__Lesson 3__

__Question that tests students on how to identify variables and write hypothesis__
The rebound rating is the ratio of the height the ball bounces

*to*, divided by the height the ball was dropped*from*. Use the rebound rating to measure the bounciness of new tennis balls vs. balls that have been used for 10, 20, 50, and 100 games.
(a) State the independent variable

· the number of times the tennis balls have been used

· (e.g. 0, 10, 20, 50, 100 games)

(b) State the dependent variable

· The rebounce ratio

· = height of rebounce / height where tennis ball is dropped

(c) Suggest a hypothesis

· The more times the tennis ball is used, the lower is the rebounce ratio

OR

· The more times the tennis ball is used, the higher is the rebounce ratio

(Note: There are no right or wrong answer but it is just a guess in formulating hypothesis)

[ 3 marks ]

(d) State 3 variables that you should keep constant.

· Height at which the tennis ball is dropped.

· The ball must be dropped vertically downwards.

· There should not be any draft that may cause the falling tennis ball to drift.

[ 3 marks ]

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