# Lesson 6 — 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
• 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
• Terminal velocity

#### Slide 2 -Tekstslide

This lesson
4.4 Acceleration & speed-time graphs

#### Slide 3 -Tekstslide

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

What is
Acceleration?

#### Slide 6 -Tekstslide

Speed
• A change in distance  over time

Acceleration
• A change in speed over time

#### Slide 7 -Tekstslide

Speed

Acceleration
• A change in speed over time
speed=timedistance

#### Slide 8 -Tekstslide

Speed

Acceleration
speed=timedistance
acceleration=timechangeinspeed

#### Slide 9 -Tekstslide

Acceleration
acceleration=timechangeinspeed

#### Slide 10 -Tekstslide

acceleration=timefinalspeedstartingspeed

#### Slide 11 -Tekstslide

a=tvfvi=tΔv
acceleration=timefinalspeedstartingspeed
( change) in speed)

#### Slide 12 -Tekstslide

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

#### Slide 13 -Tekstslide

The unit of acceleration
m/s
2

#### Slide 14 -Tekstslide

Why is the unit of

acceleration m/s ?
2

#### Slide 15 -Tekstslide

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

#### Slide 16 -Tekstslide

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

#### Slide 17 -Tekstslide

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

m/s
2

#### Slide 18 -Tekstslide

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. Answer 6 m/s2

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

#### Slide 19 -Tekstslide

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. Answer 0,5 m/s2

#### Slide 20 -Tekstslide

a=tvfvi
acceleration=timefinalspeedstartingspeed
The formula for acceleration

#### Slide 21 -Tekstslide

The unit of acceleration
m/s
2

#### Slide 22 -Tekstslide

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. Answer 11,17 m/s2

#### Slide 23 -Tekstslide

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

#### Slide 24 -Tekstslide

Homework
Make worksheet 4.4