What is the unit of acceleration. Explain your answer
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acceleration=timefinalspeed−startingspeed
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a=tvf−vi
acceleration=timefinalspeed−startingspeed
Or
a=
Δv
÷t
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a=tvf−vi
acceleration=timefinalspeed−startingspeed
a: acceleration
vf: final speed
vi: initial speed
t: time
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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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Rearranging the formula for speed
a=tvf−vi
3=26
is the same as v = a.t
is the same as
Δ
a=Δtv
(vf−vi)=a⋅t
t=a(vf−vi)
t=Δav
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Speed-time graphs
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Speed-time graphs
The area under the curve = De travelled distance.
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Speed-time graphs
area A=12 Area B=30 Area C= 9
d= 51 m
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The area under the graph
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The area under the graph
Area under graph = 64
d=64 m
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Terminal velocity
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Constant speed. travelling the same distance each second. Constant slope
(x,t)-diagram
(v,t)-diagram
Constant speed. travelling the same distance each second. Constant slope
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Deccelerating (slowing down) travelling lesser distance each second. Graph is becoming less steep=. Slope is decreasing
(x,t)-diagram
(v,t)-diagram
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Accelerating ( speeding up). Travelling more distance each second. Graph is becoming more steep = slope is increasing.
(x,t)-diagram
(v,t)-diagram
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Exercise
Mike goes for a run. At the start of his run he runs at a speed of 7 m/s. 25 seconds later he runs at a speed of 4 m/s. Calculate his acceleration. Answer
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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? Vf= 12,5 m/s
A cyclists cycles at a speed of 5/ms. He accelerates at a rate of 1.26 m/s2 for 6.3 seconds. Calculate his final speed. vf= 12,94 m/s
