PASCO ME-8930 SMART TIMER - Manual (Page 6)

Smart Timer 012–06734A
2
In One Gate Mode, a single photogate lets you measure the time, velocity, or acceleration
of a fence as it passes through the photogate. Two photogates are used for collision
experiments using one or two carts or for experiments where the velocity of a cart must be
measured at two different points. In Two Gate Mode, two photogates are used and the
time to travel between the two can be measured. This mode can also be used to measure
time of flight using the ME-6810 Time-of-Flight Accessory.
Use with the Smart Pulley:
For rotary motion studies, the ME-9387 Smart Pulley (available separately) is ideal. It
combines a photogate with a pulley, and when used with the Smart Timer, allows direct
measurement of angular speed and acceleration. When used with a string connected to a
glide or Dynamics Cart, the Smart Timer and Smart Pulley can be used to determine
linear acceleration (cm/s 2 ) as well.
➤ Note: The use of pulleys with different diameters and/or different number of spokes
than the Smart Pulley or the ME-9450 Super Pulley will give incorrect results in the speed
and acceleration calculations.
Power Options:
The Photogate Timer can be powered using the included 9VDC adapter. It will also run
on 4-AA size, 1.5 volt alkaline batteries which will provide over 100 hours of operation in
typical use.
Experiments:
Four copy-ready experiments and 9 additional suggested experiments are included in this
manual, showing a variety of ways to use the Smart Timer. The equipment requirements
vary for different experiments. For many of the experiments, you will need a Dynamics
Track and Dynamics Carts. Some experiments also require two ME-9204B Accessory
Photogates or the ME-9387 Smart Pulley. Check the equipment requirements listed at the
beginning of each experiment.