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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