A brief dynamic event consisting of the close approach of two or more particles, such
as atoms, resulting in an abrupt change of momentum or exchange of energy.(
http://www.thefreedictionary.com/collision)
•
Vector:
A quantity, such as velocity, completely specified by a magnitude and a direction.(
http://www.thefreedictionary.com/vector)
•
Dimple:
to mark (a metal object) with a drill point as a guidefor further drilling.
(dictionary.com)
•
Percent error
: The approximation error in some data is the discrepancy between an exact value
and some approximation to it. An approximation error can occur because #the measurement of the
data is not precise (due to the instruments), or #approximations are used instead of the real data.
(
en.wikipedia.org/wiki/Percent_error
)
•
Plumb bob
: A lead weight attached to a string. It is the tool used in determining plumb.
(
www.allaspectsinspections.com/definitions.php
)
Data:
(look at attached excel sheet)
Analysis:
(look at attached excel sheet)
Results and Conclusion:
This lab was executed to help the students know and understand the law of
conservation of momentum through collisions in two dimensions and analyzing them. Our final results
were .82% difference between
s
and
s
1
+s
2
and 5.65% difference between 90° and Θ
1
and Θ
2
. Possible
discrepancies of our experiment would be the location of where the ball started every time, marking where
the plumb bob hit the paper wrong, measuring (
s
) wrong, weighing the balls wrong, placement of our X in
the center of the circle, wrong calculations and measurement of angles.
Questions: Under the Report section:
1. Why?
S
B
has to be reduced by a factor of 1/3.3 because of the ratio
so since
S
B
is th measurement of where the
shallow ball dropped so in order to stay in proportion with this ratio we need to reduce it by a factor of
1/3.3.
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 Fall '11
 BrunoBauer
 Physics, Momentum, Collision, ball, plumb bob

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