## Grade 8 Science – Credible Scientist

In my two projects in this unit, there are several things we did well, and some things that aren’t exactly the best.
In both my projects, I had controlled the control variables were controlled relatively well. In both projects, the height was kept relatively consistent throughout the project. However, we didn’t include the failed trials. For example. sometimes the barbie doll didn’t fall straight down and leaned over in one side too much, and the whirlybird sometimes fell on elevated objects and thus created inaccurate data. While we decided to redo the trials, the teacher said that it is best to leave those in and specify what went wrong with this trail.
Some things were simply not controlled well. the barbie doll fell in deferent positions, and that might have skewered the results, and sometime a door opening will send a gust of wind that rendered the trial inaccurate. I have learned that controlling the control variables is very important to being a credible scientist.
control variables aren’t the only thing a credible scientist has to worry about. the Independent variable and the dependent variable are also important too, for example, my whirlybird experiment’s DV is to measure the distance from the drop location. It soon became impractical as it was had to mark the drop location and even harder to measure it accurately under time pressure. Therefore, I only managed to record 3 trials of the same independent variable.
However, many things were controlled well. For example, even though I managed to do only 3 trials of the whirlybird experiment, the values were relatively consistent. (42, 39, 43 cm) therefore, my data can be considered reliable.
Another thing I did well is that my graph was also consistent. Not only were the trials within each independent variable reliable, but the values between each independent variable is also reliable. all my values were close to the trendline. in the bungee Barbee experiment. all values were within 3 cm to what the trendline shows. this further shows my data is reliable.

## Science post-Structures & Forces

How does the natural world affect us?

The natural world can affect us in many ways, wind, temperature and rain can affect how we live, what we eat, what we wear. also, places with frequent natural disasters usually have architecture adapted to survive.

How do we use scientific thinking to learn about the interaction between the natural world and us?

We can definitely use science to our advantage. For example, we can harness different natural sources with power plants. Another way is to prevent natural disasters from being too damaging by using science to help us engineer better structures.

3 How did you use science?

I used science to determine whether the more cardboard I place, the stronger it becomes. This can have real-world applications. For example, in an earthquake-prone area, according to my experiment, having more materials would lessen the chance of the structure to breaking.

How did you improve as a learner?

Firstly, I can now organise data to make it useful.  Secondly, I now know how to find and troubleshoot problems. thirdly, my time management is now much better.