MP #3

# MP #3 - Print View Class PH1110A2007 Assignment 3 Due at...

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1 of 7 [ Print View ] Class PH1110A2007 Assignment 3 Due at 5:00pm on Wednesday, August 29, 2007 View Grading Details Analyzing Position versus Time Graphs: Conceptual Question Two cars travel on the parallel lanes of a two-lane road. The cars’ motions are represented by the position versus time graph shown in the figure. Answer the questions using the times from the graph indicated by letters. Part A At which of the times do the two cars pass each other? Hint A.1 Two cars passing Hint not displayed ANSWER: D Part B Are the two cars traveling in the same direction when they pass each other? ANSWER: yes no Part C At which of the lettered times, if any, does car #1 momentarily stop? Hint C.1 Determining velocity from a position versus time graph The slope on a position versus time graph is the "rise" (change in position) over the "run" (change in time). In physics, the ratio of change in position over change in time is defined as the velocity. Thus, the slope on a position versus time graph is the velocity of the object being graphed. ANSWER: none Part D At which of the lettered times, if any, does car #2 momentarily stop? Hint D.1 Determining velocity from a position versus time graph Hint not displayed

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2 of 7 ANSWER: C Part E At which of the lettered times are the cars moving with nearly identical velocity? Hint E.1 Determining Velocity from a Position versus Time Graph Hint not displayed ANSWER: A Going for a Drive Learning Goal: To gain a qualitative understanding of kinematics and how the qualitative nature of position and velocity versus time graphs relates to the equations of kinematics. In this problem, you will explore kinematics using an applet that simulates a car moving under constant acceleration. When you open the applet , you will see three sliders that allow you to adjust the initial position , the initial velocity , and the acceleration . Set the initial position to 0 , the initial velocity to and the acceleration to 5 . Run the simulation. Notice that, as the movie proceeds, pictures of the car remain at certain points. Once the simulation is over, these pictures form a motion diagram--a representation of motion consisting of pictures taken at equal time intervals during the motion. In this case, the interval between pictures is one second. Below the movie, the position of the car as a function of time is graphed in green. Run the simulation several times, paying attention to how the graph and the motion diagram/movie of the car's motion relate to each other. Part A Which of the following describe the relationship between the motion diagram/movie and the graph? When the slope of the graph is close to zero, the pictures in the motion diagram are close together. A. When the slope of the graph is steep, the car is moving quickly. B.
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