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Do Now

Do Now. 1. Put these objects in order from slowest to fastest: Peregrine falcon Cheetah Ms. Lusk Car (at the highway speed limit) Mako shark Ocean wave Maglev train. Do Now Answers. Put these objects in order from slowest to fastest: Peregrine falcon (#6, 200 mph)

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Do Now

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  1. Do Now 1. Put these objects in order from slowest to fastest: • Peregrine falcon • Cheetah • Ms. Lusk • Car (at the highway speed limit) • Mako shark • Ocean wave • Maglev train

  2. Do Now Answers Put these objects in order from slowest to fastest: • Peregrine falcon (#6, 200 mph) • Cheetah (#5, 70 mph) • Ms. Lusk (#7, 351 mph: JK #2, 28 mph) • Car (at the highway speed limit) (#4, 60 mph) • Mako shark (#3, 31 mph) • Ocean wave (#1, 4.5 mph) • Maglev train (#7, 350 mph)

  3. Announcements • Quiz over motion, speed, and velocity on Monday. • Lab tomorrow • Parent Lab Night: A week from today • If you need another invitation, please see Ms.Lusk • PLEASE come. It’ll be fun 

  4. Speed, Distance, and Time

  5. What is speed? • Speed is a measure of how fast something moves or the distance it moves, in a given amount of time.

  6. How do we calculate speed? • To calculate speed, we have to use a formula. • Speed=Distance divided by Time

  7. Formulas Speed speed = distance time s = d t *speed of a car is mph = miles = distance hour time

  8. Speed Triangle • To help us solve speed problems, we can use a speed triangle like the one below. D ÷ S T x

  9. How do we use this? • Step 1: Draw a triangle on your paper. • Step 2: Write in the numbers that you know from the problem. • MAKE SURE THEY ARE IN THE CORRECT PLACE! • Step 3: Use your finger to cover the section of the triangle that you are solving. • If one number is on top of the other, divide. • If two numbers are next to each other, multiply.

  10. 4. Distance = 10 metersTime = 1 sec.Speed = S 10 m ÷ S 1 s x

  11. What other formulas can we make from our speed formula?

  12. Distance Formula Distance s = d t d = s x t x t x t

  13. Formulas Time d = s x t t = d s ÷ s ÷ s

  14. Checking for Understanding • What is speed? • What is the formula for calculating speed?

  15. Ex1: A football field is about 100 m long. If it takes a person 20 seconds to run its length, how fast were they running? Example #1

  16. Steps to solving equation Step one: Identify your distance and your time. D= 100 m T= 20 sec Step two: Place numbers into the triangle. Step three: Solve for distance. 100 m ÷ 20 s S x

  17. Ex 2: If you drive at 100 km/hr for 6 hours, how far will you go? Solve in your notebook ÷ 100 km/hr * 6 hours= 600 km D 6 hours 100 km/hr x

  18. Every summer I drive to Michigan. It is 3900 km to get there. If I average 100 km/hr, how much time will I spend driving? Example #3 ÷ 3900 km ÷ 100 km/hr= 39 hours 3900 km T 100 km/hr x

  19. Ex4: If you run at 12 m/s for 15 minutes, how far will you go? Example #4

  20. Average Speed • Speed is not constant. • Ms.Lusk and a half marathon • To calculate average speed find the distance traveled, and then divide by the sum of the times.

  21. Example #5 • An excellent middle school runner might have the following times for the four laps of the 1600-meter race: 83 seconds, 81 seconds, 79 seconds, and 77 seconds. • Step One: Identify the distance traveled. • D=16oo m • Step Two: Add up the seconds it took to complete. • T= 320 sec • Step Three: Place into equation • S = 1600 m • 320 sec • Step four: Solve equation • 5.0 m/sec

  22. On your own • A ball is thrown a total of 18 meters in 3 seconds. What is the average speed of the ball?

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