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 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

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

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

 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.

 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

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

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

 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

 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?

Scientific notation looks like this. (Positive number = Big number) (Negative number = Small number) 2 * 10 5 which means = * which means = * 10 3 which means = * which means =.001

Race Number Average Speed  What is the average speed of all the races? = /4 = (135)  What is the mean of all the race?  Mean = Average speed

 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