Keeping A Scientific Journal I. Outline of each science project or journal entry (400 points) A. Write a Topic/Title at the top of the page (10) [Page1]

Presentation on theme: "Keeping A Scientific Journal I. Outline of each science project or journal entry (400 points) A. Write a Topic/Title at the top of the page (10) [Page1]"— Presentation transcript:

The Pendulum [Puma Science Lab] [Mr. Buntyn] [Edythe J. Hayes Middle School] [8 th Grade]

The Pendulum [Page 1] Knowledge: Pendulums are used in old clocks, like the grandfather clock. They help us keep with time. We pendulums lose their energy they slow down and must be rewound. Knowledge: Pendulums are used in old clocks, like the grandfather clock. They help us keep with time. We pendulums lose their energy they slow down and must be rewound. Problem: Does the amount of washers or weight of a pendulum affect how many times it will swing in 30 seconds. Problem: Does the amount of washers or weight of a pendulum affect how many times it will swing in 30 seconds. Hypothesis: If I increase the mass of the pendulum, then it will swing fewer times in 30 seconds. Hypothesis: If I increase the mass of the pendulum, then it will swing fewer times in 30 seconds.

Design the Experiment [Page 2] Materials Materials.65 meter of string.65 meter of string 1 Paper clip 1 Paper clip 1 pencil 1 pencil 1 desk 1 desk 2 pieces of masking tape 2 pieces of masking tape 5 metal washers 5 metal washers 2 science books 2 science books

Design the Experiment [Page 2] Procedures Get your materials. Get your materials. Make sure that the paper clip is attached to the end of the string. Make sure that the paper clip is attached to the end of the string. Attach the metal washer to the paper clip. Attach the metal washer to the paper clip. Make sure there is a loop at the top of the pendulum and knot your loop. Make sure there is a loop at the top of the pendulum and knot your loop. Measure the length of the pendulum. It should be approximately 65 centimeters in total length. Record the length of the pendulum in the appropriate place on your chart. Measure the length of the pendulum. It should be approximately 65 centimeters in total length. Record the length of the pendulum in the appropriate place on your chart. Tape the pencil to the edge of the table at the center, with the eraser end of the pencil extending 6 centimeters from the edge of the table? Also tape the pencil at its base for extra support. If not the pencil may sway back and forth with the pendulum. Tape the pencil to the edge of the table at the center, with the eraser end of the pencil extending 6 centimeters from the edge of the table? Also tape the pencil at its base for extra support. If not the pencil may sway back and forth with the pendulum.

Design the Experiment [Page 2] Procedures (continued) Place the loop of the pendulum on the pencil. Make sure that the loop is only touching the wood of the pencil and not the metal or the eraser. Place the loop of the pendulum on the pencil. Make sure that the loop is only touching the wood of the pencil and not the metal or the eraser. Pull the pendulum towards you. Make sure that the release point is horizontal with the pencil. Make sure the tables are even or aligned properly with one another. Pull the pendulum towards you. Make sure that the release point is horizontal with the pencil. Make sure the tables are even or aligned properly with one another. On the release, the timer will begin the stop watch for 30 seconds. If the pendulum strikes the table, continue counting for the full 30 seconds without starting over. On the release, the timer will begin the stop watch for 30 seconds. If the pendulum strikes the table, continue counting for the full 30 seconds without starting over. The counter will count the number of swings. The back and forth movement of the swing is considered to be one swing. The counter will count the number of swings. The back and forth movement of the swing is considered to be one swing. The recorder will record the data in the chart. The recorder will record the data in the chart. Then, add another washer to the pendulum and repeat steps 1-10. Then, add another washer to the pendulum and repeat steps 1-10. Then, add a third washer to the pendulum and repeat steps 1-10. Then, add a third washer to the pendulum and repeat steps 1-10. Repeat the entire experiment 2 more times. Repeat the entire experiment 2 more times. When finished put all materials back in the bag the way that you found them. When finished put all materials back in the bag the way that you found them.

Organizing the Data [Page 3] The Pendulum Constants: Length of the string, type of pencil, same paper clip, science books, point of release, person releasing the pendulum, distance of the pendulum from the table. Number of Swings Number of Washers Trial 1 Trial 2 Trial 3 Average One11181414.33 Three12171514.66 Five14161816

Graphing the Data [Page 4]

Analysis of the Data [Page 5] In trial one, the pendulum swung more times as I increased the number of washers. In trial two, the number of swings decreased as I added more washers to the pendulum. In trial three, the number of swings increased by one swing, at each level, when I added more washers.

Conclusion(Part 1) Pg. 5 My conclusion was supported by my hypothesis. When I averaged the data presented in each level, the pendulum with the most weight swung more times in 30 seconds. Since there wasn’t much of a difference in the number of swings for each washer at each level, I would have to run more trials to be comfortable with my answer.

Conclusion [Page 5] Although I proved my hypothesis to be correct, the data does not convince me that my final answer to the problem is correct. I noticed that as I read the information across the chart, the information collected for the pendulum in all three trials fluctuated and did not stay the same.

Conclusion Pg.5 This means that something was happening in my experiment that I wasn’t aware of. I realized that several hidden variables may have affected my experiment. For example, the pendulum kept hitting the table. I noticed that if I added more weight to the string then the pendulum would be a little longer. In addition to making mistakes, I realized that we made at least one error during this experiment. My partner released the pendulum a few seconds after the time had begun.

Conclusion (Part 2) Other experimental questions might include the following: Does the length of the string affect how many times a pendulum swings in 30 seconds? Does the length of the string affect how many times a pendulum swings in 30 seconds? Does the height of a pendulum affect how many times a pendulum swings in 30 seconds? Does the height of a pendulum affect how many times a pendulum swings in 30 seconds? Does the angle or the release point of a pendulum affect how many times a pendulum swings in 30 seconds? Does the angle or the release point of a pendulum affect how many times a pendulum swings in 30 seconds?

Science Project Complete a Scientific Journal Write Up on the “Great Tomato Race” Complete a Scientific Journal Write Up on the “Great Tomato Race” Read the directions for “Keeping a Scientific Journal” Read the directions for “Keeping a Scientific Journal” Follow these Guidelines for writing up your experiments. Follow these Guidelines for writing up your experiments. This assignment will be due on September 3, 2007. This assignment will be due on September 3, 2007.

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