Reading Speed, Velocity, and graphs

Two runners traveling along the same straight path start and end their run at the same time. At the halfway mark, they have different instantaneous velocities. Is it possible for their average velocities for the entire trip to be the same?

• 1. Yes, because average velocity depends on the net or total displacement.

• 1. Yes, because average velocity depends on the total distance traveled.

• 1. No, because the velocities of both runners must remain exactly the same throughout the journey.

• 1. No, because the instantaneous velocities of the runners must remain the same at the midpoint but can vary at other points.

Is it possible for average velocity to be negative?

• 1. Yes, if net displacement is negative.

• 1. Yes, if the object’s direction changes during motion.

• 1. No, because average velocity describes only the magnitude and not the direction of motion.

• 1. No, because average velocity only describes the magnitude in the positive direction of motion.

Which of the following information about motion can be determined by looking at a position vs. time graph that is a straight line?

• 1. frame of reference

• 1. average acceleration

• 1. velocity

• 1. direction of force applied

True or False: The position vs time graph of an object that is speeding up is a straight line.

• True

• False

What information could you obtain by looking at a velocity vs. time graph?

• 1. acceleration

• direction of motion

• reference frame of the motion

• shortest path

How would you use a position vs. time graph to construct a velocity vs. time graph and vice versa?

• 1. The slope of a position vs. time curve is used to construct a velocity vs. time curve, and the slope of a velocity vs. time curve is used to construct a position vs. time curve.

• 1. The slope of a position vs. time curve is used to construct a velocity vs. time curve, and the area of a velocity vs. time curve is used to construct a position vs. time curve.

• 1. The area of a position vs. time curve is used to construct a velocity vs. time curve, and the slope of a velocity vs. time curve is used to construct a position vs. time curve.

• 1. The area of a position vs. time curve is used to construct a velocity vs. time curve, and the area of a velocity vs. time curve is used to construct a position vs. time curve.