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## PowerPoint Slideshow about 'Variables' - marin

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Part 1: Exploring Swingers

- Pendulum- a mass hanging from a fixed point that is free to swing to and fro (swinger)
- Cycle- motion or activity that repeats itself
- Variable- anything that you can change in an experiment that might affect the outcome of it
- Draw a diagram of a swinger system

Part 1: Exploring Swingers

- Controlling Variables- changing 1 thing at a time in an experiment
- What are pendulum system variables?
- How can I speed up a pendulum system?
- How can I slow down a pendulum system?
- What are the parts of the pendulum system?

Part 1: Exploring Swingers

- Pendulum system variables include the release position, the mass at the end of the pendulum, and the length of the pendulum.
- To speed up a pendulum, you must shorten its’ length.
- To slow down a pendulum, lengthen it.
- Pendulum system parts include the string, the paper clip, the penny, the tape, and the pencil

Part 2: Testing Variables

- Experiment- 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
- Standard- a basic procedure used in an experiment before changing any variables.

Part 2: Testing Variables

- What effect will changing the release position have on the number of swings?
- What effect will adding mass to the pendulum bob have on the number of swings?
- What effect will changing pendulum length have on the number of swings?

Part 2: Testing Variables

- Release position does not affect the number of swings.
- Mass of the bob does not affect the number of swings.
- Pendulum length does affect the number of swings. The longer the pendulum, the fewer swings. The shorter the pendulum, the more swings.

Part 3: Predicting Swings

- Two-coordinate graph- graph that shows the outcome of a series of experiments when a variable is changed by steps
- Prediction- an estimate based on information or experience

Part 3: Predicting Swings

- How can a two- coordinate graph help to determine the value of a variable?
- What can I do to be sure my experiments are accurate?

Part 3: Predicting Swings

- A two- coordinate graph can help to determine the value of a related variable if one of the 2 variables is known
- To be sure my experiments are accurate, I can control all variables that are not being investigated. I can repeat experiments, and I can use small units to record data

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