Problem
Set 5: Problem 3.
Problem:
Two identical hockey pucks moving with initial speeds
v
A
=
6
5
v
and
v
B
=
v
collide as
shown. The coefficient of restitution of the pucks is
e
. You can ignore the friction of the surface on
which the pucks move.
(a) Determine the velocities of the pucks after impact.
(b) Experimentation shows that Puck A is at rest after the impact when
θ
= 80
.
13
o
, which corresponds
to
cos
θ
= 6
/
35
. Using your result from Part (a), determine the value of
e
.
Solution: (a)
The line of impact for the hockey pucks is the
x
axis. So, there is no need to distinguish
between
nt
and
xy
coordinates.
TangentialVelocity Invariance.
For pucks A and B, we have the following.
v
Ay
=
v
I
Ay
and
v
By
=
v
I
By
The initial velocities of the pucks are such that
v
Ay
= 0
and
v
By
=
v
sin
θ
.
Therefore, the tangential
velocity components after the impact are
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 Spring '06
 Shiflett
 Velocity, hockey, PUCK, identical hockey pucks

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