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 - Tekstslide
Slide 2 - Tekstslide
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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What is
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=timefinalspeed−startingspeed
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a=tvf−vi=tΔv
acceleration=timefinalspeed−startingspeed
( change) in speed)
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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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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
1)
A car pulls up from standing still up to a speed of 22.4 m/s in 2.55s. Calculate its acceleration.
Answer: 8,78 m/s2
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?
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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. Answer 0,5 m/s2
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a=tvf−vi
acceleration=timefinalspeed−startingspeed
The formula for acceleration
Slide 21 - Tekstslide
The unit of acceleration
m/s
2
Slide 22 - Tekstslide
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. Answer 11,17 m/s2