sa p roject 1
TRANSCRIPT
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Justin Park, Sean Kim, Paul Wang, Derek Guo
Open Inquiry -Finding Gravity
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To determine the value of ‘g’ as accurately as possible.
objective
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In a case of free-falling of an object, if the ob-ject is dropping from the known height of the stair with zero initial velocity, then the gravity of the object can be calculated by us-ing the formula,
d=1/2•at2 and the value should reflect closed to the known value of 9.81m/s2.
Hypothesis
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Measure tape, tennis ball, timer(stop watch)
Materials
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Procedure and Process1. Bring the tennis ball to the certain height on the
stair and measure the height of the tennis ball from the ground.
2. Start the stop watch as soon as you drop the ten-nis ball and stop it when it hits the ground.
3. Record your data.
4. Change the height of the dropping level then re-peat the procedure 1-3 six times.
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Sean
DerekJustin
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Paul
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??
Tennis ball
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Background Information
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Background Information
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We dropped the ball from 7 different displacement
RESULTS AND OBSERVATIONS
1 2 3 4 5 6 7
d(m) 2.0 2.5 3.0 3.5 4.0 4.5 5.0
t(s) 0.56 0.69 0.73 0.85 0.88 0.92 1.00
t̂ 2(s 2̂) 0.31 0.48 0.53 0.72 0.77 0.85 1.00
2d(m) 4.0 5.0 6.0 7.0 8.0 9.0 10.0
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RESULTS AND OBSERVATIONS
0.20 0.30 0.40 0.50 0.60 0.70 0.80 0.90 1.00 1.10 2.0
3.0
4.0
5.0
6.0
7.0
8.0
9.0
10.0
11.0
f(x) = 9.02451722048176 x + 0.984643585850592R² = 0.980223722237542
Gravity inquiry - 2d vs t2
t2 (s2)
2d (
m)
Slope = 9.024
9.024 = acceleration = gravity
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Limitation: due to the low displacement, in the case less than 5m, the time the object hitting the ground is relatively short. (does not cover human reaction time to stop the stopwatch.
Error : (assume that there is no air resis-tance), the measure tape was not 100% straight
Human error : the reaction time.
ASSUMPTIONS &LIMITATIONS
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Hypothesis In a case of free-falling of an object, if the ob-
ject is dropping from the known height of the stair with zero initial velocity, then the gravity of the object can be calculated by us-ing the formula,
d=1/2•at2 and the value should reflect closed to the known value of 9.81m/s2.
Our result was pretty close to 9.81m/s2
ASSUMPTIONS &LIMITATIONS
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Conclusion : Throughout this experiment we were able to find the value of ‘g’ by using the method of free-falling of a tennis ball from varying heights of the stairways . Our results, the slope of the best fit line graph, states that the value of ‘g’ is 9.02m/s2. As we indicated, the limitation and possible error sources prevent us from getting precise value of ‘g’, 9.81m/s2.
Possible suggestion to make this experiment more precise is to increase the displacement(height) and to use high-speed camera to measure the time.
ASSUMPTIONS &LIMITATIONS
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The End