Question

How does the direction of the lift on a plane compare with its weight as it flies at a constant speed and altitude? A. Lift acts downward, and weight acts upward. B. Both lift and weight act downward. C. Both lift and weight act upward. D. Lift acts upward, and weight acts downward.

Answer 1

D.) lift acts upward from the displacement caused by the plane´s motion with the fan, weight acts downward because of gravity.

Answer 2

Option (D) is correct.

Step-by-step explanation:

The plane is moving with constant velocity. It means the acceleration of the plane is zero.

It implies that net force on the plane is zero.

Net force is zero only if, the magnitude of lift and weight are equal but both are in opposite direction.

Weight is always acting downwards so lift should be in upward direction.

Weight (downward) = Lift (upward)