PASCO ME-9486 BALLISTIC CART ACCESSORY - Manual (Page 26)

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Ballistic Cart Accessory 012-05460A
➄ Clamp the pulley on the end of the track. Position the photogate and its bracket over the clamp-on
pulley so it acts as a Smart Pulley. See Figure 9.1.
➅ Tie one end of a 2.2-meter long string to the cart and pass the other end over the pulley and hang
about 200 g on it.
➤
NOTE: the string must be long enough so the cart can reach the end stop furthest from the
pulley. The end stop will mark the position where the cart will be started from rest each time.
➆ Move the cart toward the pulley until the mass just touches the floor. Then place the trip bracket
at the cart’s position. This will cause the cart to drop the ball after the cart has reached its constant
speed. Note that the stiff string will continue to move forward and not bunch up under the cart.
This is the reason for not using thread.
➇ Without hanging the ball on the drop rod, pull the cart back against the end stop and release it
from rest. Record data with the computer and determine the maximum speed, v, of the cart.
cup
floor
end stop
trip bracket
Drop Rod
Accessory
modified
pink ball
x
Figure 9.2: Projectile Motion For Bombing Run.
table
y
end stop