PASCO ET-8770 Energy-Transfer Friction - Manual (Page 6)

®
Model No. ET-8770 Energy Transfer - Friction
5
Introduction
The Energy Transfer - Friction (ET-8770) apparatus is for
demonstrating frictional heating. With DataStudio software and a
Force and Rotary Motion Sensor, real-time computer measurement of
this frictional work can be observed.
The apparatus includes a friction base, which was specifically
designed for the attachment of a conductive cylinder, thermistor,
Temperature Sensor or ohmmeter, and a Rotary Motion Sensor.
A conductive cylinder with an embedded 10K thermistor fits into a slot
in the friction base. The cylinder is grooved for the placement of a
braided cord, which wraps around the metal cylinder and pulley of a
PASCO Rotary Motion Sensor.
One aluminum and one brass cylinder, each with a 10K thermistor, are
provided with the apparatus to allow the student to compare the
differences between aluminum and brass with frictional heating.
When the braided cord is attached to a Force Sensor and the student
pulls on the cord, friction is created between the cylinder and the cord.
The frictional work done on the metal cylinder causes an increase in
temperature, which is measured in real-time using a Temperature
Sensor.
Equipment Setup
1. Use a C-clamp to fasten the base to the left-front edge of a table.
2. Weigh the cylinder and record its mass. (If the cylinder is already
installed: Remove the cylinder by turning the plastic bolt
counterclockwise.)
3. Insert the plastic bolt into
the cylinder.
4. Place the cylinder next to
the side of the base that
has the hole. Turn the
cylinder, such that the
indented portion is at the
top, with the wires
pointing toward the base of the banana jacks (Figure 1).
5. Turn the bolt clockwise to fasten the cylinder to the apparatus.
Figure 1: Inserting the cylinder
into the Friction Base
bolt
cylinder
banana jacks
thermistor wires