Reffub - 6 minutes ago »
Velocity creates a force, why does a satellite change it's altitude when you speed it up, without there being a force created in a upwards direction ? It stops gaining altitude when gravity regains equlibrium.
You're firing thrusters to speed it up change velocity, that is a force, of course it is going to change altitude, fire the forward thrusters and it will descend into a faster orbit. But with normal use and no thrusters gravity is the only force.
Why does the bottle fall over when you go round a corner ? Why would a plumb bob suspended in a moving vehicle deviate from vertical when the car goes round a corner at a constant speed ?
Because the bottle & plumb bob want to carry on travelling in a straight line. But then cars general don't orbit the Earth, if they did there would be an equal gravitational force on the car and its contents including the bottle and your plumb bob.
A train crossing the Nullarbor desert travels in a straight line for around 300Mls. The world land speed vehicle travels in a straight line, there's no way it could go round a corner at around 1000mph. A object in space will travel in a straight line until it gets affected by gravity or some sort of reaction thruster is fired.
Well done we are finally getting there, I've always said gravity and gravity alone is the only force.
Regarding Newton's first law of motion, "a body in motion at a constant velocity will remain in motion in a straight line unless acted upon by an outside force."
What's the problem the satellite is being acted upon by an outside source, it is called gravity so it won't be traveling in a straight line.
Gravity is pulling the satellite down towards the centre of the Earth. How does the satellite stay up there if that is the only force. Talk about a daft argument. 
