Featuring the PENDULUM

Gravity Lab Presentation byDavid Bang

Jessamyn HungMandy Lin

Jennifer Yoon

SWINGING WITH

GRAVITY

NEWTON’S LAW OF GRAVITY

Determine the value of gravity (g) as accurately as possible.

OBJECTIVE

Why did we choose to use the pendulum?

How does the pendulum relate to gravity?

PROCEDURE:REASONING

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:EXPERIMENTPROCEDURE:EXPERIMENT

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?

Our hypothesis was correct! Using the ti me of one period, we were able to calculate a measurement of gravity. Our fi nal result for gravity was

CONCLUSION

9.77 /𝑚 𝑠𝑒𝑐2