Observation
Shini and Simon discuss the things to consider when observing a science investigation
The experiment should be conducted in a clear and systematic way to ensure the data is complete and of a high quality.
In an experiment into the relationship between force, mass and acceleration a toy car of different masses runs down a ramp.
The acceleration needs to be measured several times for each mass.
The repeats would all need to be done in the same way and with care to ensure precise data.
If you observe that a repeat is not similar to the others then it is good idea to repeat it.
It is also important to pay careful attention while the experiment is being carried out.
It might be that the car starts to deviate from a straight line path; which if significant may mean that the method should be modified.
Taking accurate measurements
The accuracy of a measurement depends on:
- the quality of the measuring apparatus;
- the skill of the scientist involved.
When using observations to collect data during an experiment it is important to be as accurate as possible. For example, when using a meter rule to measure the length of a spring hanging vertically, it should be read at eye level, not from above or below.