Does it take the same energy to move the limbs in space as on earth?? If I wave my hand would it be faster than here?.

Even though you may weigh much less in space than on Earth, you still have the same mass. The law of inertia still applies and therefore, you would be exerting nearly the same energy to move your limbs. No, you would not be waving your hand faster, either.

Pro tip: Don't do kettlebells in space. Lifting and swinging rely on gravity for control. If you snatch lift a kettlebell in space, it will take a lot of energy to get it moving, but once you get it going, it will try to pull your arm off of your body when you reach peak extension.

Fitness: It's not for the faint of heart.

No air resistance in space – if you’re outside your spaceship.

so how come all the movies of the crew doing repairs outside show them moving like they're in jello??

I think it would take less energy because you don't have to pick your arm up or hold it up against gravity.

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Originally posted by roarindan:
so how come all the movies of the crew doing repairs outside show them moving like they're in jello??

They're moving deliberately because, as the second and third Newton's laws state, any force applied in one direction must be countered by an equal force in the opposite direction, and that force applies equally to any body affected by that motion.

So if an astronaut is doing an EVA, he or she must move deliberately and slowly in order to easily counteract the force of their own mass as well as the mass of their tools and suits wanting to push them in the opposite direction.

Also, if someone were to move at speed, the force required to stop them would be equal to their mass. If you wanted to get from one side of the room to the other, you would push off in the direction you wanted to travel, but in order to stop you'd have to exert the same effort or have that same force applied to you by an object in order to stop. So if you were moving at normal walking speed, you'd be hitting the wall at walking speed.

quote:

Originally posted by roarindan:
so how come all the movies of the crew doing repairs outside show them moving like they're in jello??

For the same reason* Wile E. Coyote hangs in the air when he steps off a cliff, instead of beginning to fall immediately.

* Motion picture directors do not know physics.

quote:

Originally posted by joel9507:

quote:

Originally posted by roarindan:
so how come all the movies of the crew doing repairs outside show them moving like they're in jello??

For the same reason* Wile E. Coyote hangs in the air when he steps off a cliff, instead of beginning to fall immediately.

I had always assumed it was the jangly music that held him in mid-air.

quote:

Originally posted by jhe888:
I think it would take less energy because you don't have to pick your arm up or hold it up against gravity.

The gravity thing nets out though. Picking up your arm up against gravity means that gravity is assisting when you put your arm down.

You would definitely need to re zero your scope.

quote:

Originally posted by Orguss:
Even though you may weigh much less in space than on Earth, you still have the same mass. The law of inertia still applies and therefore, you would be exerting nearly the same energy to move your limbs. No, you would not be waving your hand faster, either.

Except you're forgetting that on earth, the force you're exerting to move your limbs has to overcome the force of gravity. So while your mass remains the same, there's less force counteracting your force so you exert less force to move the same amount of mass for a given acceleration.

Also, in space, there is less air resistance. I think they hit a golf ball on the moon to prove this point.

. . . . . . . Ok ,
I'll bite
Who the hell are you waving at ?

quote:

Originally posted by bendable:
. . . . . . . Ok ,
I'll bite
Who the hell are you waving at ?

E.T.

What's the hi/lo on timing for the 1st space porn after commercial travel starts?

Mile High Club? Hold my beer................

My first thought was light waves and that it was going to report someone had figured out how to weigh photons so they wouldn’t be weightless anymore.

I guess that would leave sound waves?

Also - think of it in these terms:

If you extend your arm out and move it right-to-left, you are also compensating for gravity trying to pull your arm down.

In space, you don't need to perform that calculation and exert that effort.

Now, go into space and try to unlearn 30, 40, 50 years of experience in how to move your body.

You're going to move a little slower and a little more deliberately because the lack of gravity changes how you perform what was simple and unconscious calculations and muscle control.

Raising your arm up to rub your eye will take less effort. Therefore the learned effort will likely make you poke yourself in the eye.

quote:

Originally posted by Shaql:
In space, you don't need to perform that calculation and exert that effort.

Now, go into space and try to unlearn 30, 40, 50 years of experience in how to move your body.

You're going to move a little slower and a little more deliberately because the lack of gravity changes how you perform what was simple and unconscious calculations and muscle control.

Raising your arm up to rub your eye will take less effort. Therefore the learned effort will likely make you poke yourself in the eye.

Which is why astronauts train extensively underwater, and in simulated weightlessness during freefall flights. The buoyancy of water mimics the weightlessness of space, although it then introduces the extra water resistance, so it's not a perfect substitute. Thus the introduction of the Vomit Comet and its simulated weightlessness through parabolic flight...