At least part of the applied force must be in the same direction as the movement of the object.
The applied force must make the object move.
Yes. Gases and liquids both exert a buoyant force.
no because buoyant means how much can an object float and weight means how much it weighs.
3000
2000
Does speed 'effect' the gravitational potential energy of an object? No, but gravitational potential energy can be converted into kinetic energy - so the gravitational potential energy can effect the speed.
Ep = mgh
Energy Potential = mass * 9.81 (gravity) * height
Speed / Velocity is absent from that equation.