Flat earth's gravitational force is caused by the planet's linear acceleration. 

Let me explain by providing examples.

Imagine picking up an apple and holding it up high.  Now release the apple.  Did you see the apple fall to the ground?  If your answer is yes, then you are wrong.  The apple didn’t fall to the ground, rather the ground raised up to the apple.  This is because flat earth’s position is space is constantly changing with linear motion or accelerated lift.  As you stand on flat earth’s surface, the planet’s changing position in space is constantly changing your position in space, similar to that of an elevator.  You do not see this change because your position relative to the planet’s position remains constant.  By releasing the apple, the apple remains motionless in space until the planet lifts to meet the apple.  Once the apple is collected by the ground, the apple’s position in space changes relative to the planet’s linear motion. 

Image you are in a grounded airplane with a parachute pack on your back.  The airplane’s lifts from the ground at an accelerated rate greater than the planet’s linear acceleration rate in order for the airplane to reach a safe jumping altitude.  Once you jump from the airplane, the plane’s position in space continues to lift with the planet’s changing position, so the plane’s altitude remains constant above the rising planetary surface, while your position in space remains nearly unchanged.  The term “free falling” is actually an inaccurate term because skydivers aren’t actually falling through the atmosphere.  Actually, flat earth’s linear motion is pushing the atmosphere past the skydiver.  The skydiver’s body can change to increase or decrease drag as the atmosphere moves past the skydiver.  Once the skydiver lands, the planet’s changing position is space forces the grounded skydiver’s position is space to begin changing at the same rate. 

Imagine picking up a coat from the ground and holding it at eye level.  Do you see the coat dangling toward the ground?  What you are really seeing is the coat being pulled through space which is controlled by the coat’s connection with your hand.  As you're standing on flat earth’s surface and flat earth is accelerating along a linear path through space, you too are accelerating through space.  As your position in space changes, the coat’s position in space also changes.  If you drop the coat, the rising planet will collect the coat, so both the planet and coat rise together through space at the same rate.  This concept of the coat is similar to an airplane pulling an advertisement banner behind it.  The airplane’s lifting motion and parallel movement above flat earth and through the atmosphere stretches out the banner behind it, but if the airplane were to reduce lift and land, then the banner is no longer being lifted and pulled by the airplane.  Instead, the grounded banner’s position in space is changing relative to the planet’s linear change through space.  This means the coat stretches out in the direction opposite the planet’s linear motion. 

Imagine you’re at a baseball game.  A batter steps up to the plate and the pitcher throws the ball.  Once the bat comes in contact with the baseball, the baseball changes direction.  The batter hits the baseball toward center field.    From your seat, you see the baseball fly up into the air and then fall back to the ground because of the planet's linear motion, but that’s not really what’s happening.  What did happen?  The baseball only traveled in one direction and didn’t actually curve back toward the ground.  It is your linear change in position relative to the planet’s linear change in position that gives the appearance of the ball rising and falling.  At first, the baseball’s lift rate from the bat is greater than the lift rate of the planet.  This sends the baseball high into the air along a linear trajectory toward the center field.  Without constant propulsion, the baseball’s lift rate begins to decline against the air that exists along its path.  Eventually, the lift rate of the baseball and the planet become equalized.  This is where the baseball appears to peak before falling back toward the ground.  The baseball never actually falls back to the ground, the baseball continues along its linear trajectory as the rate of motion continues to reduce.  It’s the constant lift rate of the planet that raises up to the baseball which is slowing down.  It’s the baseball’s declining acceleration relative to the planet’s constant lift that gives the appearance of the baseball falling to the ground. 


A balloon filled with helium over comes flat earth’s gravitational force because helium’s atomic weight (3) is less than atomic weight of oxygen (16) and nitrogen (14).  This means that the helium filled balloon is force up to a higher altitude that matches the balloon’s total weight relative to the surrounding atmospheric elements.  This concept can also be applied to air bubbles that pass up through water in a fish tank.  The atomic weight of H2O (18) is greater than oxygen (16), this forces the oxygen air bubble up through the water.  Now apply this concept to rain drops, the atomic weight of H2O (18) is greater than oxygen (16), this forces the planet’s atmosphere to move past the H2O molecule until the rain drop is collected by the ground.  It’s believed that rain falls from the sky, but that is incorrect.  Rain drops are formed, then their atomic weight determines their position in the atmosphere.  The planet’s solid surface then collects the rain drop.  When many drops of rain are collected, they form a puddle.  Sea level is also determined by flat earth’s linear acceleration.  The planet’s constant linear change in space levels out puddled water and oxygen relative to motion and atomic weight or density. 
 
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In order to better understand how flat earth operates as a habitable planet, already known scientific concepts in physics need to be applied in a new way.  Earth as a flat planet can’t necessarily use the same definitions applied to the global heliocentric model because the shape of both models are completely different.  Michael Stevens proved this in his anti-flat earth V-sauce episode.  He applied the global definition of gravity, which is currently defined as a “force that pulls matter to the center of the planet” to a flat earth model.  What Michael proved is how the definition of gravity isn’t a universal definition.  If the concept of earth being flat is to be taken seriously by the scientific community, then a scientific model of flat earth needs to be created with new definitions.  All definitions that are used to define how earth’s global model works may need to be redefined.  Redefining gravity as a “linear acceleration force that pushes matter through space” is a better definition that works with the concept of flat earth.  The next time a globalist asks you how gravity works with flat earth, describe gravity as linear acceleration caused by planetary propulsion called "gravitational propulsion.  Remember, the idea that flat earth is a motionless object in wrong.  Flat earth isn’t orbing around the sun, but it is moving.  Flat earth is traveling along a linear path through space.  As a final note regarding gravity, Michael Steven’s anti-flat earth V-sauce episode did offer some words of wisdom.  He claimed that some flat earthers believe that earth has a lift rate of 9.72 meters per second.  If the global model is wrong, then a superior flat earth story needs to be devised.