__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 ]

## No comments:

## Post a Comment