1. Title

The title should clearly state what the experiment is about. It should be brief but descriptive enough to inform the reader of the experiment's focus.

Example: "Investigation of the Relationship Between Load and Extension of a Spring"

2. Aim/Objective

State the purpose of the experiment in one or two sentences. The aim tells the reader what you intend to investigate or determine.

Example: "To investigate the relationship between the load applied to a spring and its extension."

3. Apparatus and Materials

List all equipment and materials used in the experiment. Be specific about sizes, quantities, and instruments where necessary.

Example:

• Helical spring
• Retort stand, clamp, and boss
• Set of slotted masses (10 g – 100 g)
• Meter rule
• Pointer

4. Theory/Background

Briefly explain the scientific principle or equation relevant to the experiment. This shows understanding of the physics behind the investigation.

Example: "According to Hooke's Law, the extension of a spring is directly proportional to the load applied, provided the elastic limit is not exceeded. The relationship is given by: $F = kx$, where $F$ is the force, $k$ is the spring constant, and $x$ is the extension."

5. Procedure/Method

Describe the steps followed in the experiment in a logical sequence. Use past tense and passive voice. This section must be detailed enough that someone else could replicate the experiment.

Example:

1. The spring was suspended from the retort stand clamp.
2. The initial length of the spring was measured using a meter rule and recorded.
3. A 10 g mass was attached to the spring and the new length was measured.
4. The extension was calculated by subtracting the initial length from the new length.
5. Steps 3 and 4 were repeated for masses of 20 g, 30 g, 40 g, and so on up to 100 g.
6. All readings were recorded in a table.

6. Results

Present all measured and calculated data clearly in a table. Include appropriate headings, units, and significant figures.

Example Table:

Note: Extension is converted to meters for consistency with SI units.

7. Analysis and Discussion

Interpret your results by describing trends shown in the data. If applicable, plot a graph to show the relationship between variables. Discuss whether your results support your hypothesis or aim.

Graph Example: Plot a graph of Force (N) on the y-axis against Extension (m) on the x-axis. If Hooke's Law is obeyed, the graph should be a straight line passing through the origin.

Discussion Points:

• Describe the pattern observed in your data
• Compare your results with expected theoretical values
• Explain any differences or anomalies
• Reference the graph or calculations that support your conclusions

8. Conclusion

State whether the aim of the experiment was achieved. Summarize the main findings in relation to the aim.

Example: "The experiment confirms that the extension of the spring is directly proportional to the load applied, as predicted by Hooke's Law. The spring constant was found to be approximately 4 N/m."

9. Sources of Error

Identify possible factors that may have affected the accuracy of your results and suggest improvements.

Example:

• Systematic error: The meter rule may not have been held vertically when taking readings.
• Random error: Difficulty in reading the pointer position precisely.
• Improvement: Using a fiducial indicator for more accurate reading.

Title: Determination of the Density of a Regular Solid

Aim: To determine the density of a rectangular brass block.

Apparatus: Beam balance, meter rule, brass block

Theory: Density ($\rho$) is mass ($m$) divided by volume ($V$): $\rho = \frac{m}{V}$

Procedure:

1. The mass of the brass block was measured using a beam balance: $m = 150 \text{ g} = 0.150 \text{ kg}$
2. The length, width, and height of the block were measured using a meter rule:
   • Length = 5.0 cm = 0.050 m
   • Width = 2.0 cm = 0.020 m
   • Height = 1.0 cm = 0.010 m
3. Volume was calculated: $V = 5.0 \times 2.0 \times 1.0 = 10 \text{ cm}^3 = 1.0 \times 10^{-5} \text{ m}^3$
4. Density was calculated: $\rho = \frac{0.150}{1.0 \times 10^{-5}} = 15,000 \text{ kg/m}^3$

Results:

• Mass = 0.150 kg
• Volume = $1.0 \times 10^{-5} \text{ m}^3$
• Density = $15,000 \text{ kg/m}^3$

Conclusion: The density of the brass block was found to be $15,000 \text{ kg/m}^3$, which is close to the accepted value for brass ($8,500 \text{ kg/m}^3$). The discrepancy may be due to measurement errors or the block not being pure brass.

• Be organized: Follow the standard structure consistently
• Use proper units: Always include SI units in your results
• Be accurate: Record measurements to the appropriate precision
• Be clear: Write in complete sentences and past tense
• Include relevant data: Only present data that directly addresses the aim
• Be honest: Report errors and limitations in your experiment

In Tanzania, scientific report writing is used in industries such as water quality testing at TANESCO, where technicians document measurements of pH, turbidity, and dissolved oxygen to ensure safe drinking water. Farmers also use simple experimental reports to record soil pH and crop yields, helping agricultural extension officers in regions like Morogoro make evidence-based recommendations for improving harvests.