Answer The essence of your question is very complicated and concerns fluid mechanics but I will simplify it as much as possible. In short, the force that opposes lift is weight (the gravitational force acting on an object's mass). If lift is greater than weight leaving all other variables such as air resistance are left the same the object is ascend. If weight is greater than lift the object will descend if already in the air or never take off if still on the ground. This question is at the heart of why planes fly. The leading edge of the wing causes the air on top to travel than the air on the bottom. Bernoulli's principle says as the speed of a fluid increases the pressure of the fluid decreases. As a result, the air on top of the wing has a lower pressure than the air on the bottom. Fluid go from high to low pressure. The air on the bottom of the wing exerts a force upward and thus the plane rises. It is important to know the other two force crucial in the flying of plane. They are thrust and drag. Thrust is the reactionary force to the force that push air out of a jet engine or from propellers. Drag is the force of air resistance and it is proportional to the velocity of the object. In other words, as the object goes faster the force trying to slow it down increases as well. This continues until the object reaches terminal velocity. Terminal velocity is the point at which the force acting on an object and the frictional force become equal in magnitude and opposite in direction. As a result, the net force acting on the object is zero and the object stops accelerating and falls at a constant rate from that point on.
Drag
Dont know maybe density force.
the force that opposes the motion of two touching surfaces is velocity.
It's because you can't create a force with your muscles that exceeds the forces of gravity attracting the box and the Earth toward each other.
The force of gravity opposes acceleration away from the source of the gravity. This is expressed as "centrifugal force" or the perpendicular component of a tangential velocity. The balance between these keeps the planets in orbit around the Sun.
Force of friction
Compressible fluid force opposes lift. Lift is the upward force due to the fluid flow around an airplane wing. Weight is a downward force caused by gravity which opposes lift.
Lift is the upward force that opposes the force of gravity.
Drag
Such force is called viscosity..the force produces in liquid and opposes the motion of fluid and also the motion of the objects in fluid..it is also called the internal friction..
The force that opposed motion through a fluid is drag.
It is known as viscous drag
Yes
This is true
Buoyant force is defined as the upward force exerted by a liquid, gas or other fluid, that opposes the weight of an immersed object. According to Archimedes' principle, the buoyant force is equal to the weight of the fluid displaced by the objects. Because all of the objects displace the fluid, buoyant force acts on all of them.
Buoyancy is an upward thrust or force exerted by a fluid , that opposes an object's weight.
upward acting force exerted by a fluid , that opposes an object's weight
A force of friction which opposes motion, particularly air or fluid resistance.