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

The spheres would experience identical air resistance, 9.8 m/s/s acceleration would cause them to accelerate at the same rate, and the surface areas are identical. When the heavier object reaches terminal velocity the air resistance would be higher.  The left pedal has a LH thread because the torque acted upon it would cause the screw to tighten if anything.