friction (including fluid friction like air resistance) and gravity
They are inertia and momentum. If an object is in motion it tends to "try" to stay in motion, and an object at rest does the same to stay put. The forces still act on it, although the forces are slightly weaker.
I don't see how anything can "act against momentum"; momentum is always conserved. If there is friction, the movement of the object will be slowed down; but in this case, momentum is transferred to the air, or whatever is slowing down the object in question. Total momentum will be conserved.
momentum
Internal forces, such as the force of gravity on an object moving horizontally, do not cause a change in momentum. Additionally, forces that do not act in the direction of an object's motion, like perpendicular forces, do not affect the momentum of the object.
The law of conservation of momentum states that in a closed system, the total momentum before a collision is equal to the total momentum after the collision, as long as no external forces are present. This means that momentum is conserved in a system if there are no external forces acting on it.
Momentum is conserved in a collision when there are no external forces acting on the system.
The law of conservation of momentum states that the total momentum of a closed system remains constant if no external forces are present. This means that momentum is conserved before and after a collision or interaction between objects in the absence of external forces.
External forces applied to the system can change the total momentum. This includes forces from contact interactions, such as collisions, as well as non-contact forces like gravity or electromagnetic forces.
For momentum to be conserved, the system must be isolated from external forces. Additionally, there should be no internal forces causing a change in momentum within the system. Finally, momentum will be conserved in both magnitude and direction if these conditions are met.
The rudder is used to counteract the yaw forces cause by the ailerons.
For momentum to be conserved, the system must be isolated from external forces. This means that no external forces, like friction or air resistance, can act on the system. Additionally, the total momentum of the system before an interaction must be equal to the total momentum after the interaction.
Momentum is constant in a closed system when there are no external forces acting on the system.