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
Slide 1 - Slide
Slide 2 - Slide
Discussing
the homework
1. Compare your answers with your neighbour
2. Check your answers with the answer sheet.
Slide 3 - Slide
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
Slide 6 - Slide
Learning goals
Calculate acceleration
Define the unit for acceleration
Rearrange the formula for acceleration
Read a speed-time graph correctly
Explain terminal velocity
Slide 7 - Slide
What is
Acceleration?
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Slide 9 - Slide
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=timefinalspeed−startingspeed
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=timefinalspeed−startingspeed
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a=tvf−vi
acceleration=timefinalspeed−startingspeed
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a=tvf−vi
acceleration=timefinalspeed−startingspeed
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
Slide 23 - Slide
Unit of speed
Unit of Acceleration
distance/time
m/s
speed/time
m/s
2
Slide 24 - Slide
Unit of Acceleration
speed/time
(m/s)/s
m/s
2
Slide 25 - Slide
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.
Slide 26 - Slide
Homework
Do: textbook — yellow block exercise 4.4
Do: workbook — exercises 4.4
Slide 27 - Slide
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.
