2010
t
x
v
=
[average speed = (distance)/(time)]
Velocity is a vector!
Speed is the magnitude of the velocity vector.
(
29
t
x
x
t
x
v
o

=
∆
∆
=
[instantaneous velocity = (change in distance)/(change in time)]
t
v
a
∆
=
[average acceleration = (change in velocity)/(time)]
Acceleration is a vector!
t
v
a
∆
∆
=
[instantaneous acceleration = (change in velocity)/(change in time)]
When given a graph of distance versus time, the slope is the velocity.
When given a graph of velocity versus time, the slope is the acceleration.
Workhorse Equations (for constant acceleration)
t
)
v
v
(
a
o

=
(
29
o
2
o
2
x
x
2
v
v
a


=
t
2
v
v
x
x
o
o
+
+
=
2
o
o
at
t
v
x
x
2
1
+
+
=
2
2
s
ft
32
s
m
8
.
9
g
=
=
θ
=
cos
v
v
x
0
C
Bx
Ax
2
=
+
+
A
2
AC
4
B
B
x
2

±

=
θ
=
sin
v
v
y
a
m
F
=
[Force = (mass)(acceleration)]
2
y
2
x
v
v
v
+
=
Force is a vector!
unit is N = Newton
x
y
v
v
tan
=
θ
Frictional Force is opposite to direction of motion.
In equilibrium, the sum of all forces acting on a body is zero.
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 Spring '08
 Staff
 Physics, Acceleration, Force, Momentum, Qiu PHY

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