1. QQ: Brandon’s velocity starts at 0, increases rapidly for the first few seconds, then after reaching 11 m/s remains almost constant. Find his
velocity at 1 second. At 2 seconds? At 3 seconds?

2. Today’s objective:
I can calculate average and instantaneous acceleration mathematically.

3. Because there is a change in velocity, there is acceleration
Because there is a change in velocity, there is acceleration. At what point in the graph is the acceleration the greatest? The least?

4. Calculate the acceleration at t = 1 s.
8m/s
= 4 m/s2
2 s

5. Calculate the acceleration at t = 3 s.

6. Because the slopes are not equal, the acceleration is not constant.
Notice how the unit for acceleration is m/s2 . Treat the units as numbers or variables to check your units. 4
8 m/s
8 m s
8 m s 1 x =
8 m
2 s2 2s
2 s 2s

7. This represents the motion of a remote control car
This represents the motion of a remote control car. When is the speed a constant?

8. During which time interval(s) is the train’s acceleration positive?

9. During which time interval(s) is the train’s acceleration most negative?

10. Activity:
Move around the room in groups of 2 or 3. Solve each of the problems on colored papers. Show your work.