Can you solve these physics riddles? ft Simone Giertz - Part 1/3

The force of air resistance is higher on the metal ball since it's heavier.
When both balls reach terminal velocity, they do not accelerate anymore and thus all forces cancel out. There is only gravitational force and air resistance left, so the absolute value of both forces are the same for each ball. And since the gravitational force (F_{grav} = m x g) is dependent of mass, it's higher for the metal ball.

*edit*: also independant of the surface material or shape of the objects :-)