The document discusses free fall and concepts related to an object falling due to gravity, including: - An object in free fall experiences constant acceleration of 10 m/s2 due to gravity. - The speed of a falling object increases linearly with time according to the equation speed = acceleration x time. - Examples calculate the speed of an apple after 4.5 seconds, 8 seconds, and 15 seconds of falling to be 45 m/s, 80 m/s, and 150 m/s respectively. - Distance fallen increases with the square of the time according to the equation distance = 1/2 x acceleration x time2.

1. Physics L3 www.slideshare.net/DMS_physics

3. How Fast ? 10t t . . . . 50 5 40 4 30 3 20 2 10 1 0 0 Instantaneous Speed (m/s) Elapsed Time (s)

4. How Fast ?

9. t = 3s, v = 0m/s t = 2s t = 1s t = 0s t = 4s t = 5s t= 6s t = 7s v = 20m/s v = 10m/s v = 30m/s v = 40m/s

10. t = 3s, v = 0m/s t = 2s t = 1s t = 0s t = 4s t = 5s t= 6s t = 7s v = 20m/s v = 10m/s v = 30m/s v = 40m/s

12. How far ?

13. How far ? 5t 2 t . . . . 125 5 80 4 45 3 20 2 5 1 0 0 Distance (m) Elapsed Time (s)

17. End L3 www.slideshare.net/DMS_physics