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# To measure the stiffness of steel by the oscillations of a hacksaw blade

Extracts from this document...

Introduction

Peter Ho 12B

To measure the stiffness of steel by the oscillations of a hacksaw blade

Recording raw data

 Mass of magnet, m/g∆m = ±0.1g 51.4 ±0.002 Hacksaw thickness, l/cm∆l = ±0.02cm 0.1±0.2 Hacksaw breadth, l/cm∆l = ±0.1cm 1.0±0.1

X is the distance of the blade between the clamp and the center of magnets M

 X∆l = ±0.

Middle

X

∆l = ±0.100m

Average period T per 20 period, s

0.200

8.7011

0.190

8.051

0.180

7.6009

0.170

7.051

0.160

6.126

0.150

5.751

0.140

5.4009

0.130

4.9009

X

∆l = ±0.100m

Oscillate 1 period, s

0.20

0.44

0.19

0.4

0.18

0.38

0.17

0.35

0.16

0.31

0.15

0.29

0.14

0.27

0.13

0.25

Calculation of average S of oscillate 20 period

(T1+T2+T3+T4)/4

(8.8011+8.6011+8.6011+8.8010)/4

8.7011s

Calculation of Oscillate 1 period when X = 0.20m

(Average period T)/ 20

(8.7011)/20

0.44s

Conclusion

Evaluating procedure

1. If the surface is not horizontal, when measuring the oscillations of a hacksaw blade may get unreliable result.
2. I don’t have enough time to measure the data when X = 0.14 and 0.13m, because I need to find a suitable wood for clamp my hacksaw blade, this may affect my result.

Improving the investigation

1. Use a spirit level to measure the surface to be horizontal
2. I may decrease one trial for reduce the time that I had lost

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