1. Homework Quiz #4 What about objects moving vertically…with or against gravity?

2. Ball Toss
Sketch the distance-time graph and velocity-time graph for a ball that is tossed straight up in the air
Graph from when the ball is released until it is caught

3. Ball Toss Analysis

4. Help students interpret graphs…
Help students interpret graphs….parabola means same motion up and down as well as same time. Slope at peak would be zero so zero velocity at max height…zero velocity also shown on bottom graph and that the magnitude of g is constant since one slope.

5. Assuming no errors, what should the slope of the velocity/time graph be?

6. What would be the readings on a speedometer and odometer attached to the cliff diver after 1 second, 2 seconds, 3 seconds of fall?

7. Speedometer After 1 second of fall: vf = vi + at +10 m/s
Known: vi = 0 and g = 10 m/s2 and time…
After 1 second of fall:
vf = vi + at
vf = m/s2 (1 s) = 10 m/s
After 2 seconds of fall:
vf = m/s2 (2 s) = 20 m/s
After 3 seconds of fall:
vf = m/s2 (3 s) = 30 m/s
+10 m/s

8. Odometer After 1 second of fall: d = vit + ½ at2
Known: vi = 0 and g = 10 m/s2 and time…
After 1 second of fall:
d = vit + ½ at2
d = 0 + ½ (10 m/s2)(1s)2
d = 5 m
After 2 seconds of fall:
d = 0 + ½ (10 m/s2)(2 s)2
d = 20 m
After 3 seconds of fall:
d = 0 + ½ (10 m/s2)(3 s)2
d = 45 m

9. Which of the following statements is true about the diver’s velocity as he falls?
His velocity is constant
His velocity increases by the same amount each second
His velocity increases by increasing amounts each second

10. Which of the following statements is true about the distance covered by the diver as he falls?
The distance is constant for each second of fall.
The distance increases by the same amount each second
The distance increases by increasing amounts each second

11. The Ultimate Freefall Joe Kittinger August 16, 1960
(video -
Joe Kittinger
August 16, 1960
Jumped from 102,800 ft
Fall lasted four minutes and thirty-six seconds, a record.
Parachute opened at 17,500 ft
Achieved maximum speed of 614 mph

12. Felix Baumgartner New Free fall record 128,000ft
Broke the sound barrier with only his body