Transcript Acceleration

Bell Ringer
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Sports announcers will occasionally say that a
person is accelerating if he/she is moving fast.
Why is this not an accurate description of what
acceleration is?
Objectives
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Define acceleration in words and with an
equation
Identify positive and negative acceleration by
analyzing a graph
Calculate acceleration with the use of an
equation and graph
Define and apply the force of gravity
Change in Velocity
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Each time you take a step you
are _________________ the
_____________ of your body.
You are probably most familiar
with the velocity changes of a
moving bus or car.
The rate at which _________
(__________ or __________)
changes occur is called
_______________________.
Acceleration= ________ ______ ________ ______
Change in velocity = final
velocity
–
starting
velocity
Acceleration= __________________________
A car traveling at 60 mph accelerates to
90 mph in 3 seconds. What is the
car’s acceleration?
Acceleration
=
Velocity(final) - Velocity(original)
time
=
=
=
A car traveling at 60 mph slams on the breaks to
avoid hitting a deer. The car comes to a safe stop
6 seconds after applying the breaks. What is the
car’s acceleration?
Acceleration =
Velocity(final) - Velocity(original)
time
=
=
=
- A _________________
acceleration produces a
__________ line or linear
slope (_______________).
- The ________ of a nonlinear velocity-time graph
(rise/run) will predict an
objects instantaneous
____________________.
a=
/
Calculate the instantaneous
acceleration of the graph:
a = v/t
a=
a=
Free fall
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The constant ___________________
of an object moving only under the
force of _______________ is "g".
The acceleration caused by
____________ is _____ m/s2
If there was no _________, all objects
would fall at the same ____________
Doesn’t depend on ____________
After 1 second falling at 10 m/s
After 2 seconds ________ m/s
3 seconds _________ m/s
Galileo
 1600’s
 Studied
how things fell
 Didn’t have a good clock
 Rolled balls down an
_______________ plane
 Found that the
___________ increased
as it rolled __________
the ramp
Galileo
Acceleration= ____________________________
t=0
t = 1 second
t = 2 seconds
t = 3 seconds
Galileo
Same
things happen when things fall
 Didn’t drop things from Tower
of Pisa
Falling
______ resistance will
increase as it falls
______________
 An ________________
force on the object
 Eventually __________
will ______________
with _______ resistance
 Reaches _____________
velocity - highest speed
reached by a falling
object.
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Terminal velocity
 Force
of gravity is constant
air resistance ___________
as you speed up
 until the force is _________
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_____________ forces, no
________________________
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______________ velocity
_______________ velocity
_______________ Velocity and _____________ Acceleration
__________________ Velocity and ______________ Acceleration
_________________ Velocity and ______________ Acceleration
____________________ Velocity and _______________ Acceleration