PASCO ME-6694 User Manual

Includes

Teacher's Notes

and

Typical

Experiment Results

Instruction Manual and

012-06339A

Experiment Guide for the PASCO scientific Model ME-6694

TORSION PENDULUM

7/97

10101 Foothills Blvd. • P.O. Box 619011 • Roseville, CA 95678-9011 USA

Phone (916) 786-3800 • FAX (916) 786-8905 • web: www.pasco.com

better

ways to

teach science

Torsion Pendulum 012–06339A

012–06339A Torsion Pendulum

Table of Contents

Section Page

Introduction ...................................................................................................................1

Equipment .....................................................................................................................1

Assembly with the Rotary Motion Sensor ..................................................................23

Suggested Experiment ...................................................................................................4

Experiment

Experiment 1: Determining of the Magnitude of the Moment of Inertia (I) Using

Two Methods .............................................................................. 512

Part A: Determining the Spring Constants of the Wires (κ) ...............68

Part B: Determining the Moment of Inertia (I) of a Disk Using Two

Methods ......................................................................................910

Part C: Determining the Moment of Inertia (I) of a Disk and Cylinder

Using Two Methods ................................................................. 1112

Teachers Notes............................................................ 1316

Technical Support ........................................................................................ Back Cover

PleaseFeel free to duplicate this manual subject to the copyright restrictions below.

The PASCO scientific 012-06339A manual is copyrighted and all rights reserved. However, permission is granted to non-profit educational institutions for reproduction of any part of the Torsion Pendulum manual providing the reproductions are used only for their laboratories and are not sold for profit. Reproduction under any other circumstances, without the written consent of PASCO scientific, is prohibited.

Limited Warranty

PASCO scientific warrants the product to be free from defects in materials and workmanship for a period of one year from the date of shipment to the customer. PASCO will repair or replace at its option any part of the product which is deemed to be defective in material or workmanship. The warranty does not cover damage to the product caused by abuse or improper use. Determination of whether a product failure is the result of a manufacturing defect or improper use by the customer shall be made solely by PASCO scientific. Responsibility for the return of equipment for warranty repair belongs to the customer. Equipment must be properly packed to prevent damage and shipped postage or freight prepaid. (Damage caused by improper packing of the equipment for return shipment will not be covered by the warranty.) Shipping costs for returning the equipment after repair will be paid by PASCO scientific.

Credits

Author: Sunny Bishop

Equipment Return

Should the product have to be returned to PASCO scientific for any reason, notify PASCO scientific by letter, phone, or fax BEFORE returning the product. Upon notification, the return authorization and shipping instructions will be promptly issued.

NOTE: NO EQUIPMENT WILL BE

ACCEPTED FOR RETURN WITHOUT AN AUTHORIZATION FROM PASCO.

When returning equipment for repair, the units must be packed properly. Carriers will not accept responsibility for damage caused by improper packing. To be certain the unit will not be damaged in shipment, observe the following rules:

➀ The packing carton must be strong enough for the

item shipped.

➁ Make certain there are at least two inches of packing

material between any point on the apparatus and the inside walls of the carton.

➂ Make certain that the packing material cannot shift in

the box or become compressed, allowing the instrument come in contact with the packing carton.

Address: PASCO scientific

10101 Foothills Blvd. P.O. Box 619011 Roseville, CA 95678-9011

Phone: (916) 786-3800

FAX: (916) 786-3292

email: techsupp@pasco.com

web: www.pasco.com

012–06339A Torsion Pendulum

Introduction

The PASCO ME-6694 Torsion Pendulum, an accessory for the PASCO CI-6538 Rotary Motion Sensor (RMS), facilitates the study of torque and the moment of inertia in a rotating body. The apparatus uses the data acquisition capabilities of the RMS with Science

Workshop

through the PASCO 500 or 700 computer interfaces. Using the Torsion Pendulum, students can collect experimental data on rotational acceleration, rotational position, and rotational velocity for a variety experiments with the PASCO CI-6691 Mini-Rotational Accessory. Three wires with different diameters supplied with the Torsion Pendulum provide three different and repeatable torque magnitudes.

Equipment

 18-inch wires, 3 each: diameters (inches): 0.032, 0.047, 0.063  upper wire clamp  lower wire clamp

18-inch wires

Additional Equipment Required:

 Science Workshop  PASCO Computer Interface (500 or 700)  computer  Rotary Motion Sensor (CI-6538)  Mini-Rotational Accessory (CI-6691)  Force Sensor (CI-6537)

Additional Equipment Suggested

 Table Clamp (ME-9376B) or Large Rod Stand (ME-8735)  Support Rod (90 cm) (ME-8738)

version 2.1 or higher

upper wire clamp

thumbscrew and washer

lower wire clamp

Safety Note:

Always wear safety glasses when experimenting with the Torsion Pendulum.

Replacement Wires

To order a set of wires, call PASCO (800-772-8700) and order part number 003-06354.

Torsion Pendulum 012–06339A

Note: You will need bend the wires as illustrated in Figure 1. (The direction of the bend is not critical.

Assembly with the Rotary Motion Sensor (RMS)

1. Use the Table Clamp to secure the Support Rod to a table in close

proximity to your computer interface (Figure 2).

RMS

to computer interface

upper wire clamp

wire with bent ends

Figure 1

Bend the ends of the wires to 90° angles.

upper wire clamp

grooves

wire

lower wire clamp

Support Rod

Table Clamp

Figure 2

Assembly of the Torsion Pendulum and the Rotary Motion Sensor

2. Slip the lower wire clamp onto the Support Rod.

3. Clamp the RMS at the top of the Support Rod.

4. Clamp one end of the wire under the washer of the upper wire

clamp by firmly tightening the thumbscrew, being sure to seat the wire in the grooves (Figure 3).

Figure 3

Securing the wire to the upper wire clamp

012–06339A Torsion Pendulum

5. Clamp the other end of the wire under the washer of the lower wire

clamp by tightening the thumbscrew firmly. Be sure that the elbow of the bend in the wire fits snugly against the axle of the thumbscrew (Figures 4a and 4b).

Support Rod

thumbscrew and washer

wire

thumbscrew and washer

lower wire clamp (front view)

wire

lower wire clamp (side view)

Figure 4

Lateral (a) and front (b) views of attaching the bent wire to the lower clamp.

6. Adjust the height of the lower wire clamp

to about 18 inches below the shaft of the RMS.

7. Align the guide of the upper wire clamp

with the slot of the shaft of the RMS. Slide the upper wire clamp onto the shaft (Figure 4).

8. Adjust height of the lower wire clamp as

necessary to position to top of the upper wire clamp approximately half-way up the shaft (Figure 5).

9. If necessary, adjust the lower wire clamp

so the wire is perpendicular to the table.

upper wire clamp

slot

shaft of RMS

guide

10. Recheck all screws on the clamps to be

sure each part is firmly secured.

Support Rod

Figure 5

Sliding the upper wire clamp onto the shaft of the Rotary Motion Sensor

+ 15 hidden pages