Our goal will be to determine a relationship that describes the motion of a pendulum - specifically, how the time (for a complete swing - the period) depends on particular variables. Ideally, we will have a relationship that has predictive ability - something that we can use to predict the period of any theoretical pendulum.
Think about what variables you would test to find out whether or not a pendulum's period is altered (and how)?
Think also about how many trials you may need to take, the range of values (for example, if we're talking about length - how short to how long?) and how you will represent your data (chart, graph, both?).
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