Lesson 9 — 4.4 acceleration & speed-time graphs

Lessonplan
Notes
Topic: 4.4 acceleration and speed time graph
Speed is a change of distance over time.
acceleration is a change of speed over time.

Speed is how fast something moves
looked at formally it becomes — a change of distance over time.
Acceleration is about something speeding up.
Looked at formally it becomes — a change in speed over time.

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4.4
Working on exercises

2 lessons.
Lesson 1: 
Learning goals
  • calculating acceleration
  • Rearranging the formula for acceleration
  • the unit of acceleration
  • reading a speet-time graph
  • Terminal velocity
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Lessonplan
Notes
Topic: 4.4 acceleration and speed time graph
Speed is a change of distance over time.
acceleration is a change of speed over time.

Speed is how fast something moves
looked at formally it becomes — a change of distance over time.
Acceleration is about something speeding up.
Looked at formally it becomes — a change in speed over time.

openen
huiswerk bespreken
4.4
Working on exercises

2 lessons.
Lesson 1: 
Learning goals
  • calculating acceleration
  • Rearranging the formula for acceleration
  • the unit of acceleration
  • reading a speet-time graph
  • Terminal velocity

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Discussing 
the homework

1. Compare your answers with your neighbour
2. Check your answers with the answer sheet.

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Done — Do the exercise below

Maurice cycles at a speed of 5m/s. Over a period of 6 seconds he accelerates to a speed of 8m/s. Calculate his acceleration.

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This lesson
4.4 Acceleration & speed-time graphs


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Learning goals
  • Calculate acceleration
  • Define the unit for acceleration
  • Rearrange the formula for acceleration
  • Read a speed-time graph correctly
  • Explain terminal velocity

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Learning goals
  • Calculate acceleration
  • Define the unit for acceleration
  • Rearrange the formula for acceleration
  • Read a speed-time graph correctly
  • Explain terminal velocity

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What is
Acceleration?

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Exercise

Maurice cycles at a speed of 5m/s. Over a period of 6 seconds he accelerates to a speed of 8/ms. Calculate his acceleration.

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Speed
    • A change in distance over time


    Acceleration
    • A change in speed over time 

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      Speed



        Acceleration
        • A change in speed over time 
          speed=timedistance

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          Speed



            Acceleration
              speed=timedistance
              acceleration=timechangeinspeed

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              Acceleration
                acceleration=timechangeinspeed

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                Acceleration
                  Exercise
                  A race car accelerates from 18.5 m/s to 46.1 m/s in 2.47 seconds. Calculate its change in speed.

                  acceleration=timechangeinspeed

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                  Acceleration
                    acceleration=timefinalspeedstartingspeed
                    Exercise
                    A race car accelerates from 18.5 m/s to 46.1 m/s in 2.47 seconds. Calculate its change in speed.

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                    acceleration=timefinalspeedstartingspeed

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                    a=tvfvi
                    acceleration=timefinalspeedstartingspeed

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                    a=tvfvi
                    acceleration=timefinalspeedstartingspeed
                    • a: acceleration
                    • vf: final speed
                    • vi: initial speed
                    • t: time

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                    The unit of acceleration
                    m/s
                    2

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                    Exercise
                    1)
                    A car pulls up from standing still up to a speed of 22.4 m/s in 2.55s. Calculate its acceleration.

                    2)
                    A roller coaster picks up speed as it rolls down the track. Starting with a speed of 4 m/s it accelerates to 22 m/s in three seconds. Calculate its acceleration.

                    3)
                    why is the unit of acceleration m/s2?

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                    Why is the unit of 

                    acceleration m/s ? 
                    2

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                    Unit of speed
                    Unit of Acceleration
                    • distance/time
                    •  m/s
                    • speed/time
                    •  (m/s)/s

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                    Unit of speed
                    Unit of Acceleration
                    • distance/time
                    •  m/s
                    • speed/time
                    •  m/s
                    2

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                    Unit of Acceleration
                    • speed/time
                    • (m/s)/s


                    m/s
                    2

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                    Exercise
                    A roller coaster picks up speed as it rolls down the track. Starting with a speed of 4 m/s it accelerates to 22 m/s in three seconds. Calculate it's acceleration.

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                    Homework
                    Do: textbook —  yellow block exercise 4.4
                    Do: workbook — exercises 4.4

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                    Homework
                    Do: textbook —  yellow block exercise 4.4
                    Do: workbook — exercises 4.4
                    Done — do the exercise below
                    A feather is dropped on the moon from a height of 1.40 meters. The acceleration of gravity on the moon is 1.67 m/s2. Determine the time it takes for the feather to hit the ground.

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                    a=tvfvi
                    acceleration=timefinalspeedstartingspeed
                    The formula for acceleration

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                    The unit of acceleration
                    m/s
                    2

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                    Learning goals
                    • Calculate acceleration
                    • Define the unit for acceleration
                    • Rearrange the formula for acceleration
                    • Read a speed-time graph correctly
                    • Explain terminal velocity

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                    Homework
                    Do: textbook —  yellow block exercise 4.4
                    Do: workbook — exercises 4.4

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