Vocabulary - Launching A Rocket
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Vocabulary
STUDENT RESOURCE 4.1
INFORMATION SHEET
controlled variable factor that does not
independent variable factor in an
change in an experiment
experiment that changes
Most experiments have several
By changing only one variable at a
controlled variables. They must stay the
time, and keeping the others the same,
same so that you can be certain which
you can be more sure which variable is
factor is causing the results that you see.
causing your results. Often, scientists
repeat experiments, doing each step
dependent variable factor that is
exactly the same in each test. This helps
measured in an experiment
them to check the accuracy of their
The dependent variable depends on
results.
changes to the independent variable.
For example, if you wanted to see how
Newton’s third law of motion For
the mass of a bottle rocket affects how
every action, there is an equal and
high it can fl y, you would vary the mass
opposite reaction.
of the bottle rocket (the independent
When you jump on a trampoline,
variable). The height of the bottle
you push down on the trampoline. The
rocket’s fl ight however, would be the
trampoline pushes up on you, and you
dependent variable, or the factor that
bounce into the air. Pushing down is the
was measured.
action. Bouncing up is the reaction.
EXPLORING SPACE • SECTION 4 LAUNCHING A ROCKET
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