# Space arms

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#### erxhi

##### Guest
Why does the space arm have to be strong even though it operates in microgravity conditions?

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#### MeteorWayne

##### Guest
Because it is moving the same amount of mass, so it requires the same force to move things.

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#### erxhi

##### Guest
i don't understand it yet could you be more clear?

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#### Mee_n_Mac

##### Guest
erxhi":1ayf793k said:
i don't understand it yet could you be more clear?

Even though the "stuff" the arm has move is in a low gravity environment, that "stuff" still has the same mass and therefore the same inertia as it does on the Earth's surface. It's still hard to push around, it takes the same amount of force. A good example (in a 2D sense) of this is a big heavy block of iron sitting on a very slippery surface ... like wet ice. Once it gets going it'll slide nearly forever with losing speed. It's like there's no gravity to cause friction. But it takes a lot of force, a lot of hard pushing, to get it moving ... and to stop it. That's because the block has a lot of mass and therefore inertia.

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thanks

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#### erxhi

##### Guest
Mee_n_Mac":1dl4x09g said:
erxhi":1dl4x09g said:
i don't understand it yet could you be more clear?

Even though the "stuff" the arm has move is in a low gravity environment, that "stuff" still has the same mass and therefore the same inertia as it does on the Earth's surface. It's still hard to push around, it takes the same amount of force. A good example (in a 2D sense) of this is a big heavy block of iron sitting on a very slippery surface ... like wet ice. Once it gets going it'll slide nearly forever with losing speed. It's like there's no gravity to cause friction. But it takes a lot of force, a lot of hard pushing, to get it moving ... and to stop it. That's because the block has a lot of mass and therefore inertia.
would it be the same for a floating object too?like things usually do in space?

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#### MeteorWayne

##### Guest
Yes. An objects mass is not effected by whether it is floating or not. It still takes the same amount of force to move it.

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#### ZenGalacticore

##### Guest
MeteorWayne":2qv048rt said:
Yes. An objects mass is not effected by whether it is floating or not. It still takes the same amount of force to move it.

So does it take the same amount of force for me to jump two or three feet off the surface of the Earth as it does for me to jump two or three feet off the surface of the Moon?

Don't get all hoity-toity with me Wayne. I'm just asking.

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#### MeteorWayne

##### Guest
No it wouldn't But it would take the same amount of force to move your body from one place in space to another in space as it would sideways on the surface of the earth or the moon.

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#### Mee_n_Mac

##### Guest
ZenGalacticore":3sn04jec said:
MeteorWayne":3sn04jec said:
Yes. An objects mass is not effected by whether it is floating or not. It still takes the same amount of force to move it.

So does it take the same amount of force for me to jump two or three feet off the surface of the Earth as it does for me to jump two or three feet off the surface of the Moon?

Don't get all hoity-toity with me Wayne. I'm just asking.

No because in jumping you're fighting not just inertia but the local gravity feild.

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