Lesson 9 — acceleration

4.4 Acceleration

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Lesduur is: 45 min

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4.4 Acceleration

Slide 1 - Tekstslide

This lesson

Recap acceleration
Discussing the homework
Rearranging the formula
Speed-time graphs

Slide 2 - Tekstslide

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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Acceleration

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a c c e l e r a t i o n = \frac{​ f i n a l s p e e d - s t a r t i n g s p e e d ​ ​}{​ t i m e ​}

a = \frac{​ v ^{​ f ​ ​} - v ^{​ i ​ ​} ​ ​}{​ t ​}

a: acceleration
vf: final speed
vi: initial speed
t: time

Slide 5 - Tekstslide

a = \frac{​ v ^{​ f ​ ​} - v ^{​ i ​ ​} ​ ​}{​ t ​}

a: acceleration
vf: final speed
vi: initial speed
t: time

t =

v^{​ f ​ ​} - v^{​ i ​ ​} =

Slide 6 - Tekstslide

a = \frac{​ v ^{​ f ​ ​} - v ^{​ i ​ ​} ​ ​}{​ t ​}

a: acceleration
vf: final speed
vi: initial speed
t: time

t = \frac{​ v ^{​ f ​ ​} - v ^{​ i ​ ​} ​ ​}{​ a ​}

v^{​ f ​ ​} - v^{​ i ​ ​} =

Slide 7 - Tekstslide

a = \frac{​ v ^{​ f ​ ​} - v ^{​ i ​ ​} ​ ​}{​ t ​}

a: acceleration
vf: final speed
vi: initial speed
t: time

t = \frac{​ v ^{​ f ​ ​} - v ^{​ i ​ ​} ​ ​}{​ a ​}

v^{​ f ​ ​} - v^{​ i ​ ​} = a \cdot t

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The unit of Acceleration

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Unit of Acceleration

speed/time
(m/s)/s

m/s

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Practice exercise 1

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

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Practice exercise 2

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.

A) Calculate their change in speed during this acceleration.

B) If They start from rest what is their final speed in this acceleration

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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

Slide 17 - Tekstslide