1. Conclusion Writing How do we write a “good” scientific conclusion in science?

2. Why do we need to be able to do this? Accountability Closer to society Writing is a skill Proving the facts “If an excellent experiment is summarized by a weak conclusion, the results will not be taken seriously.”

3. Purpose What is the question that you are trying to answer? Q: How do we measure time accurately using the photogates? Examples: In today’s lab I was investigating how to measure time accurately using the photogates. In today’s lab I was trying to understand how the photogates measure time. In today’s lab, I was trying to find the relationship between the two photogates and how they work together to measure time.

4. Hypothesis What did you think would happen. Normally, you will write an “If…then…” statement. Examples: I thought that the photogates would start when you enter one and stop when you exit the other. In this experiment, we predicted that time T ab would begin and end when going through T a and T b. Through this experiment, I thought that T a would start the T ab time and T b would stop the T ab time.

5. Results Do you support or refute your hypothesis? NO PROVING! MUST state this in your own conclusion Do you have quantitative data to support your findings? Numbers, calculations, formulas This lab did NOT have any of this information, but you do need to describe how you support or refute your hypothesis. EVIDENCE! What does this mean? What was the relationship? Time measurement Stopwatch vs. Photogates

6. Results Example: I found out how the photogates work. The time for T a starts once I enter photogate A and break the beam. This also starts the time for T ab. Then, once exiting T a the time stops for photogate A. The time for T b starts once I enter photogate B and break the beam. The time also stops for T ab as soon as I break the T b beam. This is the relationship between photogate A and B. This lab was looking at ways to measure time accurately. Reaction time with a stop watch showed me that that is not such a great way to measure time accurately. The time it takes to stop a stop watch would leave a lot of room for error.

7. Application How does this lab apply to your real-world OR a real-world situation? Stop and think about time measurement What about the photogates? Example: Using the photogates, I know that time could be measured better in track and field. We could use them to time when a runner starts and stops more accurately. Using the photogates we could really improve the way in which we measured the Hoppity Hop. We only had hand-held stop watches which is not as accurate.

8. Conclusion In today’s lab I was trying to understand how the photogates measure time. In this experiment, we predicted that time T ab would begin and end when going through T a and T b. I refute my hypothesis. I found out how the photogates work. The time for T a starts once I enter photogate A and break the beam. This also starts the time for T ab. Then, once exiting T a the time stops for photogate A. The time for T b starts once I enter photogate B and break the beam. The time also stops for T ab as soon as I break the T b beam. This is the relationship between photogate A and B. This lab was looking at ways to measure time accurately. Reaction time with a stop watch showed me that that is not such a great way to measure time accurately. The time it takes to stop a stop watch would leave a lot of room for error. Using the photogates we could really improve the way in which we measured the Hoppity Hop. We only had hand-held stop watches which is not as accurate.