Apollo 15 Feather and Hammer drop.

[Ululuru]

Hey!
I finally registered in your Forums . I've been reading for a few weeks now, but I have a question about a video, and i thought it would be best to ask here.

I had a discussion with a Hoaxer about this video, and he said they've probably made the feather heavier. So i tried to calculate the fall with the basic Formulas of Kinematics. But i came to a strange result:

With the formula t=sqrt(2*h/g) you come to h = t²*g*0.5.
With a falling time of 1.2 , and a gravity of 1.6 m/s^2 on the moon, i come to a falling height of only 1.15m. And he stretched his arms out, I also think that the Boots had thick soles, I don't really see where the mistake is. The time is not that easy to count, but i downloaded the original clip from nasa, and countet the frames.
Hope you can help me here!

Oh and sorry for any mistakes, i'm from Austria

 

[N_Molson]

It seems hard to retrieve precise figures from the video.

Also, how much images/secs were in the original video ? Which was the original data support ? How many conversions were done, from analogical formats to numerical ones ? Given the huge distances the video feed had to cross (and then it was relayed by communication satellites, then broadcasting compagnies), wasn't the video distorted ?

Add modern things like data compression & encoding, and I doubt we can get precise scientifical data from this video.

Don't worry, people went on the Moon, and lunar orbital satellites have recently proved it again.

Edit : and by the way, Welcome to the Forums !

 

[Ululuru]

Thanks.

In the video from NASA's site, there were 15fps.

I guess you're right, the shown video is just not good enough for such calculations.

 

[Rtyh-12]

First of all, to the forums!

Second, I think that people went to the moon too.

Third, in case it helps you, the videos from the moon are not at 24 frames per second as modern ones. I am not sure, but I think it was 10 fps. EDIT: Ninja'd (although you didn't say the same)

Fourth, the things fall much slower than on Earth. It's very cool!

And fifth, that video is truly amazing. Thanks for pointing it out!

 

[bujin]

I had a discussion with a Hoaxer about this video, and he said they've probably made the feather heavier.

Made the feather heavier? What utter nonsense! This hoaxer has no idea what he's talking about.

The hammer is obviously made of polystyrene.

:thumbup:

 

[Unstung]

There is no air resistance so both objects will hit the ground at the same time because gravity acts the same on all objects.
.5gt^2 as you said without air resistance, no mass involved. I also got 1.152.
http://nssdc.gsfc.nasa.gov/planetary/lunar/apollo_15_feather_drop.html
NASA says the objects were dropped from 1.6m, so it's the video if anything.
EDIT: If you try 1.4 seconds and use exactly 1.633 for gravity, the answer is 1.60034. At playback in 30 FPS in Sony Vegas, I calculate 40 frames, which is 1.33 seconds. It must be a combination of the video and measurements not being exact.

 

[Notebook]

Shame they didn't have time for Galileo's Ramp Experiment:

Warning: We do not recommend dropping lead balls and other objects from high buildings and towers since this activity can be very dangerous

http://www.juliantrubin.com/bigten/galileofallingbodies.html

http://collegeofsanmateo.edu/physics/docs/physics250/lab03.pdf

Would have been wonderful to see that on the Moon.

N.