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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