Planning an experiment

Question 1

what are the three things you must do when planning an experiment?

Answer 1

-identify variables
-ensure meaningful results
-gather qualitative and quantitative data

Question 2

what is an independent variable?

Answer 2

the variable that is changed on purpose

Question 3

what is a dependent variable?

Answer 3

it is the result of the independent variable
the factor you are measuring

Question 4

what is a controlled variable (usually more than one)

Answer 4

the variables that are kept the same throughout the experiment

Question 5

what are the different variables of this testable question? :
which ball will roll the fastest down a hill, a tennis ball, a ping pong ball or a soccer ball?

independent, dependent and controlled variable

Answer 5

independent (what is changing)
- the type of ball
dependent (what is being measured)
- the speed of the ball
controlled (what is staying the same)
- the surface of the hill and the height at which the balls were dropped