Question

in flight, the top skin of a metal wing is subjected to which stress?
□ tension
□ contortion
□ compression
□ shear

Explanation:

In flight, the top skin of a metal wing experiences compression. When an aircraft is in flight, the wing bends upward (lift generation), causing the top surface to be pushed together (compression), while the bottom surface is under tension. Contortion is not a standard stress type, and shear is a different stress (parallel forces), tension is for pulling (bottom skin in this case).

Answer:

compression (the option with "compression" text, i.e., the second checkbox option from the top)