Friction is a (1) that (2)
motion. It acts in a direction (3)
to the motion of
the object. There is (4)
exerted on an object that
moves on a (5)
than on a (6)
Friction opposes the motion of an object as it moves across a
surface. An object slows down (7)
on a rough
surface than on a smooth surface.​

Emmy kicks a soccer ball up at an angle of 45° over a level field. she watches the ball's trajectory and notices that it lands, two seconds after being kicked, about 20 m away to the north. assume that air resistance is negligible, and plot the horizontal and vertical components of the ball's velocity as a function of time. consider only the time that the ball is in the air, after being kicked but before landing. take "north" and "up" as the positive ‑ and ‑directions, respectively, and use ≈10 m/s2 for the downward acceleration due to gravity.