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# Motion and Momentum

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## Alize Green

on 25 March 2015

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#### Transcript of Motion and Momentum

Motion and Momentum
Section 2
Terms:
Acceleration: is the change in velocity divided by the time it takes for the change to occur.
Kilogram: SI unit of mass, abbreviated kg; equal to approximately 2.2 lbs
Deceleration: is the decrease of speed of speed or velocity over time
Acceleration and Motion
Average Acceleration:
The average acceleration (a) of any object a given interval of time (t) can be calculated using this equation.

Average Acceleration=
velocity
----------
time
=
v
f
-
v
i
---------
t
Calculating the Average Acceleration:
Positive and Negative Acceleration
a =
formula:
s
f
-
s
i
)
---------
t
=
(6 m/s - 4 m/s)
---------------
5 s
=
+2 m/s
---------
5 s
=
2
(
+0.4 m/s
Graphing Accelerated Motion:
The motion of an object that is moving in a single direction can be shown with a graph.
On a Acceleration-time Graph...
slope is meaningless
the y-intercept equals the initial acceleration
when two curves coincide, the two objects have the same acceleration at the same time
an object undergoing constant acceleration traces a horizontal line
zero slope implies motion with constant acceleration.
-
-
Summary
Acceleration is the change in velocity dived by the time it takes to make the change. Acceleration has direction.
Acceleration occurs whenever an object speeds up, slows down, or changes direction.
On a speed-time graph, a line sloping upward represents increasing speed, a line sloping downward represents decreasing speed, and horizontal line represents zero acceleration or constant speed.
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