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1) 2) 3) what is the basic difference between the uphill and downhill parts of t

ID: 1326341 • Letter: 1

Question

1)

2)

3) what is the basic difference between the uphill and downhill parts of the velocity graph? What is the value of the velocity that separates the uphill part of the motion from the downhill part of the motion?

4) what are the basic differences between the uphill and downhill parts of the position graph ? How do the different signs of the velocity during the two parts manifest themselves in the changing slope of the position graph? At the time when the velocity graph passes through zero, what is happening to the position graph?

5) a) when the acceleration has the same sign as the velocity , what happens to the speed of the object?

b) when the acceleration has the opposite sign as the velocity , what happens to the speed of the object?

6) is the acceleration zero when the velocity is zero at the turn- around point? Should it be? Is the velocity changing at that point?

7) are the 3 different ways of calculating acceleration for speeding up and changing directions consistent? If not, discuss possible sources for the discrepancy, or is there any reason to prefer one method over the others?

8) discuss what conclusions you can deaw about the relationships among position, velocity, and acceleration. Both qualitatively from graphs and quantitatively from your computations.( for example describe shapes of graphs,slopes of graphs. Areas under the curves).

Relationships Name Section Date I. The following is a description of the motion of a child. Carefully draw position and velocity graphs for her motion in Fig. 3,6. Make sure you put appropriate numbers on the axes. (You might find it easier to draw the velocity graph first.) (a) She starts at the origin and moves away (in the positive direction) at a constant velocity of 2.0 m/s for (b) For the next 5 s she stands in place. (e) For the next 5 s she walks away from the origin at 0.5 m/s (d) For the last 5 s she runs back toward the origin at 2.0 m/s 5 s. Time (s) Time (s) Figure 3.6: The motion of a child. 49

Explanation / Answer

2) a) train B, e)train B 1)draw the graph by using slope concept.if slope is zero velocity is also zero

b) train B f) train A

c)train A g)train B

d)train A f)train A

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