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Variables

Variables. Investigation 1. WD. Lesson Essential Questions. Why is it important to control which variables stay the same and which change? How does a changing variable affect the outcome of the number of swings?. Variables. WD.

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Variables

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  1. Variables Investigation 1

  2. WD Lesson Essential Questions • Why is it important to control which variables stay the same and which change? • How does a changing variable affect the outcome of the number of swings?

  3. Variables WD Journal Entry: Where have you seen a swinger or pendulum action?

  4. Vocabulary WD Variable: anything that you can change in an experiment that might affect the outcome.

  5. WD Vocabulary Pendulum: a mass hanging from a fixed point that is free to swing back and forth.

  6. WD Vocabulary Data Table: Used to organize information gathered in an experiment.

  7. Vocabulary Average: Add numbers together, then divide the numbers by how many there are. Example: 2, 3, 4 2+3+4=9 9/3=3 3 is the average

  8. Examples • Grandfather clocks • Swings • Wrecking ball • metronome

  9. Other pendulums

  10. Procedures • 1. Measure Swinger to be sure it is the right length (38 cm). • 2. Set up data table • 3. Pull swinger back so that it is inline with the table.

  11. 38 cm Trial 1 Trial 2 Trial 3

  12. What do you think??? • What was your groups average # of swings??? • Why do you think the number of swings were so similar for each group? List ideas in your journal.

  13. standard pendulum • 0ne penny, 38 cm long, even with desk

  14. Vocabulary Hypothesis: An educated guess Mass: How much of something there is Control: are like constants in that they stay the same through out an experiment Experiment: an investigation designed to find out how variables affect outcomes. Controlled Experiment: An experiment in which one variable is changed and the outcome is compared to a standard.

  15. Let’s Test it Out (Take 1)! Each group gets a different bob (weight) a. Repeat first experiment. b. Record your data and what conclusion you made based on experiment in your notebook. • Pennies and swing change, was there?

  16. Let’s Test it Out (Take 2)! • Each group starts at a different height. a. Repeat first experiment. b. Record in your notebook your data, and what conclusion you made based on experiment.

  17. Guess What!!! • Mass and release positions do not affect the number of swings of a pendulum. • Length of the pendulum does affect the number of cycles/swings.

  18. Let’s Test it Out (Take 3)! 1. Each group gets a different length of string. a. Repeat first experiment. b. Record in your notebook your data, and what conclusion you made based on experiment. Your chart is going to look different this time!!! Here it is!

  19. Conclusion (SAY WHAT???!!!) • The longer the pendulum, the slower and less swings • The shorter the pendulum the faster and more swings.

  20. More Vocabulary • Graph: can be used to display results. It can be used to find patterns, predict, and locate experimental errors.

  21. Very Important! • Title • Axis • Interval • Label • Spacing

  22. Graph Time!!!

  23. Go back and ANSWER YOUR ESSENTIAL QUESTIONS!!!! • Why is it important to control which variables stay the same and which change? • How does a changing variable affect the outcome of the number of swings?

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