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# Elastic constant of a spring.

Extracts from this document...

Introduction

Mohamed Osman.

02/05/2007.

14:30

Elastic constant of a spring.

Planning:

1. Introduction: The aim of this experiment is to find and measure the elastic constant of a spiral spring.

(b) Apparatus:

1. Light spiral spring.
2. A scale pan.
3. A meter rule.
4. 2 Clamps and Stands.
5. 2 Boxes of weight.
6. Light pointer for spring.
7. Stop watch.
1. Method:
1. Suspend the light spring from the clamp and attach a light pointer to the spring.
2. Set up a fixed vertical meter rule beside the spring using the clamp and stand.
3. Attach a scale pan to the spring, and then add suitable weights, noting the reading of the pointer each time.
4. Do this for about 8 loads on the scale pan.
5. Then remove each weight, and record the reading of the pointer each time.

Middle

1. Mass of scale pan = 0.05kg
2. Zero reading of spring = 140mm.
 Mass on scale pan(kg) Reading on meter rule(mm) Total mass(kg) Extension(mm) 0.00 140 0.05 0 0.05 159 0.10 19 0.10 179 0.15 39 0.15 198 0.20 58 0.20 215 0.25 75 0.25 235 0.30 95 0.30 254 0.35 114 0.35 274 0.40 134

Conclusion

1. Evaluation:
1. Since I was using plasticine and a pin as a pointer, it was a bit difficult to get a perpendicular horizontal position for the pin to the meter rule.
2. Also when you add weight on to the scale pan, the spring kept oscillating for some time before coming to rest. I ensured that at all time when I was taking my reading that the spring was at rest, and this made my reading accurate.
1. Conclusion:

(i)     =      kg per meter extension is the mass hung on the spring per meter extension.

(ii) Since the graph is a straight line passing through the origin, the extension of the spring is directly proportional to the tension in the spring that is Hooke’s law.

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