April 16, 2009
PHY 122
TH 9:5011:40
Collisions in Two Dimensions
Hunter Garner
Abstract:
Introduction:
This lab deals with the analysis of two separate collisions of pucks on a frictionless air
table.
One collision will be elastic causing the pucks to bounce off each other and the second is
inelastic so the pucks will stay together after collision.
This is done with the use of Velcro.
The
work energy theorem is used throughout this experiment which states:
+
=
+
K1i K2i
K1f K2f
or
,
+
,
=
,
+
,
12m1v1 i2 12m2v2 i2
12m1v1 f2 12m2v2 f2
Eq. 1
Because the mass is constant in this experiment the equation can be divided by m resulting in:
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,
+
,
=
,
+
,
12v1 i2 12v2 i2
12v1 f2 12v2 f2
Eq. 2
It is through Eq. 2 that the conservation of energy will be tested and analyzed for an elastic
collision.
For an inelastic collision the equation is:
+
=
v1i v2i
vf
Eq. 3
Methods:
In this experiment pucks and an air table were provided to use for the collisions.
In each
experiment one puck began in motion and the other was at rest in the center of the air table.
The
collision of the two pucks was videotaped so that a detailed frame by frame analysis could be
done.
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 Spring '08
 Chamberlin
 Physics, Friction, Frame rate, PUCK, Inelastic collision, Coefficient of restitution

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