Sunday, January 24, 2010

What is my control variable?

i am doing an experiment to see whether a tennis ball bounces higher on tarmac, concrete and grassWhat is my control variable?
The two above answers are both right to a point. How about the energy that is starting the ball in motion? Should that also be a consistent throughout the tests?What is my control variable?
and weather conditions.


wind/air resistance, etc
your control is the tennis ball as u will be using it in every experiment
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