A jet plane is speeding down the runway during takeoff. air resistance is not negligible, friction is negligible.

Assuming that you wanted to find out the forces on the jet, it would be:

- Gravitational forces (which pull the plane downwards)

- Drag forces (wind resistance and other friction forces)

- Thrust (acceleration that created by the engine)

- normal force (the runway is pushing up on the wheels)

- Lift Force (From the wings of the plane)