Physics is what physicists do late at night.

## Tuesday, 25 June 2013

### Hooke's Law Experiment (report)

Students of 4S1 & 4S2 are required to write a report on the Hooke's Law experiment on A4 size papers or test pad. Use a graph paper to plot the graph.

Inference: The force acting on a spring influences its extension.

Hypothesis: The bigger the force acting on the spring,

the bigger is the extension of the spring.

Aim: To investigate the relationship between the force acting on a spring and the extension of the spring.

Variables:   Manipulated variable: Force acting on spring.

Responding variable: Extension of spring

Fixed variables        :  Thickness of spring

Apparatus: Spring, slotted weights, retort stand with 2 clamps, meter rule

Diagram:  (Draw a labeled diagram)

Procedure:

1. The apparatus is set up as shown in the diagram above.

2. A slotted weight of 20 g is hanged onto the spring

to provide the pulling force (F = 0.2 N).

3. The extension of the spring, x, is measured using

the meter rule placed at the side.

4. The experiment is repeated 4 more times by adding a slotted

weight 20 g each time until the total mass is 100 g.

5. The extension of the spring is also measured each time.

6. A graph of extension x (cm) against mass m (gramme) is then plotted.

Results:

 Mass, m (gramme) Extension, x (cm) 5 sets of values 5 sets of values

Analysis:

The graph of extension against mass shows a straight line passing through

the point of origin (0,0).

Conclusion:

(1) The extension of the spring is directly proportional to the mass of slotted weights attached to the spring.

(2) It also means that the extension of the spring is directly proportional to the force acting on the spring.

(3) The hypothesis is accepted.

Precaution:

When adding slotted weights to the spring, do not exceed the elastic

limit of the spring.

Below are samples of x-m graph. Students are to follow their own data. Do not copy other group's data.

The best straight line is supposed to pass through as many points as possible and also the point of origin (0,0). All the graphs show good results except Group: Ng Ray Son.

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