 1.823
8 1.28 1.638
7 1.19 1.416
6 1.11 1.232
ANALYSIS
1. From the data, plot graph for:
A)
GRAPH H VS t (s)
Oct – Feb 2021
Graph 3.1 pumpkin
GRAPH H VS t (s)
Graph 3.2 Piano
B)
GRAPH H VS t2(s2)
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Graph 3.1 Pumpkin
GRAPH H VS t2(s2)
Graph 3.2 Piano
Oct – Feb 2021
2. Using the height of fall as a function of the square of falling time graph, determine
the gradient (slope) of the graph and calculate the value g.
M = ( 15-6) M= 4.92
(3.063-1.232)
1 1
h ( t )= ¿2 m= g
2 2
1
y=mx+c 4.92= g
2
1
m= g g = 9.84
2
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3 .Calculate value of uncertainties of g (∆g).
( 15.4−5.6 )
g=9.84 ma x gradient= = 6.09
( 2.89−1.28 )
( 14.8−6.3 )
mi n gradient= =4.51
( 3.063−1.18 )
1 1
∆ m= ( 6.09−4.51 ) ∆ g= ∆ m
2 2
= 0.79
1
= ( 0.79 )
2
= 0.40
g1 = 9.84 ± 0.79 m/s2
4. Calculate the percent difference between the value of g calculated in part (1) above
(gexperiment) and the standard value of gstandard = 9.81m/s2 . What is the percent
error in this experimental value?
g 1−g
× 100 %
g
9.84−9.8 1
×100 %=0. 31 %
9.8 1
5. Is there any experimental errors? Discuss.
∆g
Percentage error =
g
0.40
= 9.84
¿ 0.04 %
Oct – Feb 2021
There have 0.04% error in this experiment
