Reffub - 1 hour ago »
Because the object in orbit is no longer continuing in a straight line, it's inertia generates a force that tries to move the satellite out towards space. When the downward force from gravity balances the outward inertial force the object is then in a stable orbit.
It seems like your describing a kind of centrifugal force, when actually it is centripetal force supplied by gravity that stops a satellite following its inertia and going off into space. Yes centripetal is another force but it is still just gravity. As I said before satellites are constantly falling back towards earth.
If I might para phrase a website..... once a satellite is launched it will fall towards the Earth with a trajectory which matches the curvature of the Earth. It will fall around the Earth, always accelerating towards it under the influence of gravity, yet never colliding into it since the Earth is constantly curving at the same rate.
As I said before you are simply trotting out the same information you have read without fundamentally understanding it. The fundamental principle on which the maths is based on is, if an object in orbit is staying at the same altitude there must be two forces in equilibrium, as you say the object is falling at the same time as it is rising. You totally ignore why this is so, even that both are exactly the same principle. Gravity is one force, the other is derived from the velocity od the moving object. it mass and the deviation from a straight line. A moving object with any mass deviated from it's path by an external force generates an opposite force, the trick here is that the two have to be exactly equal and opposite.
As you have already stated within the limits of the Earths gravitational pull that will normally adjust the altitude to compensate and hence the orbital period. Apply enough force to increase the velocity (required to change the velocity) to a level where the velocity becomes too large the object breaks free from the Earths Gravity and heads off into outer space, do it the opposite way the object descends to a level where it hits the atmosphere and falls out of orbit.
Slingshotting a space vehicle to the outer limits of the Solar System utilises this in a big way. By subtly adjusting the object track you can gain a massive increase in velocity by utilising the gravity pull of the planets (Incidentally Gravity is the weakest known force in the Universe). The principles that Newton developed in the fundamental laws of motion are way stronger.
Why do you think the bottle falls over, according to you the only force is gravity which is pulling straight down on the bottle ? Turning the car wheels to turn left or right generates a force because the bottle no longer travels in a straight line (just like the satellite) that cause the bottle to fall over. Where did this come from ?
If it wasn't for friction and air resistance an object on the ground on a flat surface would behave the same way. Introducing a gradient has the same effect of deviation from a straight line.
Imagine an object in deep space travelling at a specific velocity in a straight line and you produce thrust from a rocket thruster directly opposite to the direction it's travelling in. There is only one force directly applied, does it stop dead or even reverse, of course it does not. According to your weird ideas it should. Why not ?
| Sun 5 Feb 2017 20:12:21
#14 |
