1. 13 slides

2.  Dividing total distance by total time calculates average speed.  If the whole trip totaled 30 miles and took 3 minutes to go the 30 miles…..then (30 miles / 3 minutes) = 10 miles/minute

3. Average speed = total miles total time If a car’s average speed is 20 mi/hr, how many miles would it go in 2 hours. (20 mi/hr) = total miles 2 = 6 2 hours 3 20(2) = 40 miles

4. Average speed = total miles total time 30 mi/hr = 90 miles 2 = 6 total time 3 (90 mi) / (30 mi/hr) = 3 hr trip

5.  Velocity is speed plus a direction.  50 mi/hr is speed of a car  50 mi/hr going North is the velocity of a car.

6.  Acceleration is a change in speed or a change in direction.  When you speed up = acceleration  When you slow down = acceleration  When you change direction = acceleration  A carousel is an example of acceleration

7. Average Acceleration = vf – vi time Vf = final velocity Vi = initial velocity (what velocity it starts at)

8. Average Acceleration = vf – vi time A motorcycle travels at 9 m/s. After 2 seconds, the motorcycle is traveling 12 m/s. What is the average acceleration? Average Acceleration = 12 – 9 3 = 1.5 m/s 2 2

9.  You are walking 4 m/s toward the back of a bus traveling 20 m/s forward. Relative to the street your velocity is?  ---------------  20 m/s   4 m/s  (20-4 )= +16 m/s

10.  Kilometers = 1000 meters  1 meter = 100 cm and 1000 mm  1 cm = 10 mm  If it takes Karen 1 hour to drive 40 kilometers to her aunt’s house. What is the distance from Karen’s house to her aunt’s house expressed in meters?

11. Scientific notation looks like this. (Positive number = Big number) (Negative number = Small number) 2 * 10 5 which means = 200000 2 * 10 -5 which means =.00002 1 * 10 3 which means = 1000 1 * 10 -3 which means =.001

12. Race Number Average Speed 1120 2130 3 4160  What is the average speed of all the races? 120 +130+ 130+ 160 = 540 540 /4 = (135)  What is the mean of all the race?  Mean = Average speed

13.  An instance is a brief moment in time.  In an instant you can have a car wreck. In an instant, you can lose your purse. In an instant, you can get in a fight. At an instant as you drive home, you may have to hit your brakes to avoid a skater or slow down for a yield sign. In that instant, you may be going 2 mi/hr, although your average speed for the entire trip was 60 mi/hr. When instantaneous speed never changes = you are going at a constant speed