The answer is refraction. When a wave from one medium enters another medium, its direction changes due to the change of speed (phase velocity changes but frequency remains the same). The wave slows down when it enters a denser medium from the one it came from hence its path seems to bend.
The 2nd has the most porosity
Infiltration
That's all I can answer for you. Hope it helps
And you asking how many meters can he run in 100 sec
Nah homieeeeeeeeeeeeeeeeeeeee
It is False because static friction is the force when a body is not on motion but in contact