PASCO ME-9341 INTRODUCTORY ROTATIONAL APPARATUS - Manual (Page 11)

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012-03051F Introductory Rotational Apparatus
4. PENDULUM MODE—If the rotational speed is
too great to record the times as they are displayed,
use a single cardboard piece, as in Figure 5, and set
the photogate to pendulum mode. The timer will
display the time for two full revolutions of the plat-
ter, allowing one revolution time for reading and
recording the value.
5. Alternative Methods
• Use the PASCO Model AI-6577A Apple Com-
patible Photogate System. This system offers
many of the same advantages as Smart Pulley
timing. However, since it was not designed spe-
cifically for the Rotational Apparatus, experi-
ments will have to be adapted somewhat.
Five Copy-Ready Experiments
The following five experiments are written in worksheet form.
Feel free to photocopy them for use in your lab.
➤ NOTE: For more information about each of these
labs, including relevant equations and suggested
alternatives, see the LAB NOTES section, near the end
of this manual.
Some precautions will help keep your data as accurate as
possible:
➀ Before conducting any experiment, always level the base as
accurately as possible.
➁ When using a thread to apply a torque to the platter, keep the
thread as parallel to the platter as possible.
➂ When measuring the radius of a tier of the step pulley, use
calipers to measure the diameter, then divide by two.