Robert Crescenzi
10/12/10
Lab #126
1. Title:
Conservation of Momentum and Impulse Theorum
2. Objective:
To find the impulse of a collision between a glider and a force probe on a frictionless
path.
To gain a better understanding of the ImpulseMomentum theorem.
To deal with both elastic and inelastic collisions
3. Background:
The definition of linear momentum:
p=mv
(where p is linear momentum, m is
mass, and v is velocity.)
Newton’s Law of Linear Momentum states that linear momentum may change only if
there is an external force acting on a system. Collisions between the elements of a system
do not change the total linear momentum of the system. (normal forces acting during the
collision are “internal” forces.)
The definition of impulse (J):
J=Ft
(where J is impulse, F is external force, and t
is time)
External force (F) acting during time (t) does change their linear momentum of the
system by:
Impulse = Change in linear momentum
The definition of elastic collision is:
Sum of Kinetic Energy is constant
The definition of perfectly inelastic collision is:
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View Full DocumentCollision is fully inelastic between any two elements if they “stick” (move with
the same velocity) after the collision.
4. Procedures:
(Part 1: Elastic Collision)
Weigh the gliders without any added mass on them, but include the yokes.
Check to see if the air track is perfectly level before each experiment by observing for
any motion of the gliders.
Set up the two gliders as shown in Figure 1 with the rubber band yokes to be used to
create the elastic collision.
Prepare the gliders as shown in Figure 2, with glider M2 between the photogates and
M1 outside photogate1.
Add an additional 100g of weight to glider M2 and make sure that
collision between the two gliders takes place only while they are both between the gates. (do
a test run, trust me.
..just do it!)
Best results are obtained by measuring the velocities immediately before and after
the collision, not 20 or 30 cm later!! Do not keep the photogates too far from each other.
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 Fall '10
 Universal
 Physics, Force, Friction, Kinetic Energy, Mass, Momentum, Elastic collision

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