une force appliquée

En physique, la traction est une force appliquée par des moyens mécaniques solides // In physics, traction is a force applied by solid mechanical means.

Today's prompt are "tread" in English and (Suddenly!) "traction" in French. I am not even sure if  wikipedia definition in the caption is correct, but the two come together nicely when I think about tractors.

Cat seems to be happy, too. Finally a vehicle to match his powerful personality.