Acceleration Free Fall Free Fall Time Speed ms
- Slides: 8
Acceleration Free Fall
Free Fall Time Speed (m/s) 0 s 0 Gain of 9. 8 m/s 1 s 9. 8 Gain of 9. 8 m/s 2 s 19. 6 Gain of 9. 8 m/s 3 s 29. 4 4 s 39. 2 Gain of 9. 8 m/s
v 1 = -9. 8 m/s a = -9. 8 m/s 2 v 0 = 0 m/s a = -9. 8 m/s 2 v 2 = -19. 6 m/s a = -9. 8 m/s 2 v 3 = -29. 4 m/s a = -9. 8 m/s 2
Kinetic Molecular Theory n Temperature n n n As temperature of a substance increases, the motion of its particles increases Remember, KE = 1/2 mv 2 Thus, as T increases the KE of the particles increases because the speeds of the particles increase
Falling in Air Time 0 s 1 s Speed (m/s) 0 9. 8 2 s 3 s 4 s 5 s 6 s 7 s 19. 6 28 35 38 40 40 Gain of 9. 8 m/s Gain of 8. 4 m/s Gain of 7 m/s Gain of 3 m/s Gain of 2 m/s Gain of 0 m/s
v 3 = 0 m/s a = -9. 8 m/s 2 v 2 = 9. 8 m/s a = -9. 8 m/s 2 v 4 = -9. 8 m/s a = -9. 8 m/s 2 v 1 = 19. 6 m/s a = -9. 8 m/s 2 v 5 = -19. 6 m/s a = -9. 8 m/s 2 v 0 = 29. 4 m/s a = -9. 8 m/s 2 v 6 = -29. 4 m/s a = -9. 8 m/s 2
A ball is kicked straight up with an initial velocity of 19. 6 m/s. n n n How long until the ball lands? What will be the ball’s final velocity? What will be the ball’s velocity at the top of its path? What will be the ball’s acceleration at the top of its path? What will be the ball’s final acceleration?
A ball is thrown from a cliff with an initial velocity of 25 m/s. . . a) straight up b) straight down In which case does the ball strike the ground with the greater speed, a, b, equal, or can’t be determined unless we know the height of the cliff?
