Yes, gravity is lower the further one is away from the centre of the Earth, so it is lower at the top of a hill than the bottom.
Yes, in an inclined plane, the force has both a component parallel to the incline (the gravitational force) and a component perpendicular to the incline (the normal force). The normal force always acts perpendicular to the surface, while the gravitational force acts parallel to the incline.
When a plane is flying, lift and weight must be balanced to keep the plane level and maintain altitude. Lift is generated by the wings and opposes the force of weight, which is the gravitational force acting on the plane.
The force that acts on an object at a distance is called a non-contact force, such as electromagnetic force or gravitational force. These forces can act on objects without them physically touching.
As the height of the incline plane is reduced, the gravitational force acting on the object decreases. This, in turn, reduces the component of the force acting parallel to the incline, resulting in a lower force required to move the object up the incline.
Anything that pulls an object up will cancel the gravitational force. If you go into space, gravity is negligable. You could also do the experiment in a plane which is free-fall dropping.
Exactly the same. The reduction in gravitational force has no effect on M.A., which is a matter of simple geometry.
Assuming you are asking about an object that is placed on an inclined plane and the only forces acting on it are gravity and friction; as the slope of the plane increases, more of gravitational force is applied down the plane and less of the frictional force is applied to the object up the plane. Unless there is no frictional force, until the plane reaches a certain critical slope the gravitational force will not overcome the frictional force and the object will not move, and the average speed for the object will be zero regardless of the slope of the plane (below this critical slope). As the slope increases there is an increase in the net force on the object down the plane which results in a higher acceleration down the plane, and with a higher acceleration it will reach a higher speed and so the average speed of the object down the plane will be higher. So, yes, it can be said that the average speed of an object down an inclined plane is dependant on the slope of the plane. If there are other forces involved, for example a motor, then the average speed will depend on these forces as well as the slope.
Nothing happens appearance wise as the forces are equal
A plane in the air posseses gravitational potential energy or stored energy. If the pilot shuts the engine off the plane releases that energy.
Not enough information. That would depend on the angle of inclination, the coefficient of friction, and whether you are pushing it up or down the plane. Also on gravity, but that can be assumed to be more or less constant, at about 9.8 N/kg.
The forward force from a plane's engine is thrust.
The forces acting on a block on an inclined plane are the gravitational force pulling the block downhill (parallel to the incline) and the normal force perpendicular to the surface of the incline. Additionally, there may be frictional forces acting on the block depending on the surface of the incline.