012–06734A
Smart Timer
19
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EQUIPMENT AND MATERIALS REQUIRED
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The purpose of this experiment is to show that momentum is conserved in collisions.
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When two carts collide with each other, the total momentum
(
p = mv
)
of both carts is
conserved regardless of the type of collision. An elastic collision is one in which the two
carts bounce off of each other with no loss of kinetic energy—accomplished in this
experiment, through the use of the carts’ magnetic bumpers. A completely inelastic collision
is one in which the two carts hit and stick to each other—accomplished in this experiment
using the Velcro patches on one end of each cart.
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PART A: Inelastic Collisions
1.
Level the track by setting a cart on the track to see which way it rolls. Adjust the
leveling screw at the end of the track to raise or lower that end until a cart placed at rest
on the track will not move.
2.
Put a Picket Fence into the slots in the top of each cart and place the Collision Carts so
the Velcro patches face each other. Position the two photogates just far enough apart so
the collision can take place between the photogates. Adjust the height of the photogate
so the 1 cm fence will block the photogate beams. Connect the photogates to the Smart
Timer (see Figure 3.1).
Figure 3.1
Experiment setup for
Conservation of Momentum experiments
Photogate 2
Photogate 1
to channel 2
of the Smart
Timer
to channel 1
of the Smart
Timer
1 cm flag
Adjustable
End Stop
photogate brackets
leveling
foot
1 cm flag
Summary of Contents for ME-8930
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