Position vs. Time
animation of a red car moving to the right, hitting a wall and then moving
backward to the left is shown. Also shown is one of four possible graphs
depicting the car’s position as a function of time. The middle panel shows a
cursor on a position vs. time graph. This graph is initially blank until the
user moves the cursor.
a graph of position vs. time for the car.
Reference: See Giancoli-PA: 2-8, Giancoli-SE: 2-1.
Answer: The figure shows a crudely sketched answer drawn by dragging the
cursor in the middle panel. Since this is a problem designed for inside the
classroom instruction, the instructor can use the middle panel in many different
ways. Given Animation 1, the instructor can either show the remaining graphs or
solicit a volunteer from the class to use the cursor in the middle panel to
“draw” the correct position vs. time graph. Once this is completed, the
instructor can interact with the class to determine whether the volunteer has
drawn the correct curve. Another possible use for the middle panel is to have
students draw the velocity vs. time graph when the correct position vs. time
graph is shown. This allows students to see an animation and to see the correct
graphical representation of that motion.
Script Authors: Mario Belloni and Wolfgang Christian