hello everybody.

I just watched this movie for the first time,and I noticed,of course thats my problem,im not sure,anyway...I noticed that during the scene when the astronaut whose name is DAVE i guess goes out of the big or main space craft to save his friend who's thrown out by HAL.
My question is :Is the main space craft moving when the little space craft goes out or is it still(not moving)...if it's moving how can a small space craft which obviously needs to change direction go back and fix a part of the main space craft and then get back in the main space craft ...i mean it needs to accelerate right? but it doesnt have enough fuel and it isnt capable of having the same speed as the main spacecraft...or the opposite does the main space craft slows down so that the small one could catch up......

I need a good explanation.

I'd appreciate it.

bye.

Attached Images

eintonnewstein2.jpg (84.7 KB, 10 views)

The main spacecraft is moving on its way to the Jupiter system. The little pod craft come out of the bay of the main spacecraft and are at its velocity. There is no friction in space and the little pod craft are in the same frame of reference relative to the main spacecraft. Therefore, from the frame of reference of the pods, the main spacecraft is stationary. The pods can accelerate and decelerate relative to the main craft as if the main craft were still. Just as if you are a passenger on an airline and you get up to walk down the isle and back to your seat. You are only feel as if you are moving relative to the plane, not the ground 35,000 feet below.

The situation might change however if the pods moved too far away from the main craft at a right angle and then slowed down relative to it. This may not be the best explanation but I hope it helps.

__________________
"Insignificant molehill sometimes more important than conspicuous mountain." - Charlie Chan

okay,let's settle things...actually what i was asking was not about the pod that comes out and moves along the main space craft but...thanks anyway...

Actually I understood what was goin on ... and it was quite simple...my

confusion was with the small pod that was moving in a direction with angle of

90 degrees in relation to the main space craft thus the frame of reference

changes so the main space craft seems to be movin faster than the small pod

which is actually true...cause its as if the small pod is moving on Y-axis constantly and the main space craft is moving on X-axis so it's quite clear now.

But thanks a lot.

¨Everything is as clear as an unmuded lake. ¨Alex De Large (A Clockwork Orange)

I can't answer your question except by saying that after the movie was finished, Kubrick said there was only one technical error that he missed during shooting. When Heywood Floyd is sipping a drink through a straw in zero gravity, the liquid remaining in the straw runs back down into the container. In zero G, it would remain in the straw.

what I didn't understand about the film is, that the craft is supposed to be spinning to provide artificial gravity yet when the small craft goes out there is no spin, it's all very illogical.

as to the OP, all velocities are maintained(without a force upon them)in the vacuum of space and anything on the ship will be going at the save velocity as anything else on the ship and will maintain that velocity when it leaves the ship. The ship was not under acceleration, just gliding.

__________________

Not the whole craft is spinning, just a caroussel section inside. The pod garage etc is in the non-spinning part.
I don't agree with Kubrick that the only technical error must be one. When you sip something from a pack with a straw, u often leave an underpressure in the pack. So, if u stop sipping and leave the straw, the liquid inside would run back, even in zero gravity.This behaviour would even be desirable and thus enforced in a zero-gravity drink pack, I guess.

__________________
"Flying in space is risky business, but just staying on this planet is risky business too." - John Young, astronaut

Internal centrifuge.

From something on the Web claiming to be a 2001 script:

Excerpt text and diagrams at Atomic Rockets: Artificial Gravity

__________________
0 1 1 0 1 0 0 1 1 0 0 1 0 1 1 0 1 0 0 1 0 1 1 0 0 1 1 0 1 0 0 1 1 0 0 1 0 1 1 0 0 1 1 0 1 0 0 1 0 1 1 0 1 0 0 1 1 0 0 1 0 1 1 0 ...

Yes I see, but it would make far more sense if you were designing a ship like that to just make the whole think revolve and then if they had to send out the pod they could stop the spin for a while. What is the point of making a carrousel?

__________________

Apparently, you're right. The Wikipedia entry on 2001 lists about ten "minor faults in scientific accuracy", a few of them deliberate for aesthetic reasons. I don't know why Kubrick would say there was only one.

I would say the worst fault is the billowing dust on the Moon. No air, no billowing.

__________________
Everything I need to know I learned through Googling.

That's actually a direct steal from Arthur C. Clarke's novel. At least they acknowledge the source on the page.

Stopping and restarting the spin of the entire ship would be wasteful in terms of energy and propellant. And you'd have to build it to withstand the tension forces from spinning as well as the compression forces generated by the engines. And looking out the windows would drive you crazy.

Fred

__________________
"For shame, gentlemen, pack your evidence a little better against another time."
-- John Dryden, "The Vindication of The Duke of Guise" 1684

Just in case: the Atomic Rockets web site I cited isn't the same one as the unnamed one I labeled as the 2001 script site. I first found the script, perhaps as you say the actual novel, then found that excerpt from the script/novel plus diagrams at Atomic Rockets -- which indeed does credit its sources. I'll leave it up to Clarke to determine whether it is a steal.

__________________
0 1 1 0 1 0 0 1 1 0 0 1 0 1 1 0 1 0 0 1 0 1 1 0 0 1 1 0 1 0 0 1 1 0 0 1 0 1 1 0 0 1 1 0 1 0 0 1 0 1 1 0 1 0 0 1 1 0 0 1 0 1 1 0 ...

Trust me. That excerpt is from the novel.

Fred

__________________
"For shame, gentlemen, pack your evidence a little better against another time."
-- John Dryden, "The Vindication of The Duke of Guise" 1684

Moved from "Bad Astronomy Stories" to "Small Media at Large."

__________________
Everything I need to know I learned through Googling.

But what did you think of the movie?!!

__________________
Time cube is evil.

it put me to sleep

__________________
'The eye can only see what the mind is prepared to accept'

I am amazed though at how well 2001 di the space baby sequence. At the time the movie and book it was based on came out, space baby research was in its infantcy.

Similar situation to a Shuttle astronaut moving away then back again from a vehicle going 8 km/s, using only the small jets on his backpack.

__________________
"The truth may be out there, but lies are inside your head" Terry Pratchett

:groan:

__________________
At night the stars put on a show for free (Carole King)

No, you're falling prey to the same mistake you're trying to correct.

The spacecraft is, for all intents and purposes of the pod, stationary. Period.

If the pod moves far away from the mother craft - it will be far away. If it then accelerates in a direction toward the rear of the mother craft, well, it will now be moving toward the rear of the mothercraft. If it turns around and accelerates in the other direction, it will come back. With enough fuel, the pod can do rings around the mothership with free abandon.

Nothing the pod does will change the fact that the mother craft will behave as if stationary.

I'm afraid the movie didn't age well. In 1968 the book was so exciting I stayed up all night to read it. The movie was... well, it was a FIRST. Aside from Star Trek, there were very few realistic SF/space movies. And I liked the book, so... I was loyal to the movie. A lot of others who saw it were like "huh? What did it MEAN?" (they hadn't read the book.) And lots of h