Lesson 8 — acceleration

4.4 Acceleration
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ScienceMiddelbare schoolhavoLeerjaar 2

This lesson contains 24 slides, with text slides.

time-iconLesson duration is: 45 min

Items in this lesson

4.4 Acceleration

Slide 1 - Slide

This lesson
  •  Recap acceleration
  • Discussing the homework
  • Rearranging the formula
  • Speed-time graphs

Slide 2 - Slide

Learning goals
  • Name the formula for acceleration and apply it in calculations.
  • Be able to rearrange the formula for acceleration.
  • Define the unit of acceleration.
  • Be able to read speed-time graphs

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Recap
  • What is acceleration?
  • Examples of acceleration?
  • How do you calculate acceleration? 

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

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The unit of Acceleration

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


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


m/s
2

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Acceleration
    Exercise
    A dragon fly is flying at a speed of 15,6 m/s. A strong wind pulls up bring its speed down to 12,9 m/s 5 seconds later. Calculate its acceleration.

    a=tvfvi

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    Discussing the homework

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    3. A spaceship is travelling at 20,000.0 m/s. After 5.0 seconds, the rocket thrusters are turned on. At the 55.0 second mark, the ship has a velocity of 24,000.0 m/s. What is the acceleration of the rocket? 

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    3. A spaceship is travelling at 20,000.0 m/s. After 5.0 seconds, the rocket thrusters are turned on. At the 55.0 second mark, the ship has a velocity of 24,000.0 m/s. What is the acceleration of the rocket? 

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    4. The gravitational force on Mars is much lower than the gravitational force on Earth (acceleration due to gravity on Earth accelerates falling objects at 9.8 m/s2). If a dropped hammer’s speed increases from 0.0 m/s to 15.0 m/s in 4.04 s, what is the acceleration due to gravity on Mars? 

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    4. The gravitational force on Mars is much lower than the gravitational force on Earth (acceleration due to gravity on Earth accelerates falling objects at 9.8 m/s2). If a dropped hammer’s speed increases from 0.0 m/s to 15.0 m/s in 4.04 s, what is the acceleration due to gravity on Mars? 

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    Rearranging the formula for acceleration

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    Rearranging the formula
    acceleration=timechangeInspeed
    3=26

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    Rearranging the formula
    A cyclists accelerates at a rate of 1.26 m/s2 for 6.3 seconds. Calculate his change in speed

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    Exercise 1) Elevators in in the Yokohama tower in Japan are among the fastest in the world. They accelerate upwards at a rate of 3.125 m/s2 for 4 seconds. Starting from rest, what is their final speed?

    Exercise 2) A cyclists starts a sprint. he accelerates at a rate of 0.325 m/s2 for 12 seconds. He ends up reaching a speed of 9.7 m/s. Calculate his starting speed.







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    Speed-time graphs

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    Speed-time graphs

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    What type of movement is shown at each part of the graph?
    •  A: Steady acceleration
    • B: Steady speed
    • C Steady acceleration
    • D: increasing acceleration
    • E Decreasing acceleration

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    Homework
    Worksheet acceleration Exercise 5, 6, 7, 8

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    Learning goals
    • Name the formula for acceleration and apply it in calculations.
    • Be able to rearrange the formula for acceleration.
    • Define the unit of acceleration.
    • Be able to read speed-time graphs

    Slide 24 - Slide