Bell Work: Projectile Motion Drawing [Don’t copy down the directions, just follow them.] Choose a projectile that is launched up at an angle. Draw the projectile in motion. Dot out the path, trajectory, that it follows. Label vx is two places with horizontal arrows. (both arrows should be the same length.) Label vy in three places with vertical arrows. (all 3 should be different lengths.) Put a star where it is moving the slowest. Put two circles on the dotted path where the speeds are equal.

As the projectile moves up, its speed ( increases / decreases ). At the top of the trajectory, the total speed is ( zero / horizontal only / vertical only ). As the projectile moves down, its speed ( increases / decreases ). The whole time its in the air, the acceleration is _____. The time up is ( different from / the same as ) the time down. The velocity going up is ( negative / positive ) and the velocity coming down is ( negative / positive ).

Today: Do projectile Practice Problems (due tomorrow at the beginning of class) 3. A. 4.29 s B. 25.7 m 4. A. 0.523 s B. 1.45 m/s Range is horizontal displacement A. 7.15 m B. 1.40 m/s 6. t = 12.6 s; x = 378 m 7. 20 m short of the target Work on vector lab Work on crossword puzzle (projectiles)