Variables/ Swingers

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# Variables - PowerPoint PPT Presentation

Variables/ Swingers. Part 1: Exploring Swingers Part 2: Testing Variables Part 3: Predicting Swings. 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

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## PowerPoint Slideshow about 'Variables' - marin

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Presentation Transcript

### Variables/ Swingers

Part 1: Exploring Swingers

Part 2: Testing Variables

Part 3: Predicting Swings

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