What Goes Up Redux
Here are the position graphs we created for and object dropped from the cliff
(blue) and an object thrown upward at 25 m/s (red)
Equations for each
Blue: y = 70 - 5t2
Note that when t = 0 for both, the y-value is 70.
2
Red: y = 70 + 25t - 5t
The slope of a position graph is
velocity.
Create a Velocity vs Time graph on
the same grid here for both
situations. See pg 2
Use g = -10 m/s2 for acceleration. Formulas and Data charts
Recall that SLOPE of a velocity graph is acceleration.
Dropped Rock (blue)
vf = 0 - 10t
vf = vi - gt
Thrown Rock (red)
vf = 25 - 10t
a.
Time (s)
Velocity (m/s)
Time (s)
Velocity (m/s)
0
0
0
25
1
1
2
2
3
3
4
4
5
5
6
6
7
7
b. Graph this data on page 1
c. Find the slope of these lines.
d. Identify the TIME when each has a velocity of 0 m/s