Can You Move a Spaceship By Running and Jumping In It?

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Discussion Overview

The discussion revolves around the question of whether a person inside a stationary spaceship can move the spaceship by running and jumping against its walls, exploring concepts of momentum, inertia, and the effects of gravitational curvature on motion.

Discussion Character

  • Exploratory
  • Debate/contested
  • Technical explanation

Main Points Raised

  • Some participants suggest that due to conservation of momentum, running and jumping inside the spaceship would not result in any net movement of the spaceship, as the center of mass remains unchanged.
  • Others argue that if the spaceship is in a locally curved space due to gravity, it may be possible to move both oneself and the spaceship through specific motions.
  • A participant questions the feasibility of moving the spaceship by running and jumping, emphasizing the need to overcome the spaceship's inertia first.
  • Another participant notes that in the absence of external forces, a small force could potentially result in motion, but questions the amount of force required given the spaceship's mass.
  • Concerns are raised about the effects of friction in a terrestrial environment compared to the vacuum of space, suggesting that the lack of resistive forces in space could allow for some movement.
  • One participant expresses skepticism about the claims made in an article referenced, indicating that significant effort would be required to achieve minimal movement.

Areas of Agreement / Disagreement

Participants express differing views on the feasibility of moving the spaceship by running and jumping, with no consensus reached on the effectiveness of such actions under various conditions.

Contextual Notes

Participants mention the influence of inertia and external forces, but the discussion lacks clarity on specific assumptions regarding the spaceship's environment and the nature of forces acting on it.

Pheo1986
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Hi, this is my 1st post so be gentle :smile:

Just a random question... if you was in a spaceship that was 'stationary' and you had no means of propulsion, could u run and jump into the wall to make it move forwards or would the friction with the floor from ur movement cancel out the impact on the wall due to conservation of momentum or one of Newtons laws.
 
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Every action has an equal and opposite reaction. ( Anonymous smart guy)

If you run then you have to push the spaceship in the opposite direction to propel yourself forward. When you hit the spaceship wall you lose all energy and hence all motion same applies for the ships motion and energy.

You will move the ship for a slit bit as you moved in a direction but the center of mass of you plus ship stays put.
 
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The most recent issue of Scientific American has an article on this. If the spaceship is in "flat" space, you are out of luck. But if the space the spaceship is in is (locally) curved by gravitation or has curvature due to the overall shape of space, then you can, by swimming motions, move yourself (and the spaceship).

Read the article for more details.
 
eachus said:
The most recent issue of Scientific American has an article on this. If the spaceship is in "flat" space, you are out of luck. But if the space the spaceship is in is (locally) curved by gravitation or has curvature due to the overall shape of space, then you can, by swimming motions, move yourself (and the spaceship).

Link to article please... very skeptical about articles.
 
eachus said:
But if the space the spaceship is in is (locally) curved by gravitation.
The premise is that the space is is staionary, so gravitational effects aren't allowed.
 
Every action has an equal and opposite reaction. Its not possible that you could run and jump into the walls to move the spaceship as you will first have to overcome the inertia of the spaceship.
 
however to overcome the inertia of a spaceship where there is virtually no other forces acting on it would require a very small force. if the spaceship moves through space it encounters a very small... if any resistive force therefore any force applied would be transformed into motion
 
hmm inertia is dependent on the mass of an object so why would it requier a small force when there are no other forces acting on it?
 
it is true, however if you did the same thing in an environment found on the Earth there would be no change due to frictional forces etc acting on the spaceship. in space these forces are removed. Therefore what little impact to the spaceships velocity is achievable is maximised
 

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