2. Moving Right and Moving Left Post-Activity 1.In every case in this activity the graph of position vs. time was linear. What does that tell you about the motion of the car? 2.The slopes of the position vs. time graphs in this activity differed in steepness and in sign. a.What does the steepness of a position vs. time graph tell you about the motion of an object? Since the graph is linear the slope is constant. Therefore, the speed of the car is constant. The steepness of a position vs. time graph represents how fast the object is moving. The steeper the slope, the faster the motion. b.What does the sign of the slope of a position vs. time graph (+ or -) tell you about the motion of an object? The sign of the slope of a position vs. time graph represents the direction of motion. A positive slope indicates motion to the right while a negative slope indicates motion to the left.

3. Moving Right and Moving Left Post-Activity 3.The y-intercepts of the position vs. time graphs in this activity were sometimes different. a.What does it tell you about the motion of the car when the y-intercept is above the time axis (positive +)? A positive (+) y-intercept means the car started to the right of 0. A negative (-) y-intercept means the car started to the left of 0. b.What does it tell you about the motion of the car when the y-intercept is below the time axis (negative -)? The y-intercept of a position vs. time graph represents the starting position of the object c.Overall, what does the y-intercept of a position vs. time graph tell you about the motion of an object?

4. Moving Right and Moving Left Post-Activity 0 position Remember that the slope of a position vs. time graph isn’t only how fast the object is moving, but the slope also shows the direction of motion. Position vs. Time

5. Moving Right and Moving Left Post-Activity Vector – quantity having both a magnitude (size) and a direction. Position vs. Time *Vector quantities are denoted by placing an arrow over the variable.

6. Moving Right and Moving Left Post-Activity Vector – quantity having both a magnitude (size) and a direction. Scalar – quantity having only a magnitude (size). i.e. mass, speed, distance Position vs. Time *Vector quantities are denoted by placing an arrow over the variable.

7. Moving Right and Moving Left Post-Activity Final Position General Math Model for one-dimensional, constant velocity motion Position vs. Time

8. Moving Right and Moving Left Post-Activity General Math Model for one-dimensional, constant velocity motion Where Position vs. Time

9. Moving Right and Moving Left Post-Activity A physics teacher walks 4 m East, 2 m South, 4 m West, and finally 2 m North. Distance = ? Distance = 12 m Displacement = ? Displacement = 0 m

10. “Walking the Graph” Examples 0 AA Position vs. Time