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Finding gravity through experimental data

by BayernBlues
Tags: data, experimental, gravity
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BayernBlues
#1
Oct13-07, 03:46 PM
P: 66
1. The problem statement, all variables and given/known data
Experimentally measured time of fall
vs. distance for a freely falling object
Distance, x (m) Time, t (s)
0.1 0.148
0.2 0.196
0.3 0.244
0.4 0.290
0.5 0.315
0.6 0.352
0.7 0.385
0.8 0.403
0.9 0.429
1.0 0.451
Let the mathematical model be: x = 0.5gt^2 and assume that x = 0 at t = 0 :
a. In the light of what you learnt in problem 1.1 (parts a and b) and the form of the equation
x = 0.5gt^2 , discuss (without calculations) two different methods that can be used to find g, the
acceleration due to gravity, from a straight line graph representation. In each method, indicate
explicitly the vertical variable, horizontal variable, slope, and intercept. Draw sketches.
b. Find a numerical estimate for g based on the above table, using the EXCEL program?



2. Relevant equations

x = 0.5gt^2

3. The attempt at a solution


I know that the value of g is 9.81 m/s^2 but this is asking how to show it through experimental data and graph. I think maybe taking the ln of both sides to change this into y=mx+b form might help but am unsure. Also, I thing g would be the constant in the equation if it was changed to y = mx + b form therefore it'd be the slope value.
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Gib Z
#2
Oct13-07, 08:18 PM
HW Helper
Gib Z's Avatar
P: 3,352
It gives you the values of x and t, you have the equation that relates them. Solve for g.


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