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Gravity is strong enough to keep the atmosphere from being sucked up into the vacuum of space, even though it gets weaker by the distance, yet a vacuum sucks up air and can be strong enough to lift heavy solid objects, overcoming the force of gravity, just above the surface, where gravity is supposed to be the strongest.
The hypothetical force of gravity pulls every object no matter what the mass or density (neglecting air resistance) toward the Earth with enough force to have it accelerate 9.81 m/s2 All matter is being pulled down by gravity with the same RELATIVE force regardless of its density. So what's the difference between a balloon filled with air and a balloon filled with helium, of the same volume? Why doesn't the pressure gradiant cause a buoyant force to make the balloon filled with air go up, when it does so for the helium balloon? Gravity doesn't care, it is supposed to be pulling down on both with the same net force.
originally posted by: Bedlam
Here's a fun thought problem in buoyant force. You're on a passenger jet. Sitting on the runway, you release a helium balloon. The jet gets clearance and hauls down the runway.
1) does nothing different
2) shoots forward
3) shoots to the rear
Drop it, how?
Whats the one purpose?
originally posted by: BakedCrusader
a reply to: Bedlam
A balloon rises because the hot air in it is less dense than the air surrounding it. How does a hypothetical force that has never been proven and is said to pull matter down to the center of the Earth, have anything to do with this.
Buoyancy and density are proven concepts and are all that is needed. Your "gravity" only serves one purpose.
Presenting that the earth is at the center of the universe is easy enough.
originally posted by: Kashai
a reply to: greenreflections
Are you also presenting that the Earth is at the center of the Universe??
To you is the Earth Flat??