Sa gravity (2)
Transcript of Sa gravity (2)
Featuring the PENDULUM
Gravity Lab Presentation byDavid Bang
Jessamyn HungMandy Lin
Jennifer Yoon
SWINGING WITH
GRAVITY
Is it possible to measure gravity using a pendulum?
HYPOTHESIS
If gravity puts force downwards on the pendulum, we should be able to calculate gravity using the
ti me of one period.
STEP ONE: CREATING MODELPROCEDURE: TRIAL & ERROR
What were the errors for our first
trial?
How did we improve?
Left:Trial 1
Right: Final Trial
PROCEDURE:EXPERIMENT
What tools and equipment did we use?
Which applications and programs helped our process?
STEP TWO:EXPERIMENT RESULTS:RECORDED DATA
Did having multiple trials help make more accurate results?
Trial Length (cm) Time (sec) for 10 swings
Period (T) T2
1 10 7.9 .79 .6241
2 10 8.0 .8 .64
3 10 8.0 .8 .64
4 10 7.9 .79 .6241
Trial Length (cm) Time (sec) for 10 swings
Period (T) T2
1 5 6.4 .64 .4096
2 5 6.5 .65 .4225
3 5 6.3 .63 .3969
4 5 6.3 .63 .3969
Trial Length (cm) Time (sec) for 10 swings
Period (T) T2
1 30 11.5 1.15 1.3225
2 30 11.2 1.12 1.2544
3 30 11.4 1.14 1.2996
4 30 11.0 1.10 1.21
Trial Length (cm) Time (sec) for 10 swings
Period (T) T2
1 20 9.7 .97 .9409
2 20 9.6 .96 .9216
3 20 9.8 .98 .9604
4 20 9.8 .98 .9604
Trial Length (cm) Time (sec) for 10 swings
Period (T) T2
1 50 15.7 1.57 2.4649
2 50 15.1 1.51 2.2801
3 50 15.3 1.53 2.3409
4 50 15.9 1.59 2.5281
Trial Length (cm) Time (sec) for 10 swings
Period (T) T2
1 40 13.3 1.33 1.7689
2 40 13.5 1.35 1.8225
3 40 13.1 1.31 1.7161
4 40 13.5 1.35 1.8225
Trial Length (cm) Time (sec) for 10 swings
Period (T) T2
1 70 17.8 1.78 3.1684
2 70 17.7 1.77 3.1329
3 70 17.5 1.75 3.0625
4 70 17.7 1.77 3.1329
Trial Length (cm) Time (sec) for 10 swings
Period (T) T2
1 60 16.2 1.62 2.6244
2 60 16.1 1.61 2.5921
3 60 16.3 1.63 2.6569
4 60 16.5 1.65 2.7225
Trial Length (cm) Time (sec) for 10 swings
Period (T) T2
1 90 19.7 1.97 3.8809
2 90 19.3 1.93 3.7249
3 90 19.2 1.92 3.6864
4 90 19.3 1.93 3.7249
Trial Length (cm) Time (sec) for 10 swings
Period (T) T2
1 80 18.7 1.87 3.4969
2 80 18.4 1.84 3.3856
3 80 18.3 1.83 3.3489
4 80 18.2 1.82 3.3124
Trial Length (cm) Time (sec) for 10 swings
Period (T) T2
1 110 21.5 2.15 4.6225
2 110 21.5 2.15 4.6225
3 110 21.8 2.18 4.7524
4 110 21.9 2.19 4.7961
Trial Length (cm) Time (sec) for 10 swings
Period (T) T2
1 100 20.4 2.04 4.161
2 100 20.2 2.02 4.080
3 100 20.3 2.03 4.1209
4 100 20.4 2.04 4.161
STEP TWO:EXPERIMENT RESULTS:RECORDED DATA
Finding out the value of “g”:4𝜋 2
𝑆𝑙𝑜𝑝𝑒
❑Formula:
4𝜋 2
4.04𝑚/𝑠𝑒𝑐2 =
= 9.771885546
Where did the formula come from?9.77
What were the factors that affected the accuracy of our experiment?
ASSUMPTION & LIMITATIONS
What were our thoughts throughout the process?