Physics 211
10/30 HW Handout
Due Friday 11/1
Fall 2002
2D Momentum and Energy
1)
A 2kg ball (1) collides with a stationary
ball (2) of the same mass.
Ball 1 moves
off at the angle
θ
1
with velocity v
1,f
after
the collision.
All angles are measured
with respect to the incoming velocity
vector of ball 1.
In all the following
cases, draw a vector that represents the
momentum of ball 2 after the collision
as in the example at right.
Then, using p
1,i
and the x and y components of p
1,f
determine p
2,f
and v
2,f
.
Find both magnitude and direction in each case.
Note:
The momentum vectors are
in the same proportion as the velocity vectors
only
when the masses are the same!
Now take
the results of the previous HW and determine which of the following are elastic and which
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 Fall '08
 LarryWatson
 Physics, Energy, Mass, Momentum, Collision, ball, Inelastic collision, HW Handout 2D

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