Jack by the hedge
Safely Ignored
- Joined
- Oct 14, 2009
- Messages
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Obvs no random variables that could affect the fixed variables, which would be including correcting for the Moon's gravity being one-sixth of that of earth, like-for-like vehicle, like-for-like-weight, direction, speed and velocity. A random variable could be the weather or temperature, which could possibly change our expectation of the end result. For example, you could test acceleration due to gravity in the fall of an object, e.g., particles of dust and pebbles thrown up by the wheels of a buggy, by testing on earth in a lab with say, an AC vibrator and tickertape for the accceleration due to gravity and then observe the various forces that cause such dust to linger in the air behind observed said vehicle. On Earth, this would be wind that causes the 'rooster tail' effect, rather than the detritus falling in a parabolic wave. But there is no wind on the Moon. On the Moon, the lack of wind is a fixed variable and we should never see a 'rooster tail' effect, regardless of weather, temperature or other random variables such as weight or type of dust. The fact we DO see a 'rooster-tail' effect on the Apollo buggy shots of the dust whipped up behind it, indicates it was filmed on Earth, not on the Moon.
You appear to be confused about what a 'rooster tail' describes. It literally does mean a spray of debris following parabolic paths rather than fine dust becoming suspended in air. You also appear to be confused about what the film shows, as it certainly does not show clouds of suspended dust.

