L3. Formulating Hypothesis

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


·      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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