The student measured the extension for five different forces rather than just measuring the extension for one force. Suggest why.

The student might have measured the extension for five different forces for several reasons:

1. Variability: By measuring the extension for different forces, the student can observe how the extension varies with the force applied. This can help in understanding the relationship between force and extension.

2. Accuracy: Multiple measurements can increase the accuracy of the experiment. If the student only measured the extension for one force, the result could be influenced by an experimental error. By taking multiple measurements, the student can average the results to get a more accurate value.

3. Repeatability: Multiple measurements allow for repeatability and reliability checks. If the same extension is observed for the same force repeatedly, it indicates that the experiment is reliable.

4. Graphical Analysis: Multiple measurements allow for graphical analysis. The student can plot a graph of force against extension, which can provide a visual representation of the relationship between the two variables.

5. Understanding Material Properties: Different materials respond differently to forces. By measuring the extension for different forces, the student can gain insights into the material's properties, such as its elasticity or tensile strength.