PASCO ME-6810 Time of Flight Accessory - Manual (Page 17)

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Model No. ME-6810 Time of Flight Accessory
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4. The initial velocity should be close to that measured in other
experiments (See manual experiments 1 and 2, for example.)
6. The difference should be less than 5%.
Experiment 3: Horizontal Velocity of a Projectile
Notes on Setup:
3-5. If necessary, consult your interface manual. The system should be
set up in such a way that the computer measures the time between the
Photogate and the timer plate.
6. The “Vertical Target Board” can be any convenient moveable
vertical object.
Notes on Analysis:
The velocity is not constant. It is nearly constant, but this equipment is
sensitive enough to observe the change in velocity due to air
resistance. This air resistance will result in your measured velocity
being slightly lower at longer distances. You may ignore this effect if
you wish, or you may want the students to further investigate the air
resistance.