I’m trying to measure g using freefall. I’ve conducted the experiment and now I’m struggling with the formula. The formula we’ve been told to use is:(adsbygoogle = window.adsbygoogle || []).push({});

S = ut ½ at2

Substituting a for g (because that’s what I’m trying to find).

S = ut ½ gt2

The initial Speed is 0 therefore I can remove ut (right?) to leave:

S = ½ gt2

(right so far?)

Using my results I’ve drawn a graph that has the height of freefall (S) on the y axis and t2 on the x axis. Working out the gradient as ΔS ∕ Δt2 = 0.40 ∕ 0.105 = 3.81ms-2

My lecturer showed me what to do next but my notes look hazy.

I have written down y = 0 + m x which I think is the same as s = ut + gradient x t2

Then underneath I have m = ½ g which I have equating to g = 2 gradient

I did try and use the directions that I’ve written down earlier, but I calculated g to be about 7, which I know to be wrong from text books and another experiment I conducted using a simple pendulum.

I hope the information I’ve given is enough. Any help as usual is always appreciated :)

Matt

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# Homework Help: Measuring g in freefall

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