# 2D Motion Quiz

1. As you commute to work or school in the morning, which is most likely to be larger?
• A. The magnitude of your displacement
• B. The distance you travel
• C. Not enough information to say
2. If you are carrying a ball and running at constant speed and wish to throw the ball so that you can catch it as it comes back down, should you
• A. throw the ball at an angle of about 45o above the horizontal and maintain the same speed?
• B. throw the ball straight in the air and slow down to catch it?
• C. throw the ball straight in the air and maintain the same speed?
3. As a projectile moves in its parabolic path, the velocity and acceleration vectors are perpendicular to each other
• A. everywhere along its path
• B. at the peak of its path
• C. nowhere along its path
• D. not enough information is given
4. A home run is hit in a baseball game.  The ball is hit from home plate into the center field stands, along a parabolic path.  What is the acceleration of the ball
• while it is rising?
• at the higher point of the trajectory?
• while it is descending after reaching the highest point?

(IGNORE AIR RESISTANCE)

Answers: b, c, b, g = 9.80 m/s2 for all situations,or 9.80 m/s2,or -9.80 m/s2

(source)