Completing our Experiment

We used the playground for rubber and concrete. We used the carpet in the kirin building. The dirt was in the garden which there is a lot of weed which is near the language building. Also, when we used water, we poured the water into a bucket and we did that in the playground too. When Grace got the bucket from the cleaning lady, me, and Totah was buying food. I bought a small muffin, and Totah bought popcorn. When Totah brang the Popcorn back to class, Mr Fedley said something. Then, everyone in the class laughed. However, I didn’t understand what Mr. Fedley said…

Our Results

As you can see, the average height of:

Rubber- 26

Concrete- 63.7

Dirt- 7.3

Carpet- 61.7

Water- 0

What Our Results Mean

Concrete bounced the most, and water bounced the least. We think concrete bounced the most because concrete is flat and hard the most in the 5 different surfaces. On the other hand, water keeps on wiggling because it isn’t hard. Also the surfaces keeps on moving. That’s why the bouncy ball splash into the water, and won’t come up easily because of the forces. If the water was like a jelly, it would bounce more. I don’t really get why carpet was the second surface that bounced the most because carpet isn’t flat, and hard. Then, I think it would be rubber or dirt the second because it is possible to make it flat, but rubber and dirt was 3rd, and 4th.

Errors in our data

The data isn’t perfectly true because it is only 1 second which the bouncy ball stays at the highest height. Maybe, it can be less than a second. That means, carpet can be the highest surface if we measured it again.

And Our Hypothesis Was….

My hypothesis was:  I think the concrete is the best surface because it is flat, and hard.

This was correct because the conrete was the best surface. We think the reason was also correct because concrete is flat, and hard and the opposite to water. However, I thought rubber was second but it was third. This means it doesn’t mean that surfaces that are flat and hard doesn’t mean that it bounces the most. Even though, this also doesn’t mean it can be the very last because water was 0cm, and there isn’t less than 0cm unless the surface breaks.

And The Rest

For the controlled variable, it was the bouncyball. We chose the bouncyball that bounced the most. The dependent variable was the height. we dropped the bouncyball from 1 meter above. The independent variables were the different surfaces. Water, Carpet, Rubber, Concrete, dirt. If there is one, we should use an machine that can check the height of the bouncyball. If it is impossible, we can video the scenes when we bounce and check the height by attaching the ruler near the spot we bounce.

Moving Force

If we want to expand this experiment, we can choose different kinds of bouncyballs with the same surface, or we can choose flat, and hard surfaces. Also, we can see if the results stay the same of the area of each surface.