PASCO Hooke's Law Set ME-9827 Manual de usuario

Instruction Manual

Manual No. 012-07991B

Hooke’s Law Set

Model No. ME-9827

2®

Table of Contents

Equipment List........................................................... 3

Introduction ............................................................. 4

Equipment Assembly .................................................... 4

Discovering Hooke’s Law ................................................ 5

Sample Results .......................................................... 6

Appendix A: Specifications............................................. 7

Appendix B: Plotting Data in DataStudio.............................. 8

Appendix C: Technical Support ........................................ 9

Appendix D: Copyright and Warranty Information ................... 9

Model No. ME-9827 Hooke’s Law Set

Hooke’s Law Set

Model No. ME-9827

Equipment List

Included Equipment Replacement

Model Number*

1. Hooke’s Law Apparatus (includes all items shown in illustration) ME-9827

2. Base (1), 10.4 cm x 7.5 cm 648-01081

3. Support Arm (1) 648-07989

4. Clamps (2) 648-02023

5. Screws (2), 6-32 x 1/2 610-042

6. Rod (1), stainless steel, 29.3 cm length 648-01080

7. Rod Clamp (1) 648-05132/648-05133

8. Thumb screw with knob, 1/4-20 x 1.0’ 617-019

9. Screws (2), 10-32 x 5/8 610-143

10. Thumb nut , 1/4-20 614-034

11. Transparent Scale Plate (1) 966-07988

12. Stretch Indicator (1) 648-07990

13. Grommet (1) 623-007

14. Eye, swivel (1) 616-148

15. Mass Hanger (1) 648-04857

16. 5 N/m Springs (3) 632-050

17. 8 N/m Springs (3) 632-051

18. 70 N/m Springs (3) 632-052

Additional Equipment Recommended (for experiments) Model Number

Mass and Hanger Set ME-9348

DataStudio®software (for graphing data) CI-6870C

100

ME-9827

HOOKES

LAW

16 17

Hooke’s Law Set

4®

Introduction

PASCO’s ME-9827 Hooke's Law Apparatus allows students to

investigate the relationship between the force applied to a spring and

the amount the spring stretches. Its rugged base and brilliant stretch

indicator will provide years of use in the physics classroom. In

addition, it includes three different springs of varying stiffness. Each

spring has identical length and diameter, but the spring constant varies

between 4 N/m and 96 N/m. Three of each spring type are included for

a total of nine springs.

Equipment Assembly

The stand comes fully assembled, including the transparent scale. To

ready the unit for use, perform the following:

1. Hang the desired spring

from the notch on the

support arm. (Figure 1).

2. Connect the Stretch

Indicator to the bottom of

the spring.

3. Align zero on the sliding

transparent scale with the

Stretch Indicator (Figure 1).

4. Connect a mass hanger

to the bottom of the

Stretch Indicator. To

connect the mass hanger,

unclip the bottom wire

clamp and slide the

clamp through the slit on

the hanger (Figure 2).

The complete setup is

shown on the next page.

ME-9827

HOOKES

LAW

Figure 1

Figure 2

Note: You may need to

adjust the clamp on the

support rod until the

indicator reading falls

at exactly zero. Always

take your reading from

the bottom edge of the

indicator.

Hooke’s Law Set

Experiment: Discovering Hooke's Law

1. Choose the increments of mass to be used in the experiment. Keep the

spring constant in mind when making this choice. The different

springs in the set have spring constants of approximately 4 N/m,

8 N/m, and 96 N/m.

2. Connect the mass hanger to

the bottom of the stretch

indicator and place the first

mass increment on the

hanger. Record the stretch of

the spring and the weight of

the hanging mass. Don't

forget to include the mass of

the hanger.

3. Add five more increments of

mass, each time recording the

stretch of the spring and the

weight of the hanging mass.

4. Repeat steps 2-3 for a

different spring.

5. In DataStudio, create a graph

with “Force” on the vertical

axis and “Stretch” on the

horizontal axis. For more

details, see the instructions in

Appendix B.

6. Using y = mx + b, write an equation for each of the lines. Make

sure to include appropriate variable, numbers, and units in the

equation.

7. The slope of the Force vs. Stretch graph in known as the spring

constant or rate. The vertical intercept represents the amount of

force needed to begin stretching the spring and is also known as the

initial tension. (See “Sample Data” on the next page.)

100

ME-9827

HOOKES

LAW

Figure 3: Setup

CAUTION: Stretching

the spring more than

twice its resting length

can damage the spring.

The maximum allowable

force for each spring is

listed under Specifica-

tions in Appendix A.

Test your mass choice

prior to trying the exper-

iment with students.

Hooke’s Law Set

6®

Sample Data

Hooke’s Law Set

Appendix A: Specifications

Part Specifications

Stretch

Indicator

fluorescent disc, 6.6 cm diameter, acrylic

Spring 5 N/m length (with hooks) = 6.4 cm; diameter = 0.71 cm;

spring constant = 5 N/m

Spring 8 N/m length (with hooks) = 6.4 cm.; diameter = 0.71 cm;

spring constant = 8 N/m

Spring 70 N/m length (with hooks) = 6.4 cm; diameter = 0.71 cm;

spring constant = 70 N/m

Rod stand semi-steel, length = 29.2 cm, diameter = 0.64 cm

Mass hanger mass = 5 grams

Base support 11.4 cm (length) x 7.6 cm (width) x 0.6 cm (height)

Hooke’s Law Set

8®

Appendix B: Plotting Data in DataStudio

The following instructions are provided for new users or those unfamiliar with DataStudio.

The following instructions explain how to create an x-y graph and/or calculate statistics on

previously collected data.

1. Open DataStudio. When the Welcome to DataStudio window opens, select “Enter Data.” An

editable table and Graph display open.

2. On the main toolbar, click the Summary button.

3. In the Data list, double click on the data icon to open the Data Properties dialog.

4. In the Data Properties dialog, do the following:

a) Enter a name for your experiment in the Name box.

b) Click on the X tab and enter the variable name “Stretch” to label the x axis. Enter the

units for stretch (mm or m).

c) Click on the Y tab and enter the variable name “Force” to label the y axis. Enter the

units for force (N). Click OK.

5. In the Editable data table, enter your values for force and stretch. The data values

automatically plot in the graph to the right.

6. On the graph toolbar, click the Curve Fit button and select “Linear Fit.” Slope, intercept,

correlation, and standard deviation values appear in a box on your display.

Hooke’s Law Set

Appendix C: Technical Support

For assistance with the ME-9827 Hooke’s Law Apparatus or any other PASCO products,

contact PASCO as follows:

Address: PASCO scientific

10101 Foothills Blvd.

Roseville, CA 95747-7100

Phone: 1-800-772-8700 or (916) 786-3800

FAX: (916) 786-3292

Web: www.pasco.com

Email: [email protected]

Appendix D: Copyright and Warranty Information

The PASCO scientific 012-07991B Hooke’s Law Apparatus Manual is copyrighted and all

rights reserved. However, permission is granted to non-profit educational institutions for

reproduction of any part of the 012-07991B Hooke’s Law Apparatus 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.

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