Wireless Smart Gate
Assign SmartGate- Smart Gate and Auxiliary Port
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013-16123A
2. Smart Gate and Auxiliary Port - Collision Timer
One of the experiments for “Collision
Timer” is the “Impulse - Collision”
Experiment. In this experiment, a cart
on a slightly inclined track collides with
a force sensor and the impulse during
the collision is recorded. The cart’s
velocity just before the collision and
the velocity just after the collision are
measured by the Wireless Smart Gate.
The mass of the cart and the difference
in velocity (before and after) give the
change in momentum during the
collision. Is the impulse equal to the
change in momentum?
1.
Click or touch “Collision Timer” and then click or touch “OK” to accept the choice and close the dialog.
•
The “Edit Timer Properties” panel
is revealed.The “Flag Length”
default value may need to be
changed.
2.
Measure the length of the “flag” or
the Picket Fence you are using.
Highlight the default value in the
“Edit Timer Properties:” panel and
enter the actual value. Click or touch “OK” to accept the change and close the dialog.
•
The “Select Measurements for Templates” panel
is revealed. The panel shows “Velocity 1” and
“Velocity 2” with “Velocity 1” as the default
choice. This measurement gives the velocity of
the PASCO Cart as calculated based on the Flag
Length and the time from when the Flag blocked
“Detector Port 1” until it blocked “Detector Port
2”. Direction is determined based on which port
was blocked first. The “Velocity 2” measurement is the same and is designed to give the velocity of the cart
after it collides with the force sensor.
3.
Click or touch the box next to “Velocity 2”.
Another experiment for Collision Timer is “Conservation of Momentum” (In an Explosion or a Collision).In an
“Explosion”, two carts, each with a picket fence (such as the ME-9804 Five Pattern Picket Fence) start at rest next
to each other in the middle of a track. Put the plunger of one cart at one of the three positions. Move the carts
together so that the end of the plunger on one cart touches the end of the other cart. Mount the Wireless Smart
Gate near one end of the track. Mount an Accessory Photogate near the other end of the track. Connect the
Accessory Photogate to Auxiliary Port (Port 3) on the Wireless Smart Gate. Start recording data and then release
the plunger so that the carts “explode” away from each other. The total momentum before the explosion is zero.
Use your data to determine whether the momentum is conserved.
Default value -
Change to your value.
Measurements for the Collision Timer