Answer to Question #150209 in Physics for Andu

Question

The aircraft with mass m = 3 t flies in a straight line with a speed of 1500 km / h. Four forces act on the plane: the force of gravity G. the lifting force N, the moving force F and the resistance force f. Calculate the lifting force N and the resistance force f, knowing that the driving force is F = 2600N.

Answer 1

According to Newton's first law, if a body moves at a constant speed or rests, all forces acting on it are in equilibrium (their sum is 0).

The lifting force is

$$F_L=mg=3000\cdot9.8=29400\text{ N}$$

since the airplane is not moving along the vertical.

The drag force is

$$F_D=F=2600\text{ N}$$

since the airplane moves along the horizontal at a constant rate.