Physics Challenge Question 2: Displacement and velocity



Physics Challenge Question 3: Velocity and acceleration

Due in class 9/29/2008

Hint for the following:

Just like velocity tells us how position changes with time (slope of an x-t graph), acceleration tells us how velocity changes with time.

The graphs below show the velocities (v) of two different people running, as a function of time (t). You will need no calculations for the questions below, only the graphs. But, be sure to show your work!

Part 1: (answer for both graphs)

During which intervals of time is the acceleration positive? Negative?

Part 2: (answer for both graphs)

Is the acceleration ever 0? If so, when?

Part 3:

Which person runs farther during the first 10 seconds?

(Hint: what are the units of [pic])

-----------------------

t (s)

t (s)

v (m/s)

v (m/s)

1

2

3

4

5

6

7

8

9

9

8

7

6

5

4

3

2

1

10

10

1

2

3

4

5

1

2

3

4

5

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