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physics

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  • 1. Test Review Page 296  Definitions of quantities Pg. 320- 323  Question 2 (329) Pg. 354 – 356  Question 3 (358)
  • 2.
    • Slope = y / x
    • Slope = distance / time
    Average Speed = m/s Distance vs. Time graphs
  • 3. Distance vs. Time graphs A car’s Motion
  • 4.  
  • 5.
    • During which interval is the cars average speed the greatest?
    • 0-2 s
    • 2-4 s
    • 4-6 s
    • 6-8 s
    How can you tell?
  • 6.
    • 2. Calculate the average speed of the car from 4s to 6s ?
    • 3. Use the graph and describe the cars motion during the trip
  • 7. Questions about Average Speed
    • Sarah backstrokes at an average speed of 8 m/s , how long will it take her to complete 200 m race?
    • Laurens SUV was found speeding at a 60 km/hr zone. How many km/hr is she travelling over the speed limit if she covered a distance of 10km in 5 minutes?
  • 8. Distance Vs. Time Graph
  • 9. Position vs. Time graphs
    • Slope = y / x
    Av . Velocity= d (change in pos)/ t =m/s (direction)
  • 10. Direction!
  • 11.
    • During which time intervals is the object stationary?
    • 0-2 s
    • 4-6s
    • 6-8 s
    • 8-10s
    How do you know quantitavely?
  • 12.
    • 2. What is the average velocity of the car between 8 s and 10 s?
    • 3. When is the cars average velocity the greatest?
    • 4. Using the graph, describe the cars overall average velocity during its trip
  • 13. Write a description about the motion that graphs might describe
  • 14. Velocity Questions
    • A student walks 2.5 km (E) and then 5.9 km ( S) in 2 hr. Calculate the average velocity
    • 2. A dog runs 1.3 m (N) and turns around and runs 4 m (S) in 20 min. What is the dogs average velocity?
  • 15. Acceleration = a
    •   Accel.= change in velocity / change in time
    • a = v / t
    • (How fast you change how fast you are going!)
    • Vector = Magnitude (size) + Direction
    •   Units: m/s 2
  • 16. Sample Problem
    • A train starts from rest, and accelerates to a final velocity of 500 m/s (E) in a time of 180 s. Calculate the trains acceleration
  • 17. A car travelling at a velocity of 30 m/s (S) encounters an emergency and comes to a stop. How much time will it take for the car to stop if it decelerates at –4.0 m/s 2