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Thread: centrifugal force from the sun

  1. #1 centrifugal force from the sun 
    Forum Sophomore schiz0yd's Avatar
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    does the earth's rotation around the sun create any centrifugal force away from that sun that can be detected?


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    You mean besides the fact that the earth does not fall into the sun?


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    Forum Senior Booms's Avatar
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    yes, we havn't died yet


    I'm not sure what you're asking, centrifugal force is the interaction between two objects, so the centrifugal force between us and the sun only has an effect on the two objects, it's not going to affect anything else (unless we hit something along the way)
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    Forum Sophomore schiz0yd's Avatar
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    does it increase or decrease the effect of gravity if you are between the earth and sun or behind the earth from the sun's perspective. something like that.
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  6. #5  
    Moderator Moderator Janus's Avatar
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    Quote Originally Posted by schiz0yd
    does it increase or decrease the effect of gravity if you are between the earth and sun or behind the earth from the sun's perspective. something like that.
    No. The centrifugal effect is due to the tendency of the Earth to travel in a straight line. The reason it circles the Sun is due to the Sun's gravity, and the Earth's gravity pulls on everything.

    Imagine you are on one of those carnival rides were it spins and you feel a force pushing you to its sides. What would happen if the sides of the ride suddenly vanished? You'd go flying off in a straight line. This is because it was the sides of the ride pushing in on you that stopped you from doing this and this is why you felt what felt like a force pushing you into them.

    Now imagine you were standing with the sun directly overhead an the Earth suddenly vanished. Would you go flying off in a straight line? No, you keep orbiting the Sun like before. Because the Sun's gravity is still there. It isn't like the ride. The Earth under your feet pushing you in towards the Sun isn't what keeps you from flying off, the Sun's pull directly on you does. Thus you feel no extra force pushing you to the ground.
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  7. #6  
    Forum Sophomore schiz0yd's Avatar
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    but doesn't my own tendency to go in a straight line affect our weight depending on where we are in relation to the earth and sun? if we have energy that want to go to do that, shouldn't it have some measurable effect? or is our planet possibly formed from matter that fell into the sun's gravity in an equilibrium state between it's entry velocity and the sun's gravitation pull, so then all the mass of the earth including myself is already acting as a system. i think i just answered my own question and now i feel dumb for not figuring it out before. unless i'm wrong.
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    Quote Originally Posted by schiz0yd
    but doesn't my own tendency to go in a straight line affect our weight depending on where we are in relation to the earth and sun? if we have energy that want to go to do that, shouldn't it have some measurable effect? or is our planet possibly formed from matter that fell into the sun's gravity in an equilibrium state between it's entry velocity and the sun's gravitation pull, so then all the mass of the earth including myself is already acting as a system. i think i just answered my own question and now i feel dumb for not figuring it out before. unless i'm wrong.
    As you orbit you are in free fall, so you feel no net force from the sun, nor do you feel anything pulling you away. All you feel is the earth's gravitational pull on you (your weight). The earth can vanish and you would still keep on orbiting as Janus said, but if the sun vanished you would continue in a straight line.
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  9. #8  
    Forum Sophomore schiz0yd's Avatar
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    what about centrifugal force from the earth's rotation while on the equator vs being on the poles?
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  10. #9 Detecting the centrifugal force caused by Earth's orbit. 
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    The slight difference in distance to the Sun (r) in our Earthly positions at midnight and noon affects the forces on our bodies in two slightly different ways. Gravitational force = Mm/r≤, and centrifugal force = v≤r. I think that v would need to include the Earthís rotational speed along with its orbital speed, but Iím not exactly sure. Combining gravitational and centrifugal forces would result in extremely small differences in your "weigh" measured on a very sensitive balance.
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  11. #10  
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    Quote Originally Posted by schiz0yd
    what about centrifugal force from the earth's rotation while on the equator vs being on the poles?
    The difference in speed, relative to an inertial reference frame between locations on the equator and at the poles, or even further north or south is a significant factor in the selection of launch sites for rockets. That is why the French Ariane is launched from Koru and why the U.S. launches from Florida. It is also why launches are generally to the east. Polar launches and launches to the west require significantly greater performance from the rocket boosters.

    But the effect on your bathroom scale would be pretty small.
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  12. #11  
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    for the humour of it may I ask how small (any approximation will do)........
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  13. #12  
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    Quote Originally Posted by fatman57
    for the humour of it may I ask how small (any approximation will do)........
    About a 0.3% difference between pole and equator.
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    The heated mind resents the chill touch & relentless scrutiny of logic"-W.E. Gladstone


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