Grab a stop watch and take turns with

Grab a stop watch and take turns with your partner. - 5 minutes Find out how long it takes you to walk the width of the space between the lab tables. (window to cabinets) First walk stepping in each tile, use the stopwatch to time yourself. Record your time Next walk stepping in every other tile, record your time. Last tip toe your way across the room. . - record your time. Answer this question as a focus activity on the left side of your notebook: What is the relationship between the distance you walk, the time it takes you to walk, and your walking speed? When you are done get a calculator.

Motion – change in position relative to a reference point Reference Point- place or object used for comparison to determine if something is in motion. Stationary objects such as trees or signs work best.

Speed- rate of motion- The distance an object travels in a certain amount of time. Use SI system D Distance- Meters Time- Seconds Formula : S= D/T Add this to your new formula card Unit- Meters Per Second Velocity= Speed + Direction Ex. 5 m/s North S T

Practice Speed Calculations 1. What is the speed of a man walking 25 m in 15 s? Distance= 25 meters Time= 15 seconds S= 25 m / 15 s S = 1. 67 m/s 2. Armando rode his bike 1, 500 meters to the store. He reached the store in 300 seconds. The store is North of his house. What is Armando’s velocity? 5 m/s North 3. What is the speed of a cheetah that runs 150 m in 5 sec. ? 30 m/s

Let’s mix it up a bit 1. How long will it take a man to walk 180 km, if he walks 3 km/hr? Time ? Distance= 180 km Speed = 3 km/hr Use your triangle!! T= D/S T= 180 km/ 3 km/hr = 60 hours 2. How far will a cyclist go in 4 hours if she is going at a speed of 8 km/hr? Distance? Time= 4 hours Speed= 8 km/hr Use your triangle!! D= S*T D= 8 km/hr * 4 hr = 32 km

Focus Activity- Make a paper air plane –decorate it if you want to… DO NOT THROW IT!!!- 5 minutes Homework: Worksheet Take a Flying High lab at read it over. Wait for instructions.

Average Speed Total Distance( TD) / Total Time (TT) - Add this to your formula card. What was the average speed of a humming bird’s 5 hour migration where it flew 100 m before sunrise, 300 m after stopping to rest and then 100 more meters after sunset? Total Distance= 300 m + 100 m= 500 m Total Time= 5 hours Ave. Speed = 500 m/5 hours = 100 m/hr

Different types of speed Instantaneous speed- The speed at which an object is moving at a particular instant. Constant Speed- Speed doesn’t change ex. Cruise control

Flying High Rules: Act appropriately in the hallway- there are other classes in session. Do not throw your plane when anyone is in the “flying zone” 1 partner will throw at a time, the other partner is using the stopwatch to time your flight. Record your results

Focus Activity: Speed Practice Problems 1. How long will it take a car to travel 420 km going a speed of 60 km/hr? 2. How far will an athlete run in 2 hrs, if he is running at a speed of 9 mi/hr? 3. How long will it take the Concorde SST to travel 14, 400 km at a speed of 3600 km/hr? Homework: Worksheet- Mini quiz on Speed Monday

Average Speed Problems 1. What was the average speed of a car during a road trip to Washington D. C. , where the family drove for 50 miles before stopping for lunch, another 50 before stopping to re-fuel, and then 100 more miles before reaching their destination 4 hours later?

Graphing Speed Distances vs. Time- Time is always on the X axis. Slope = Speed

Interpreting A straight diagonal line represents constant speed A flat line represents no motion The steeper the slope- the faster the speed

Acceleration Rate at which velocity changes. 3 ways an object can accelerate: -change direction – softball being hit by a bat - increase speed – softball being thrown by the pitcher - decrease speed- softball being caught by the catcher

Acceleration Add this to your formula card A= Final Velocity (Vf) – Initial Velocity (VI) Time Unit= Unit for speed per unit of time Km/ Hr 2 or Km/Hr/Sec If unit of time from speed and unit of time are the same “square” it To calculate the average acceleration of the airplane, you must first subtract the initial speed of 0 m/s from the final speed of 40 m/s. Then divide the change in speed by the time, 5 seconds. A= 40 m/s – 0 m/s 5 s A = 8 m/s 2

Graphing Acceleration Speed vs. time straight slanted line = constant acceleration Slope= Acceleration

Or distance vs. time A curved line= acceleration

Focus Activity: Grab a marble lab and read it over with your partner. DO NOT WRITE ON IT!!!!! Homework: 9. 3 Questions Show some Motion Project due 2/17 Keep collecting toilet paper and paper towel rolls- aim for at least 20 each! Enjoy your long weekend!!!!

Marble Motion Lab You will be working in groups of 4. DO NOT LOOSE THE MARBLES!!!!

Focus Activity: Use your formula cards to solve the following acceleration problems. H/W- 10. 1 questions 1. Jeff is driving through the city at 45 mi/hr. The car in front of him slows down. It takes Jeff 10 seconds to slow down to 25 mi/hr. What is his acceleration? Vf – Vi 25 mi/hr – 45 mi/hr = - 2 mi/hr/sec Time 10 sec Josh takes 8 seconds to go from being stopped at a red light to 55 mi/hr. What is his acceleration? Vf – Vi 55 mi/hr – 0 mi/hr = - 6. 89 mi/hr/sec Time 8 sec

Paper Drop Acceleration Focus Activity : Read through the lab. Same groups as the Marble Lab. Get your materials and wait for directions. Homework: Graphing Worksheet