Classwork: Students investigated the impact of controlling variables while experimenting with changing the steepness of a track and speed of a car.
Homework: None
Discussion Starters: Think of a problem you've had to solve at home, at work or anywhere, when changing only one variable at a time was necessary in order to pinpoint the problem. For example, if a lamp stopped working you might first check the bulb, then the outlet, then the circuit breaker. Discuss the importance of only manipulating one variable at a time.
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