- #1
Sampad Saha
- 15
- 0
In Earth due to gravity if m is greater, greater the force need to move it..but what in case of space where has no gravity ?
What is the importance of Mass in out of gravity i.e out o?
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Discussion Overview
The discussion revolves around the role and implications of mass in environments with varying gravitational influences, particularly contrasting conditions on Earth with those in space. Participants explore concepts related to inertia, gravitational forces, and the perception of weightlessness in orbiting spacecraft.
Discussion Character
- Exploratory
- Technical explanation
- Debate/contested
Main Points Raised
- Some participants question the assumption that there is no gravity in space, citing the moon's orbit as evidence of gravitational forces at play.
- One participant emphasizes that while mass affects the force needed to move an object on Earth, the dynamics change in space, particularly in the absence of friction.
- Another participant clarifies that Newton's second law applies universally, indicating that greater mass requires more force for the same acceleration, even in space.
- There is a suggestion that the perception of weightlessness in a space station may lead to misconceptions about the presence of gravity, as it acts as a centripetal force rather than a downward pull.
Areas of Agreement / Disagreement
Participants express differing views on the nature of gravity in space, with some asserting its presence and others questioning its significance. The discussion remains unresolved regarding the implications of mass and gravity in non-Earth environments.
Contextual Notes
Participants reference gravitational forces and inertia without fully resolving the implications of these concepts in different contexts, such as frictionless surfaces or orbital mechanics. There is also a lack of consensus on the interpretation of gravitational effects in space.
- #2
Vanadium 50
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What makes you think in space there is no gravity? Why does the moon stay in orbit?
- #3
- #4
Sampad Saha
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Thanks to help...it was a silly mistake of my ...dean barry said:
- #5
Sampad Saha
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...sorry ...it was a silly mistake of my ...Vanadium 50 said:
- #6
dean barry
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Glad to help, shift the mass from one to the other as you like, re-calculate the orbital data using the attached sheet.
- #7
HallsofIvy
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You seem to be confused about several things. "On Earth due to gravity", it is harder to lift an object of greater mass because of its greater weight. On the other hand, it is not necessarily harder to move it horizontally. If there is friction, then the friction force will be proportional to the weight so greater for a more massive object, but if there is no friction, gravity will play no part.Sampad Saha said:
Either on a frictionless surface or in space, far from any massive object, so that gravitational force is negligible (not 0), we still have inertia, Force is still "mass time acceleration" so a greater force is needed to start (or stop) the motion of a massive object- but not to keep it moving.
- #8
Delta2
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Newton's 2nd law F=ma or a=F/m holds everywhere so the greater the mass m is the more force F we have to put in order to achieve the same acceleration a. if we put [itex]F=F_{external}-B[/itex]and since the weight B is reduced in space due to the increased distance from Earth we can say we can put less force [itex]F_{external}[/itex] to achieve the same acceleration a, but i feel this is not what we had in our minds when we talk about this.
However what i believe we had in mind and happens inside a space station or a space shuttle in orbit around the Earth is that the gravity from Earth acts as a centripetal force rather than a pull down force. Inside a space station you just don't feel the gravitational pull from Earth though it exists, so i guess from that, one might get the delusion that gravity doesn't exist in space or that is easier to move things in space.
However what i believe we had in mind and happens inside a space station or a space shuttle in orbit around the Earth is that the gravity from Earth acts as a centripetal force rather than a pull down force. Inside a space station you just don't feel the gravitational pull from Earth though it exists, so i guess from that, one might get the delusion that gravity doesn't exist in space or that is easier to move things in space.
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