This airplane has a mass of 100,000kg and a weight of 1,000,000N. The thrust of its engines is 1000N forward while air friction drags it back with a force of 900N. The airplanes wings are generating an upward lift force of 800,000N. Find the components of the total force on the airplane.

The forces on the airplane are the force of gravity, W, the lift force L, the thrust T of its engines, and the drag D of air friction.

The weight has components: W = 0, W = - 1,000,000N
The lift force has components: L = 0, L = +800,000N.
The thrust has components: T = 1000N, T = 0
The drag has components: D = - 900N, D = 0

The total force on the airplane has the components:
F = W +L +T +D = 0 + 0 + 1000N - 900N = 100N
F = W+ L+ T+ D
= - 1,000,000N + 800,000N + 0 + 0 = -200,000N.

Examples --- What this is an example of