1. Warm up Problem A bus travels 280 km south along a straight path with an average velocity of 24.4 m/s to the south. The bus stops for 24 min, then it travels 210 km south with an average velocity of 20.8 m/s to the south. a. How long does the total trip last? b. What is the average velocity for the total trip?

2. Physics Honors B & A – Day 9/08 & 09/09/15

3. Agenda Acceleration? velocity v. time plots Kinematic equations examples

4. What is acceleration?

5. Acceleration

6. Direction of acceleration will affect the magnitude and direction of velocity. Depending on Velocity vector, it could cause speeding up or slowing down.

7. Acceleration Direction of acceleration will affect the magnitude and direction of velocity. Depending on Velocity vector, it could cause speeding up or slowing down.

8. Acceleration Direction of acceleration will affect the magnitude and direction of velocity. Depending on Velocity vector, it could cause speeding up or slowing down.

9. Acceleration Direction of acceleration will affect the magnitude and direction of velocity. Depending on Velocity vector, it could cause speeding up or slowing down.

10. Acceleration +v and +a speed up +v and –a slow down -v and –a speed up -v and +aslow down v = 0 and + a speed up in direction of a v = 0 and –a speed up in direction of a + v and a = 0constant velocity (No change) -v and a = 0constant velocity (No change)

11. Acceleration If velocity went on the y-axis And t went on the x-axis

12. Velocity v. time plot

15. So… How would you get from a position v. time plot to acceleration v. time plot? and vice versa?

16. Determine acceleration and velocity vs. time plot from Position v. time plot

24. Determine Position v. time plot from Acceleration vs. time plot

25. What about the word problems?

26. Kinematic Equations

27. Example

28. A car accelerates uniformly from rest to a velocity of +23.7 m/s in 6.5 s. a) What was it’s acceleration? b) What was the car’s displacement?