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Physics
Kinematics & Dynamics
9th
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33 Terms
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1
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Left & down
negative
2
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Right & up
positive
3
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Scalar
Scalars are quantities that take into account amount, not direction
4
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vector
Vectors are quantities that take into account direction
5
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Unit used to describe time
seconds
6
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displacement formula
final position - initial position (xf-xi)
7
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speed
scalar
does not take into account direction
distance/t
8
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velocity
vector
displacement/t
9
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slope
speed
10
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Negatives in physics
opposite way (go by absolute value)
11
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Distance
does not take into account direction—\> scalar
12
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unit for distance and displacement
meters
13
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Displacement
Displacement takes into account the "net" distance traveled, therefore it is a vector quantity.
14
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curved lines are
not lines
not constant slope
changing slope
changing velocity
15
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Constant slope
constant velocity
16
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0 slope below x axis
negative velocity
17
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getting steeper over time (negative way
negative steep velocity
18
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Acceleration
describes an object's change in velocity over a given period of time
meters per second per second
m/s/s
m/s^2
vector
19
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Kinematics
way of describing the motion of objects without describing the causes.
20
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You can describe an object's motion
In words
Mathematically
Pictorially
Graphically
21
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Symbol: t
Variable: Time
Unit: s
22
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Symbol: a
Variable: acceleration
Unit: m/s^2
23
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Symbol: x or y
Variable: Displacement
Unit: m
24
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Symbol: v
variable: final velocity
Unit: m/s
25
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Symbol: Vo
Variable: Initial Velocity
Unit: m/s
26
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Symbol: g
Variable: acceleration due to gravity
Unit: m/s^2
27
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GUESS method
Givens [initial velocity counts as well], Unknown[what we're looking for], Equation, Substitute, Solve.
28
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If velocity and acceleration have the same sign,
the object is speeding up
29
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Kinematic equations
All are used when the acceleration is CONSTANT.
30
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Starting from rest
initial velocity is zero
31
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Coming to a stop
final velocity is zero
32
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V\=Vo+at
no displacement
final velocity
33
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x\=vot+1/2a(t^2)
displacement
no final velocity
can be used to find distance
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