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Velocity & Acceleration
Velocity & Acceleration
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Physics
Secondary Education
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Lesson duration is:
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Velocity & Acceleration
Slide 1 - Slide
No, they are not the same thing...
Many people confuse the two.
Velocity is simply the
speed
of an object in a particular direction.
Acceleration is the rate of the
change in velocity
, which means something is either slowing down or speeding up.
Slide 2 - Slide
Slide 3 - Slide
What is Velocity?
Vector quantity
Speed
at which something moves in a particular
direction.
Measures
displacement
Slide 4 - Slide
Velocity Formula
v = velocity
d = distance
t = time
v
=
t
d
Slide 5 - Slide
What is the S.I. Unit for Velocity?
Because:
Unit for distance is m (meters)
Unit for time is s (seconds)
s
m
Slide 6 - Slide
Let's Practice!
A car travels at uniform velocity a distance of 100 m in 4 seconds. What is the velocity of the car?
First step:
Write the equation for velocity
v=
d
t
Slide 7 - Slide
Next, define your variables:
d = 100m
t = 4s
Now you can plug your variables into your equation:
v =
100
4
Slide 8 - Slide
Work out the problem
v =
100
4
v = 25
s
m
Slide 9 - Slide
What is Acceleration?
Vector quantity
The rate at which an object changes its
velocity
over a period of time.
REMEMBER:
Vector quantity
of the
rate
and
direction
of motion. In simpler terms, it is the
speed
at which something moves in one direction.
Slide 10 - Slide
Acceleration Formula
a = acceleration
v = change in velocity (v
^{f}
{final} - v
^{i }
{initial})
t = change in time
(t
^{f }
{final} - t
^{i }
{initial})
Slide 11 - Slide
What is the S.I. Unit for Acceleration?
^{}
^{}
^{(meters per second squared)}
Because:
Unit for velocity is
Unit for time is seconds
^{}
s
m
s
m
2
Slide 12 - Slide
Keep in mind
Subtract initial velocity from final velocity. If you do it in reverse, your acceleration will be incorrect.
If the final velocity is less than the initial velocity, you will have a negative number which means the object slowed down.
If you do not have a starting time, use zero (0).
Slide 13 - Slide
Let's Practice
A delivery truck accelerates from 20
to
40
in 4 seconds. What is its average acceleration?
First, write out your equation
a =
v (f) - v (i)
t (f) - t (i)
s
m
s
m
Slide 14 - Slide
Next, define your variables
v (f) = 40
v (i) = 20
t (f) = 4s
t (i) = 0s
s
m
s
m
Slide 15 - Slide
Plug your variables into the equation
a =
40 - 20
4 - 0
a =
20
4
a = 5
s
m
2
Slide 16 - Slide
CONGRATULATIONS
You have successfully learned about
velocity
&
acceleration
.
Slide 17 - Slide
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