This video shows a skateboard going down at ramp at either 21 inches, 14 inches, or 7 inches. While I watched the skateboard in real time I had to make a prediction of what a graph of this would look like. As I watched the skateboard go down in slow motion I would mark actual points on the graphing. After that was done I was able to see how different my prediction was from the actual graph with actual numbers from the video.
1. How close was your prediction to the actual graph? If you're graphs were different then why were they different? What initial reasoning led you to your original graph and why was it different? My prediction was fairly close to the actual graph. The time I estimated and the actual time was slightly off, however the height was somewhat close. The reason I used to make my prediction was to guess where the highest point would be at what time, and to make my prediction around that. It was different because it was a guess, I couldn't make exact predictions from looking at the video one time.
2. What do the zeros of your graph represent? The zeros on my graph represents the skateboard before it goes down the ramp.
3. How do the three graphs compare in terms of zeros, maximums and minimums? What's similar and different and why? The zeros of the three graphs are the same because the time wasn't started until the skateboard was let go of and went down the ramp. The maximums and minimums are at different heights because the skateboard went down the ramp at a different height each time, therefore it would gain more speed and more distance when it goes down the 21 inch ramp, however the 7 inch ramp won't allow the skateboard to gain as much speed.
4. Consider the slopes of the graphs. When is the graph rising the fastest and what does it mean? When is it falling the fastest and what does it mean? The graph is rising the fastest when the skateboard first goes down the ramp, that is when the skateboard has the most speed. The graph is falling the fastest as the skateboard goes backwards, that means that the skateboard was no longer going gaining feet, it was losing ground it had already covered as the time went on.